USPTO Examiner LEFF ANGELA MARIE DITRAN - Art Unit 3674

Recent Applications

Detailed information about the 100 most recent patent applications.

Application NumberTitleFiling DateDisposal DateDispositionTime (months)Office ActionsRestrictionsInterviewAppeal
19068505IN-SITU COMPOSITE POLYMERIC STRUCTURES FOR FAR-FIELD DIVERSION DURING HYDRAULIC FRACTURINGMarch 2025January 2026Allow1120YesNo
18953826METHOD OF USING NON-MAGNETIC SOLID TRACERSNovember 2024March 2026Allow1510YesNo
18919005COOLING FOR GEOTHERMAL WELL DRILLINGOctober 2024February 2026Allow1610NoNo
18911321HYDROGEN SULFIDE TREATMENT METHOD FOR CRUDE OIL/SOUR GASOctober 2024June 2025Allow900YesNo
18897603OIL DISPLACEMENT METHOD FOR AN ULTRA-HIGH WATER-CUT RESERVOIRSeptember 2024February 2026Allow1610NoNo
18886189EMULSIONS CONTAINING WATER-SOLUBLE ACID RETARDING AGENTS AND METHODS OF MAKING AND USINGSeptember 2024December 2025Allow1521YesNo
18811351Method of Preparing Drilling Mud Through Integrating Ultrasonic Mixing and Venturi TechnologyAugust 2024October 2025Allow1410NoNo
18800795WELLBORE FLUIDS INCLUDING EMULSIFIERS, AND RELATED METHODSAugust 2024December 2025Allow1611NoNo
18792012EFFERVESCENT TABLET FOR ENHANCED OIL RECOVERY AND ENHANCED OIL RECOVERY METHOD USING THE SAMEAugust 2024January 2025Allow610NoNo
18763303REMOVING HYDROGEN SULFIDE FROM SUBTERRANEAN GEOLOGICAL FORMATION WITH A COPPER MAGNESIUM IRON LAYERED TRIPLE HYDROXIDE ZEOLITE MATERIAL IN A WATER-BASED DRILLING FLUIDJuly 2024September 2024Allow210NoNo
18759148TREATMENT OF SUBTERRANEAN FORMATIONSJune 2024December 2025Allow1820NoNo
18718446A POLYHALITE COMPOSITION AND METHOD FOR ENHANCED RECOVERY OF OILJune 2024April 2025Allow1010NoNo
18675698HYDRAULIC FRACTURING PROCESSES FOR SEQUENTIALLY INTRODUCING DIFFERRING PROPPANT-CONTAINING FRACTURING FLUIDS INTO SUBTERRANEAN FORMATIONSMay 2024March 2026Allow2220YesNo
18664028TIME DEPENDENT TRACER RELEASE IN STIMULATED GAS WELLS USING COMPOSITE PARTICLES MADE OF TWO DIFFERENT THERMOPLASTIC POLYESTER BLENDS OF VARIOUS RATIOSMay 2024November 2025Allow1821NoNo
18650499EFFERVESCENT TABLET FOR ENHANCED OIL RECOVERY AND ENHANCED OIL RECOVERY METHOD USING THE SAMEApril 2024August 2024Allow401YesNo
18648003METHOD OF REMOVING HYDROGEN SULFIDE FROM A SUBTERRANEAN GEOLOGICAL FORMATION WITH AN IMIDAZOLATE-BASED NANOMATERIAL IN AN OIL-BASED DRILLING FLUIDApril 2024January 2025Allow910NoNo
18704346METHOD OF MEASURING CARBON DIOXIDE SEQUESTRATIONApril 2024October 2025Allow1810YesNo
18635495Polymers and Nanoparticles for FloodingApril 2024June 2025Allow1420NoNo
18631829METHODS FOR CEMENTING WELLBORES UTILIZING SPACER FLUIDS THAT INCLUDE SURFACTANT PACKAGESApril 2024September 2025Allow1820YesNo
18629410DRILLING FLUID ADDITIVES FOR HIGH-DENSITY RESERVOIR DRILLING FLUIDSApril 2024May 2025Allow1311YesNo
18626253METHOD FOR GENERATING CO2 IN SITU FOR OILFIELD APPLICATIONS USING PROPYLENE CARBONATEApril 2024January 2026Allow2231YesNo
18623159IN-SITU COMPOSITE POLYMERIC STRUCTURES FOR FAR-FIELD DIVERSION DURING HYDRAULIC FRACTURINGApril 2024November 2024Allow810NoNo
