Prosecution Insights
Last updated: October 26, 2026

Allen Chao, USPTO Patent Examiner

Listed by the USPTO as CHAO, ALLEN

Tech Center 1600 • Art Units: 1622 1624 1629 1656

This examiner grants 60% of resolved cases

Analysis

CHAO, ALLEN works in tech center 1600 and art unit 1622. The profile covers 10 resolved cases, with a 60.0% allowance rate and a median of 1091 days to allowance. The small sample limits generalization, while the recorded figures show that allowance has occurred in a portion of the matters after an extended timeline.

The interview lift is 0.0%, so the available data does not show an allowance-rate change associated with interviews. Listed companies include INCYTE, Shionogi, and CJ CheilJedang. The leading firms are Apex Attorneys at Law, BakerHostetler, and BROWN RUDNICK. Application-specific review is especially important because the small record provides limited evidence for a generalized prosecution pattern.

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

Performance Statistics

60.0%
Allow Rate
At TC average
63
Total Applications
+0.0%
Interview Lift
1091
Avg Prosecution Days
Based on 10 resolved cases, 2023–2026

Rejection Statute Breakdown

0.9%
§101 Eligibility
22.8%
§102 Novelty
44.7%
§103 Obviousness
24.6%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18562666 METHOD FOR CRYSTALLIZATION OF AROMATIC AMINO ACIDS, ENABLING SUSTAINABLE CYCLE OF AMMONIA Final Rejection CJ CheilJedang Corporation
18293683 INHIBITORS OF HYPOXIA-INDUCIBLE FACTORS Non-Final OA The Johns Hopkins University
18685544 PYRAZINE COMPOUNDS FOR THE CONTROL OF INVERTEBRATE PESTS Non-Final OA BASF SE
18705851 FUNGICIDAL COMPOSITIONS COMPRISING FLUDIOXONIL Non-Final OA SYNGENTA CROP PROTECTION AG
18844280 INHIBITORS OF FLI1 AND ERG Non-Final OA UNIVERSITY OF VIRGINIA PATENT FOUNDATION
18554819 NON-COVALENT HALOTAG LIGANDS Final Rejection MAX-PLANCK-GESELLSCHAFT ZUR FÖRDERUNG DER WISSENSCHAFTEN E. V.

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Frequently Asked Questions

What is examiner Allen Chao's allowance rate?

60.0% of resolved applications examined by Allen Chao were allowed (10 resolved cases), compared with 60.6% across Art Unit 1622 over the last five years.

Does an interview help with examiner Allen Chao?

This examiner's interview lift is +0.0 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Allen Chao take to allow a patent?

Applications allowed by Allen Chao took 1,091 days on average from filing to allowance.

Which art unit does examiner Allen Chao work in?

Allen Chao examines applications in Art Unit 1622 in Tech Center 1600 (Biotechnology & Pharmaceuticals).

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