USPTO Examiner CHENG KAREN - Art Unit 1623

Recent Applications

Detailed information about the 100 most recent patent applications.

Application NumberTitleFiling DateDisposal DateDispositionTime (months)Office ActionsRestrictionsInterviewAppeal
18741022HETEROARYL-THIO-SUBSTITUTED PYRONESJune 2024August 2025Allow1411YesNo
18678198COMPOUNDS AND COMPOSITIONS AS INHIBITORS OF ENDOSOMAL TOLL-LIKE RECEPTORSMay 2024October 2025Abandon1701NoNo
18529117SALTS AND CRYSTAL FORMS OF GABA-A POSITIVE ALLOSTERIC MODULATORDecember 2023May 2025Allow1710NoNo
18385766COMPOSITIONS AND DOSAGE FORMS FOR TREATMENT OF HPV INFECTION AND HPV-INDUCED NEOPLASIAOctober 2023December 2024Allow1320YesNo
18385778TREATMENT OF HPV-INDUCED NEOPLASIAOctober 2023January 2025Abandon1511NoNo
18267416PHOSPHORUS COMPOUNDS AND METHODS THEREOFJune 2023February 2026Allow3201NoNo
18033114CIS-PARA-SUBSTITUTED CYCLOHEXYLAMINONITRILE SALT, PREPARATION METHOD THEREFOR AND USE THEREOF, AND METHOD FOR PREPARING PESTICIDE USING SAMEApril 2023February 2026Allow3301YesNo
18301025ASGPR CELL SURFACE RECEPTOR BINDING COMPOUNDS AND CONJUGATESApril 2023December 2024Allow2030YesNo
18029962SOLID STATE FORMS OF RESMETIROMApril 2023January 2026Allow3301NoNo
18116557OXYSTEROLS AND METHODS OF USE THEREOFMarch 2023June 2024Allow1611NoNo
18043740PESTICIDALLY ACTIVE HETEROCYCLIC DERIVATIVES WITH SULFUR CONTAINING SUBSTITUENTSMarch 2023December 2025Allow3310NoNo
18041880Novel ruthenium complexes, methods of their preparation and application thereof in olefin cross metathesisFebruary 2023February 2026Allow3620YesNo
18019070PROCESS FOR PREPARATION OF MESOTRIONE AND ITS INTERMEDIATESJanuary 2023August 2025Allow3000YesNo
18018822COLD MEDICINE AND ANTIVIRAL MEDICINEJanuary 2023February 2026Allow3711YesNo
18007370METHOD FOR PRODUCING 2-(HALOGENATED METHYL)NAPHTHALENE AND 2-NAPHTHYL ACETONITRILEJanuary 2023December 2025Allow3420YesNo
18002037THYROMIMETICSDecember 2022September 2025Allow3311YesNo
18054921METHODS FOR PREPARING A BORON DIPYRROMETHENE (BODIPY) DERIVATIVE AND APPLICATIONS THEREOFNovember 2022January 2025Allow2611NoNo
17922140METHOD FOR PREPARING BRIVARACETAM AND INTERMEDIATE THEREOFOctober 2022October 2025Allow3610NoNo
17996321Benzimidazole derivativesOctober 2022December 2025Abandon3810YesNo
17964489PYRROLO[2,1-F][1,2,4]TRIAZINES AND PREPARATION AND USES THEREOFOctober 2022May 2024Allow1921YesNo