18619731CARBON DIOXIDE MINERALIZATION AND STORAGEMarch 2024October 2025Allow1940YesNo
18620446METHOD FOR STABILIZING WELLBORE, STABILIZED WELLBORE AND WELLBORE STABILIZING FLUIDMarch 2024October 2025Allow1820YesNo
18620285METHODS AND COMPOSITIONS USED IN CONTROLLING FORMATION SAND PRODUCTION, PROPPANT FLOWBACK, AND FINES MIGRATIONMarch 2024February 2026Abandon2221YesNo
18616362METHOD FOR CONSOLIDATING SAND IN HYDROCARBON RESERVOIRSMarch 2024May 2025Allow1420NoNo
18596472CARBON DIOXIDE MINERALIZATION AND STORAGEMarch 2024July 2025Allow1620YesNo
18588998Remediating Failed Isolation in Plug-and-Perforation OperationsFebruary 2024June 2025Allow1510NoNo
18425863SYSTEM AND METHOD FOR GENERATING HYDROGEN AND ENHANCING WELLBORE INJECTIVITY AND HYDROCARBON RECOVERYJanuary 2024March 2025Allow1410NoNo
18393277METHOD FOR INCREASING CRUDE OIL PRODUCTION BY CO2 STORAGE IN AQUIFER AND DUMPFLOODINGDecember 2023February 2025Abandon1420YesNo
18393361METHODS FOR MICROBIAL GAS PRODUCTION AND USE AS ISOTOPIC TRACERDecember 2023June 2025Allow1820YesNo
18572225PROCESSES FOR INJECTION OF FLUIDS INTO A WELLBORE VIA DRILL PIPEDecember 2023September 2025Allow2130YesNo
18543002MIXTURE FOR PRE-CEMENTING OPERATION IN WELLBOREDecember 2023October 2025Allow2230YesNo
18515803Enhanced Carbon Sequestration via Foam CementingNovember 2023March 2026Allow2740YesNo
18508715SUPER HYDROPHOBIC 2D NANOSHEET MATERIALS FOR IMPROVED OIL RECOVERYNovember 2023March 2025Abandon1601NoNo
18502412FLOWBACK AID FOR FRACTURING FLUIDSNovember 2023May 2025Allow1820YesNo
18496760ENVIRONMENTALLY FRIENDLY NANOSHALE INHIBITOR IN AQUEOUS-BASED WELLBORE FLUIDSOctober 2023December 2025Abandon2631YesNo
18287874COMPOSITIONS AND METHODS FOR THE DISSOLUTION OF IRON SULFIDEOctober 2023March 2026Allow2831NoNo
18490507QUANTIFYING ZONAL FLOW IN MULTI-LATERAL WELLS VIA TAGGANTS OF FLUIDSOctober 2023January 2025Allow1520YesNo
18490356FRAC FLUIDS FOR FAR FIELD DIVERSIONOctober 2023June 2025Abandon1910NoNo
18373322FORMULATION FOR INHIBITING WATER PERMEATION IN AN EXTRACTION WELL OF A HYDROCARBON FLUID FROM AN UNDERGROUND RESERVOIRSeptember 2023December 2024Allow1521YesNo
18471784LOST CIRCULATION COMPOSITE MATERIALS AND METHODS AND SYSTEMS RELATED THERETOSeptember 2023October 2025Allow2531NoNo
18470882ACID STIMULATION METHODSSeptember 2023November 2025Allow2630NoNo
18550444ISOCYANATE-AMINE-BASED CHEMICAL ANCHOR WITH IMPROVED STORAGE STABILITY, AND USE THEREOFSeptember 2023January 2026Abandon2910NoNo
18465212ACIDIZING COMPOSITIONS FOR IMPROVED FLUID PERFORMANCESeptember 2023December 2025Allow2731YesNo
18461578TREATMENT OF SUBTERRANEAN FORMATIONSSeptember 2023November 2025Allow2631NoNo
18459139EUTECTIC METAL ALLOY-CONTAINING CEMENT AND METHODS OF USE THEREOFAugust 2023July 2025Allow2231YesNo
18240161SCALE INHIBITOR SQUEEZE TREATMENTAugust 2023May 2025Abandon2121NoNo
18456461EUTECTIC METAL ALLOY IN DRILLING FLUIDS AND METHODS OF USE THEREOFAugust 2023June 2025Allow2231YesNo
