Prosecution Insights
Last updated: October 27, 2026

Hilary Ann Petrash, USPTO Patent Examiner

Listed by the USPTO as PETRASH, HILARY ANN

Tech Center 1600 • Art Units: 1641 1644

This examiner grants 66% of resolved cases

Analysis

PETRASH, HILARY ANN is assigned to tech center 1600 and art unit 1641. The profile records 64 resolved cases, a 65.6% allowance rate, and a median of 1161 days to allowance. The interview lift is 50.2%, indicating a strong positive association between interviews and allowance outcomes in the available record.

Adc Therapeutics SA, Janssen Pharmaceuticals Inc., and ImmunityBio Inc. are the leading listed companies. The listed firms are MEDLER FERRO WOODHOUSE & MILLS PLLC, BIRCH STEWART KOLASCH & BIRCH, LLP, and Birchwood IP- CHK001. The limited case history warrants caution in projecting outcomes, but the interview measure supports careful preparation for direct examiner discussions.

Written from this page's own data; every figure is computed from USPTO records and verified before publication.

Performance Statistics

65.6%
Allow Rate
+5.6% vs TC avg
97
Total Applications
+50.2%
Interview Lift
1161
Avg Prosecution Days
Based on 64 resolved cases, 2023–2026

Rejection Statute Breakdown

3.6%
§101 Eligibility
13.7%
§102 Novelty
24.8%
§103 Obviousness
33.4%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
17539926 THERAPEUTIC AGENT OR PROPHYLACTIC AGENT FOR DEMENTIA Final Rejection TEIJIN PHARMA LIMITED
17491813 EVALUATION AND TREATMENT OF BRADYKININ-MEDIATED DISORDERS Final Rejection Takeda Pharmaceutical Company Limited
18415188 COMPOSITIONS AND METHODS FOR TREATING ACUTE MYELOID LEUKEMIA Non-Final OA Wuhan University

Facing This Examiner?

IP Author analyzes examiner patterns and generates tailored response strategies with the highest chance of allowance.

Build Your Strategy

Who Appears Before This Examiner

Top companies before this examiner

Law firms appearing most often

Frequently Asked Questions

What is examiner Hilary Ann Petrash's allowance rate?

65.6% of resolved applications examined by Hilary Ann Petrash were allowed (64 resolved cases), compared with 45.2% across Art Unit 1641 over the last five years.

Does an interview help with examiner Hilary Ann Petrash?

This examiner's interview lift is +50.2 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Hilary Ann Petrash take to allow a patent?

Applications allowed by Hilary Ann Petrash took 1,161 days on average from filing to allowance.

Which art unit does examiner Hilary Ann Petrash work in?

Hilary Ann Petrash examines applications in Art Unit 1641 in Tech Center 1600 (Biotechnology & Pharmaceuticals).

Sign in with your work email

Enter your email to receive a magic link. No password needed.

Personal email addresses (Gmail, Yahoo, etc.) are not accepted.

Free tier: 3 strategy analyses per month