17929597GPX4 INHIBITORS, PHARMACEUTICAL COMPOSITIONS THEREOF, AND THEIR USE FOR TREATING GPX4-MEDIATED DISEASESSeptember 2022August 2025Allow3520YesNo
17802994HYDROBORATION-OXIDATION PROCESSAugust 2022December 2025Allow4010NoNo
17887289NUCLEOTIDE ANALOGS AND USES THEREOFAugust 2022August 2025Allow3601NoNo
17788284ICAN DERIVATIVES FOR ANTIFUNGAL USEJune 2022January 2026Abandon4301NoNo
17783287CANNABINOID DERIVATIVESJune 2022January 2026Abandon4401NoNo
17780344METHOD FOR PRODUCING MAXACALCITOL, AND INTERMEDIATE THEREFORMay 2022March 2025Allow3410YesNo
17780465NOVEL THYROMIMETICSMay 2022April 2025Allow3510NoNo
17779678LOBINALINE N-OXIDES AS POSITIVE ALLOSTERIC MODULATORS OF THE DOPAMINE TRANSPORTER WITH POTENTIAL VALUE IN THE TREATMENT OF SUBSTANCE ABUSE DISORDERSMay 2022May 2025Allow3500YesNo
17755983MATRIX METALLOPROTEINASE (MMP) INHIBITORS AND METHODS OF USE THEREOFMay 2022November 2025Allow4220YesNo
17775985NOVEL SUBSTITUTED 6- MEMBERED HETEROARYL PIPERIDINYL ETHANONESMay 2022July 2025Allow3810NoNo
17773171LOCAL ANESTHETICS WITH SELECTIVE-SENSORY NERVE BLOCKADEApril 2022June 2025Allow3811YesNo
17773349CINNAMIC AMIDE DERIVATIVE HAVING FXR ACTIVATING EFFECT, PHARMACEUTICAL COMPOSITION CONTAINING THE SAME AS ACTIVE INGREDIENT, AND METHOD FOR PREPARING THE SAMEApril 2022October 2025Allow4111NoNo
17770690BICYCLIC COMPOUNDS AND METHODS FOR THEIR USE IN TREATING PITT HOPKINS SYNDROMEApril 2022June 2025Allow3810YesNo
17770681NICOTINAMIDE COMPOUND AND HERBICIDAL COMPOSITION COMPRISING COMPOUNDApril 2022October 2025Allow4211NoNo
17770502ANALOGUES OF N-ACYL-HOMOSERINE LACTONES AND PHARMACEUTICAL COMPOSITION COMPRISING SAMEApril 2022May 2025Abandon3701NoNo
17770242AGENT FOR PROMOTING ODONTOBLAST PROPAGATION AND DIFFERENTIATIONApril 2022September 2025Abandon4110NoNo
17761984CARBONATE CONTAINING LIPID COMPOUNDS AND COMPOSITIONS FOR INTRACELLULAR DELIVERY OF THERAPEUTIC AGENTSMarch 2022December 2025Allow4501YesNo
17761273THIAZOLE CARBOXAMIDE COMPOUNDS AND USE THEREOF FOR THE TREATMENT OF MYCOBACTERIAL INFECTIONSMarch 2022September 2025Abandon4210NoNo
17636788USE OF A NEUTROPHIL ELASTASE INHIBITOR IN LUNG DISEASEFebruary 2022March 2026Abandon4801NoNo
17635710SALTFebruary 2022February 2026Abandon4811NoNo
17632751NEO-BAVAISOFLAVONE AND COMPOSITIONS THEREOF AND THEIR USE AS PESTICIDESFebruary 2022November 2025Abandon4510NoNo