18234318COMPOSITIONS AND METHODS FOR CARBON DIOXIDE SOLIDIFICATIONAugust 2023May 2025Allow2111NoNo
18366541SHALE INHIBITORS AND SYSTEMS AND METHODS RELATED THERETOAugust 2023September 2025Abandon2540NoNo
18228351SILICA NANOPARTICLES FOR CRUDE OIL RECOVERY USING CARBON DIOXIDE, AND CRUDE OIL RECOVERY METHODJuly 2023March 2025Allow2030YesNo
18352214STRUCTURAL STABILIZER FOR FIBER AND CONVENTIONAL PROPPANT COMPLEX IN EFFICIENT PROPPANT MIGRATION AND PLACEMENT TECHNOLOGY OF FRACTURED WELL AND PREPARATION METHODJuly 2023October 2023Allow410YesNo
18221698Use of Zirconium Salts as Scale Inhibitor Squeeze EnhancersJuly 2023August 2025Allow2530YesNo
18350469SURFACTANT MIXTURES FOR ENHANCED OIL RECOVERYJuly 2023April 2025Allow2121YesNo
18220576POLYMER COMPOSITIONS AND FRACTURING FLUIDS MADE THEREFROM INCLUDING A MIXTURE OF CATIONIC AND ANIONIC HYDRATABLE POLYMERS AND METHODS FOR MAKING AND USING SAMEJuly 2023February 2026Abandon3140NoNo
18344743METHOD TO USE LOSS CIRCULATION MATERIAL COMPOSITION COMPRISING ACIDIC NANOPARTICLE-BASED DISPERSION AND FORMATE BASED ACTIVATOR IN DOWNHOLE CONDITIONSJune 2023March 2026Abandon3241YesNo
18343887ENHANCED CO2 FRACKING OPERATIONJune 2023January 2025Allow1920NoNo
18342417Quantifying Zonal Flow in Multi-lateral Wells via Taggants of FluidsJune 2023February 2026Allow3240YesNo
18341493Integrated Wellsite System and Method for In-situ CO2 Gas Capture, Carbonation and SequestrationJune 2023October 2024Allow1610NoNo
18340694METHOD AND APPARATUS FOR DOWNHOLE IN-SITU MIXING USING DUAL, CONCENTRIC FLOW CHANNELSJune 2023August 2024Allow1311NoNo
18213737DRILLING FLUID WITH SELF-ADJUSTED ALKALINITYJune 2023November 2025Allow2941YesNo
18339922REDUCED-POLYMER-LOADING, HIGH-TEMPERATURE FRACTURING FLUIDS AND METHODS AND SYSTEMS RELATED THERETOJune 2023September 2024Allow1511YesNo
18338244IN-SITU OIL UPGRADING VIA DEASPHALTINGJune 2023June 2025Abandon2420NoNo
18330873ANHYDROUS AMMONIA STIMULATION PROCESSJune 2023December 2023Allow610NoNo
18203608DIALKYL AND CYCLIC CARBONATE-DERIVED SOLVENT FORMULATIONS FOR CHEMICAL APPLICATIONS IN MITIGATING CONDENSATE BANKINGMay 2023March 2026Abandon3441YesNo
18144705SYSTEM AND METHOD FOR CARBON DIOXIDE STORAGE AND GEOTHERMAL HEAT MINING IN DEPLETED GAS, GAS CONDENSATE OR OIL RESERVOIRSMay 2023April 2025Allow2440YesNo
18032217Control of Lost Circulation Through a Thermally Activated Metallic AdditiveApril 2023October 2025Allow3031NoNo
18131329High Density Brine Internal PhaseApril 2023June 2024Allow1410YesNo
18182235QUANTIFYING ZONAL FLOW IN MULTI-LATERAL WELLS VIA TAGGANTS OF FLUIDSMarch 2023July 2024Allow1710NoNo
18180878METHOD FOR STABILIZING CO2 MICROBUBBLE BY INJECTING NANOPARTICLES TO ENHANCE GEOLOGICAL STORAGEMarch 2023May 2024Allow1420NoNo
18160710PH CONTROL IN FLUID TREATMENTJanuary 2023September 2024Allow2020NoNo
18004777ALKALINE EARTH METAL MINERALS AS CARRIERS FOR SURFACTANTS IN DRILLING FLUIDSJanuary 2023February 2025Allow2530YesNo
18091232Ionic Liquid Chain Transfer Agent As Well Treatment AdditiveDecember 2022April 2025Allow2831YesNo
18146831FRAC FLUIDS FOR FAR FIELD DIVERSIONDecember 2022July 2023Allow710NoNo
18146851FRAC FLUIDS FOR FAR FIELD DIVERSIONDecember 2022May 2025Abandon2840YesNo
18089470Engineered Nano-Modified Methyl Methacrylate Polymer for Repair of 30 microM MicrocracksDecember 2022February 2025Abandon2620NoNo
18065408POLYMERIC RED MUD-BASED KILLING FLUID AND USES THEREOFDecember 2022June 2024Allow1821NoNo
18078552Hydrated Metal Carbonate For Carbon Capture And Underground StorageDecember 2022August 2025Allow3360YesNo
18061353SAND CONSOLIDATION BY ENZYME MEDIATED CALCIUM CARBONATE PRECIPITATIONDecember 2022January 2024Allow1420NoNo
18056465DRILL-IN FLUIDS USING CALCIUM CARBONATE PARTICLES FORMED FROM SEQUESTERED CARBON DIOXIDENovember 2022October 2024Abandon2321YesNo
17980972Method of Removing Non-Aqueous Drilling Mud with Banana Containing FluidNovember 2022February 2024Allow1510NoNo
17978538Method of Enhancing Foam Stability for Stimulation of Low Pressure ReservoirsNovember 2022October 2025Allow3641NoNo
18049304OPTIMIZING STEAM AND SOLVENT INJECTION TIMING IN OIL PRODUCTIONOctober 2022May 2024Allow1910NoNo
17970782GEOPOLYMER CEMENT COMPOSITIONS AND METHODS OF USEOctober 2022April 2023Allow620YesNo
17962700FLUID SYSTEMS FOR EXPANDING SHAPE MEMORY POLYMERS AND REMOVING WATER-BASED FILTER CAKESOctober 2022December 2023Allow1410YesNo
17937655METHOD AND SYSTEMS FOR SUBSURFACE CARBON CAPTUREOctober 2022June 2024Allow2020NoNo
17957912WELL CONDITIONING METHOD FOR WIRELINE LOGGING USING DEDICATED AQUEOUS BASED DRILLING FLUID COMPOSITIONSeptember 2022August 2024Allow2320YesNo
17907400DIVERTER ACID FLUID COMPOSITION FOR THE STIMULATION OF RESERVOIRS BY MATRIX ACIDIFICATIONSeptember 2022February 2025Allow2830YesNo
17906931METHOD FOR LEVELING THE INJECTIVITY PROFILE OF AN INJECTION WELLSeptember 2022August 2024Allow2320YesNo
17940813STORABLE LIQUID SUSPENSION OF HOLLOW PARTICLESSeptember 2022August 2023Allow3511YesNo
17903620WET-AIR OXIDATION OF KEROGEN IN SUBTERRANEAN FORMATIONSSeptember 2022June 2024Allow2221YesNo
17929587HYDROPHIBIC CARBON-DOTS FOR OIL TRACERSSeptember 2022September 2025Abandon3741YesNo
17893813ETHER AND CARBON DIOXIDE MIXTURES TO ENHANCE HYDROCARBON RECOVERY FROM AN UNDERGROUND FORMATIONAugust 2022November 2024Abandon2620NoNo
17817193STEAM-ENHANCED HYDROCARBON RECOVERY USING HYDROGEN SULFIDE-SORBENT PARTICLES TO REDUCE HYDROGEN SULFIDE PRODUCTION FROM A SUBTERRANEAN RESERVOIRAugust 2022July 2024Allow2420YesNo
17877901COMPOSITION AND METHODS FOR ENHANCING THE PRODUCTION OF HYDROCARBONSJuly 2022November 2023Allow1520YesNo
17815648QUATERNIZED ALKOXYLATED POLYMER SURFACTANTJuly 2022June 2024Abandon2320YesNo
17873863CALCINED SAUDI CALCIUM BENTONITE AS CEMENT REPLACEMENT IN LOW-DENSITY OIL-WELL CEMENT SYSTEMJuly 2022September 2023Allow1310YesNo
17871622SUBSTITUTED AMINE ACID SALT ACTIVATION OF FURFURYL ALCOHOL-BASED RESINSJuly 2022September 2023Allow1411YesNo
17813359FLOW CONTROL IN SUBTERRANEAN WELLSJuly 2022August 2023Allow1320NoNo