17630105HETEROARYL-SUBSTITUTED PYRAZOLO-PYRIDINE PROTEIN KINASE INHIBITORS FOR PROMOTING LIVER REGENERATION OR REDUCING OR PREVENTING HEPATOCYTE DEATHJanuary 2022February 2026Allow4910NoNo
17581178SELECTIVE DIHYDROPYRROLOPYRIMIDINE JAK2 INHIBITORSJanuary 2022June 2025Allow4010NoNo
17578624MATERIAL FOR FORMING ORGANIC FILM, SUBSTRATE FOR MANUFACTURING SEMICONDUCTOR DEVICE, METHOD FOR FORMING ORGANIC FILM, PATTERNING PROCESS, AND COMPOUND FOR FORMING ORGANIC FILMJanuary 2022January 2026Allow4811YesNo
17627831HERBICIDAL COMPOUNDSJanuary 2022June 2025Allow4110NoNo
17627857COMBINATION THERAPY FOR CANCER TREATMENTJanuary 2022October 2025Abandon4501NoNo
17627530SUBSTITUTED PYRIDAZINONES AS HERBICIDESJanuary 2022June 2025Allow4110YesNo
17623461SYNTHESIS OF CHOLESTEROL AND VITAMIN D3 FROM PHYTOSTEROLSDecember 2021January 2026Allow4911YesNo
17562976HYDRAZONE AMIDE DERIVATIVE AND APPLICATION THEREOF IN PREPARATION OF MEDICAMENTS FOR PREVENTING AND TREATING ALOPECIADecember 2021August 2025Allow4411YesNo
17561055ANDROGEN RECEPTOR BINDING MOLECULE AND USE THEREOFDecember 2021July 2024Allow3120YesNo
17621075IMPROVED, COST EFFECTIVE PROCESS FOR SYNTHESIS OF VITAMIN D3 AND ITS ANALOGUE CALCIFEDIOL FROM ERGOSTEROLDecember 2021January 2026Allow4911YesNo
17544303CYCLIN DEPENDENT KINASE INHIBITORSDecember 2021March 2025Allow3901NoNo
17614797COMPOUND FOR INHIBITING RORyt ACTIVITY, PREPARATION METHOD THEREFOR AND APPLICATION THEREOFNovember 2021April 2025Abandon4101NoNo
17595820FUSED HETEROCYCLIC DERIVATIVESNovember 2021April 2025Allow4111NoNo
17611540NATRIURETIC PEPTIDE RECEPTOR A AGONISTS USEFUL FOR THE TREATMENT OF CARDIOMETABOLIC DISEASES, KIDNEY DISEASE AND DIABETESNovember 2021September 2024Allow3400YesNo
17608392INHIBITING TRABIDNovember 2021March 2026Abandon5221NoNo
17607605NOVEL INDOLE-2-CARBOXAMIDES ACTIVE AGAINST THE HEPATITUS B VIRUS (HBV)October 2021July 2025Abandon4410NoNo
17607153A STABLE FORMULATION OF ARYLSULFONYLPROPENENITRILESOctober 2021August 2025Allow4531YesNo
17452507CRYSTALLINE FORMS OF A PHOSPHOINOSITIDE 3-KINASE (PI3K) INHIBITOROctober 2021August 2024Allow3310NoNo
17452025COMPOUNDS, COMPOSITIONS AND METHODSOctober 2021November 2024Allow3710YesNo
17501701METHODS OF USE FOR TRISUBSTITUTED BENZOTRIAZOLE DERIVATIVES AS DIHYDROOROTATE OXYGENASE INHIBITORSOctober 2021January 2025Allow3911NoNo
17601855PHARMACEUTICAL FORMULATIONS CONTAINING P2Y14 ANTAGONISTSOctober 2021July 2025Abandon4501NoNo
17600408TRIAZOLOPYRIMIDINES BASED ON THYMINE NUCLEOBASE AND METHODS FOR PRODUCING THEMSeptember 2021April 2025Allow4321NoNo
17599931NOVEL COMPOUND HAVING ANTICANCER ACTIVITY, AND METHOD FOR PRODUCING SAMESeptember 2021September 2025Abandon4831NoNo
17593372SMALL MOLECULES TARGETING THE INTRINSICALLY DISORDERED STRUCTURAL ENSEMBLE OF ALPHA-SYNUCLEIN PROTECT AGAINST DIVERSE ALPHA-SYNUCLEIN MEDIATED DYSFUNCTIONSSeptember 2021October 2025Allow4911NoNo
17439324EGFR INHIBITORS, COMPOSITIONS AND METHODS THERE OFSeptember 2021March 2025Abandon4201NoNo
17437364USE OF A NEMATICIDE COMPOSITIONSeptember 2021June 2025Allow4520NoNo
17436821COMPOUNDS HAVING BOTH EFFECTS OF BET BROMODOMAIN PROTEIN INHIBITION AND PD-L1 GENE REGULATIONSeptember 2021March 2025Abandon4210NoNo
17462800ANHYDROUS COMPOSITIONS OF mTOR INHIBITORS AND METHODS OF USEAugust 2021December 2024Allow4010NoNo
17411343PHARMACEUTICAL COMPOUNDSAugust 2021June 2025Abandon4510NoNo
17409834COMPOSITIONS AND METHODS OF TREATMENT FOR NEUROLOGICAL DISORDERS COMPRISING A DEMENTIAAugust 2021December 2024Allow4031YesNo
17409836COMPOSITIONS AND METHODS OF TREATMENT FOR NEUROLOGICAL DISORDERS COMPRISING MOTOR NEURON DISEASESAugust 2021December 2024Allow4031NoNo
17432089Novel compounds and their uses as thyroid hormone receptor agonistsAugust 2021February 2025Allow4211NoNo
17428600METHODS OF INDUCING AUTOPHAGY USING COUMARIN DERIVATIVES AND RELATED COMPOUNDSAugust 2021February 2026Allow5511NoNo
17427070HYDRAZIDE COMPOUND AND KINASE INHIBITORJuly 2021December 2024Abandon4110NoNo
17423151SUBSTITUTED POLYCYCLIC CARBOXYLIC ACIDS, ANALOGUES THEREOF, AND METHODS USING SAMEJuly 2021March 2025Abandon4401NoNo
17371001BICYCLIC KETONE COMPOUNDS AND METHODS OF USE THEREOFJuly 2021February 2025Allow4321NoNo
17370216MODULATORS OF PIN1 ACTIVITY AND USES THEREOFJuly 2021September 2025Abandon5011NoNo
17419837INHIBITORS OF CGAS ACTIVITY AS THERAPEUTIC AGENTSJune 2021February 2025Abandon4301NoNo
17418693ETHYLENEDIAMINE COMPOUND AND USE THEREOFJune 2021November 2024Abandon4101NoNo
17416971CYCLIN-DEPENDENT KINASE INHIBITORSJune 2021May 2025Abandon4711NoNo
17416741Chemical Compound Manufacture, New Salt Form, And Therapeutic Uses ThereofJune 2021February 2025Allow4441NoNo