Appeals Overview

This analysis examines appeal outcomes and the strategic value of filing appeals for examiner LEFF, ANGELA MARIE DITRAN.

Patent Trial and Appeal Board (PTAB) Decisions

Total PTAB Decisions
22
Examiner Affirmed
12
(54.5%)
Examiner Reversed
10
(45.5%)
Reversal Percentile
68.1%
Higher than average

What This Means

With a 45.5% reversal rate, the PTAB reverses the examiner's rejections in a meaningful percentage of cases. This reversal rate is above the USPTO average, indicating that appeals have better success here than typical.

Strategic Value of Filing an Appeal

Total Appeal Filings
51
Allowed After Appeal Filing
16
(31.4%)
Not Allowed After Appeal Filing
35
(68.6%)
Filing Benefit Percentile
48.1%
Lower than average

Understanding Appeal Filing Strategy

Filing a Notice of Appeal can sometimes lead to allowance even before the appeal is fully briefed or decided by the PTAB. This occurs when the examiner or their supervisor reconsiders the rejection during the mandatory appeal conference (MPEP § 1207.01) after the appeal is filed.

In this dataset, 31.4% of applications that filed an appeal were subsequently allowed. This appeal filing benefit rate is below the USPTO average, suggesting that filing an appeal has limited effectiveness in prompting favorable reconsideration.

Strategic Recommendations

Appeals to PTAB show good success rates. If you have a strong case on the merits, consider fully prosecuting the appeal to a Board decision.

Filing a Notice of Appeal shows limited benefit. Consider other strategies like interviews or amendments before appealing.

Examiner LEFF, ANGELA MARIE DITRAN - Prosecution Strategy Guide

Executive Summary

Examiner LEFF, ANGELA MARIE DITRAN works in Art Unit 3674 and has examined 607 patent applications in our dataset. With an allowance rate of 69.5%, this examiner has a below-average tendency to allow applications. Applications typically reach final disposition in approximately 30 months.

Allowance Patterns

Examiner LEFF, ANGELA MARIE DITRAN's allowance rate of 69.5% places them in the 31% percentile among all USPTO examiners. This examiner has a below-average tendency to allow applications.

Office Action Patterns

On average, applications examined by LEFF, ANGELA MARIE DITRAN receive 3.20 office actions before reaching final disposition. This places the examiner in the 90% percentile for office actions issued. This examiner issues more office actions than most examiners, which may indicate thorough examination or difficulty in reaching agreement with applicants.

Prosecution Timeline

The median time to disposition (half-life) for applications examined by LEFF, ANGELA MARIE DITRAN is 30 months. This places the examiner in the 62% percentile for prosecution speed. Prosecution timelines are slightly faster than average with this examiner.

Interview Effectiveness

Conducting an examiner interview provides a +28.6% benefit to allowance rate for applications examined by LEFF, ANGELA MARIE DITRAN. This interview benefit is in the 76% percentile among all examiners. Recommendation: Interviews are highly effective with this examiner and should be strongly considered as a prosecution strategy. Per MPEP § 713.10, interviews are available at any time before the Notice of Allowance is mailed or jurisdiction transfers to the PTAB.