17413425N-CONTAINING CHROMEN-4-ONE DERIVATIVES FOR THE TREATMENT AND PROPHYLAXIS OF HEPATITIS B VIRUS INFECTIONJune 2021December 2024Abandon4210NoNo
17312810CROMOLYN ESTERS AND USES THEREOFJune 2021April 2025Allow4621NoNo
173119741-(2,6-DIAZASPIRO[3.3]HEPTAN-6-YL)-5,6-DIHYDRO-4H-BENZO[F][1,2,4]TRIAZOLO[4,3-A][1,4]DIAZEPINE DERIVATIVES AND RELATED COMPOUNDS AS VASOPRESSIN ANTAGONISTS FOR THE TREATMENT OF NEURO-PSYCHOLOGICAL DISORDERSJune 2021July 2024Allow3810NoNo
17299930SYNERGISTIC COMPOSITIONS COMPRISING R-2-(SUBSTITUTED-SULFONYL)-HEXAHYDRO-PYRROLO[1,2-A]PYRAZIN-6(2H)-ONES AND S-2-(SUBSTITUTED-SULFONYL)-HEXAHYDRO-PYRROLO[1,2-A]PYRAZIN-6(2H)-ONES IN A NON-RACEMIC RATIOJune 2021September 2025Abandon5121NoNo
17311293COMPOUNDS HAVING PDE9A INHIBITORY ACTIVITY, AND PHARMACEUTICAL USES THEREOFJune 2021September 2024Allow4011NoNo
17311287COMPOUNDS HAVING PDE9A INHIBITORY ACTIVITY, AND PHARMACEUTICAL USES THEREOFJune 2021September 2024Allow4011NoNo
17337570INHIBITORS OF ERK NUCLEAR TRANSLOCATIONJune 2021January 2025Allow4411NoNo
17337547SYNTHESIS OF TRANS-8-CHLORO-5-METHYL-1 -[4-(PYRIDIN-2-YLOXY)-CYCLOHEXYL]-5,6-DIHYDRO-4H-2,3,5,10B-TETRAAZA-BENZO[E]AZULENE AND CRYSTALLINE FORMS THEREOFJune 2021July 2025Allow4911NoNo
17335440Methods of Inhibiting Osteoclastogenesis and Osteoclast ActivityJune 2021January 2026Abandon5521NoNo
17296836SALT AND CRYSTALLINE FORM OF FUROPYRIMIDINE COMPOUND AND PHARMACEUTICAL USE THEREOFMay 2021October 2024Allow4111NoNo
17243120THERAPEUTIC COMPOUNDS AND COMPOSITIONSApril 2021December 2024Abandon4410NoNo
17289418COMPOSITIONS AND METHODS FOR THE TREATMENT OF ADENOMYOSIS AND RECTOVAGINAL ENDOMETRIOSISApril 2021August 2024Allow4011NoNo
17241906AMORPHOUS SOLID DISPERSION COMPRISING 6-(1-ACRYLOYLPIPERIDIN-4-YL)-2-(4-PHENOXYPHENYL)NICOTINAMIDEApril 2021August 2024Allow4011NoNo
17235321PESTICIDALLY ACTIVE POLYCYCLIC DERIVATIVES WITH SULFUR CONTAINING SUBSTITUENTSApril 2021June 2024Allow3801NoNo
17283613BENZOXAZOLE AND RELATED COMPOUNDS USEFUL AS CHAPERONE-MEDIATED AUTOPHAGY MODULATORSApril 2021July 2025Allow5140YesNo
17282547COMPOSITION FOR PREVENTION OR TREATMENT OF MACULAR DEGENERATIONApril 2021October 2024Allow4321NoNo
17204206PARG INHIBITORY COMPOUNDSMarch 2021June 2024Allow3911NoNo
17271950CHRONIC NIGHTLY DOSING OF LASMIDITAN FOR MIGRAINE PREVENTIONFebruary 2021May 2024Allow3810YesNo

Appeals Overview

This analysis examines appeal outcomes and the strategic value of filing appeals for examiner CHENG, KAREN.

Strategic Value of Filing an Appeal

Total Appeal Filings
2
Allowed After Appeal Filing
2
(100.0%)
Not Allowed After Appeal Filing
0
(0.0%)
Filing Benefit Percentile
95.6%
Higher 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, 100.0% of applications that filed an appeal were subsequently allowed. This appeal filing benefit rate is in the top 25% across the USPTO, indicating that filing appeals is particularly effective here. The act of filing often prompts favorable reconsideration during the mandatory appeal conference.

Strategic Recommendations

Filing a Notice of Appeal is strategically valuable. The act of filing often prompts favorable reconsideration during the mandatory appeal conference.

Examiner CHENG, KAREN - Prosecution Strategy Guide

Executive Summary

Examiner CHENG, KAREN works in Art Unit 1623 and has examined 196 patent applications in our dataset. With an allowance rate of 87.8%, this examiner has an above-average tendency to allow applications. Applications typically reach final disposition in approximately 23 months.

Allowance Patterns

Examiner CHENG, KAREN's allowance rate of 87.8% places them in the 67% percentile among all USPTO examiners. This examiner has an above-average tendency to allow applications.

Office Action Patterns

On average, applications examined by CHENG, KAREN receive 1.13 office actions before reaching final disposition. This places the examiner in the 12% percentile for office actions issued. This examiner issues significantly fewer office actions than most examiners.

Prosecution Timeline

The median time to disposition (half-life) for applications examined by CHENG, KAREN is 23 months. This places the examiner in the 85% percentile for prosecution speed. Applications move through prosecution relatively quickly with this examiner.

Interview Effectiveness

Conducting an examiner interview provides a +17.1% benefit to allowance rate for applications examined by CHENG, KAREN. This interview benefit is in the 58% percentile among all examiners. Recommendation: Interviews provide an above-average benefit with this examiner and are worth considering.

Request for Continued Examination (RCE) Effectiveness

When applicants file an RCE with this examiner, 34.1% of applications are subsequently allowed. This success rate is in the 75% percentile among all examiners. Strategic Insight: RCEs show above-average effectiveness with this examiner. Consider whether your amendments or new arguments are strong enough to warrant an RCE versus filing a continuation.

After-Final Amendment Practice

This examiner enters after-final amendments leading to allowance in 57.7% of cases where such amendments are filed. This entry rate is in the 84% percentile among all examiners. Strategic Recommendation: This examiner is highly receptive to after-final amendments compared to other examiners. Per MPEP § 714.12, after-final amendments may be entered "under justifiable circumstances." Consider filing after-final amendments with a clear showing of allowability rather than immediately filing an RCE, as this examiner frequently enters such amendments.

Appeal Withdrawal and Reconsideration

This examiner withdraws rejections or reopens prosecution in 100.0% of appeals filed. This is in the 86% percentile among all examiners. Of these withdrawals, 100.0% occur early in the appeal process (after Notice of Appeal but before Appeal Brief). Strategic Insight: This examiner frequently reconsiders rejections during the appeal process compared to other examiners. Per MPEP § 1207.01, all appeals must go through a mandatory appeal conference. Filing a Notice of Appeal may prompt favorable reconsideration even before you file an Appeal Brief.

Petition Practice

When applicants file petitions regarding this examiner's actions, 71.9% are granted (fully or in part). This grant rate is in the 78% percentile among all examiners. Strategic Note: Petitions are frequently granted regarding this examiner's actions compared to other examiners. Per MPEP § 1002.02(c), various examiner actions are petitionable to the Technology Center Director, including prematureness of final rejection, refusal to enter amendments, and requirement for information. If you believe an examiner action is improper, consider filing a petition.

Examiner Cooperation and Flexibility

Examiner's Amendments: This examiner makes examiner's amendments in 10.2% of allowed cases (in the 94% percentile). Per MPEP § 1302.04, examiner's amendments are used to place applications in condition for allowance when only minor changes are needed. This examiner frequently uses this tool compared to other examiners, indicating a cooperative approach to getting applications allowed. Strategic Insight: If you are close to allowance but minor claim amendments are needed, this examiner may be willing to make an examiner's amendment rather than requiring another round of prosecution.

Quayle Actions: This examiner issues Ex Parte Quayle actions in 0.0% of allowed cases (in the 1% percentile). This examiner rarely issues Quayle actions compared to other examiners. Allowances typically come directly without a separate action for formal matters.

Prosecution Strategy Recommendations

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

  • Consider after-final amendments: This examiner frequently enters after-final amendments. If you can clearly overcome rejections with claim amendments, file an after-final amendment before resorting to an RCE.
  • Appeal filing as negotiation tool: This examiner frequently reconsiders rejections during the appeal process. Filing a Notice of Appeal may prompt favorable reconsideration during the mandatory appeal conference.
  • Examiner cooperation: This examiner frequently makes examiner's amendments to place applications in condition for allowance. If you are close to allowance, the examiner may help finalize the claims.

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.