Request for Continued Examination (RCE) Effectiveness

When applicants file an RCE with this examiner, 16.2% of applications are subsequently allowed. This success rate is in the 13% percentile among all examiners. Strategic Insight: RCEs show lower effectiveness with this examiner compared to others. Consider whether a continuation application might be more strategic, especially if you need to add new matter or significantly broaden claims.

After-Final Amendment Practice

This examiner enters after-final amendments leading to allowance in 28.1% of cases where such amendments are filed. This entry rate is in the 40% percentile among all examiners. Strategic Recommendation: This examiner shows below-average receptiveness to after-final amendments. You may need to file an RCE or appeal rather than relying on after-final amendment entry.

Pre-Appeal Conference Effectiveness

When applicants request a pre-appeal conference (PAC) with this examiner, 23.5% result in withdrawal of the rejection or reopening of prosecution. This success rate is in the 28% percentile among all examiners. Note: Pre-appeal conferences show below-average success with this examiner. Consider whether your arguments are strong enough to warrant a PAC request.

Appeal Withdrawal and Reconsideration

This examiner withdraws rejections or reopens prosecution in 58.5% of appeals filed. This is in the 33% percentile among all examiners. Of these withdrawals, 19.4% occur early in the appeal process (after Notice of Appeal but before Appeal Brief). Strategic Insight: This examiner shows below-average willingness to reconsider rejections during appeals. Be prepared to fully prosecute appeals if filed.

Petition Practice

When applicants file petitions regarding this examiner's actions, 53.5% are granted (fully or in part). This grant rate is in the 54% percentile among all examiners. Strategic Note: Petitions show above-average success regarding this examiner's actions. Petitionable matters include restriction requirements (MPEP § 1002.02(c)(2)) and various procedural issues.

Examiner Cooperation and Flexibility

Examiner's Amendments: This examiner makes examiner's amendments in 0.3% of allowed cases (in the 56% percentile). This examiner makes examiner's amendments more often than average to place applications in condition for allowance (MPEP § 1302.04).

Quayle Actions: This examiner issues Ex Parte Quayle actions in 0.9% of allowed cases (in the 60% percentile). This examiner issues Quayle actions more often than average when claims are allowable but formal matters remain (MPEP § 714.14).

Prosecution Strategy Recommendations

Based on the statistical analysis of this examiner's prosecution patterns, here are tailored strategic recommendations:

  • Expect multiple rounds of prosecution: This examiner issues more office actions than average. Address potential issues proactively in your initial response and consider requesting an interview early in prosecution.
  • Prioritize examiner interviews: Interviews are highly effective with this examiner. Request an interview after the first office action to clarify issues and potentially expedite allowance.

Relevant MPEP Sections for Prosecution Strategy

  • MPEP § 713.10: Examiner interviews - available before Notice of Allowance or transfer to PTAB
  • MPEP § 714.12: After-final amendments - may be entered "under justifiable circumstances"
  • MPEP § 1002.02(c): Petitionable matters to Technology Center Director
  • MPEP § 1004: Actions requiring primary examiner signature (allowances, final rejections, examiner's answers)
  • MPEP § 1207.01: Appeal conferences - mandatory for all appeals
  • MPEP § 1214.07: Reopening prosecution after appeal

Important Disclaimer

Not Legal Advice: The information provided in this report is for informational purposes only and does not constitute legal advice. You should consult with a qualified patent attorney or agent for advice specific to your situation.

No Guarantees: We do not provide any guarantees as to the accuracy, completeness, or timeliness of the statistics presented above. Patent prosecution statistics are derived from publicly available USPTO data and are subject to data quality limitations, processing errors, and changes in USPTO practices over time.

Limitation of Liability: Under no circumstances will IronCrow AI be liable for any outcome, decision, or action resulting from your reliance on the statistics, analysis, or recommendations presented in this report. Past prosecution patterns do not guarantee future results.

Use at Your Own Risk: While we strive to provide accurate and useful prosecution statistics, you should independently verify any information that is material to your prosecution strategy and use your professional judgment in all patent prosecution matters.