Prosecution Insights
Last updated: October 26, 2026

Charles Z Constantine, USPTO Patent Examiner

Listed by the USPTO as CONSTANTINE, CHARLES Z

Tech Center 1600 • Art Units: 1651 1657

This examiner grants 59% of resolved cases

Performance Statistics

59.0%
Allow Rate
-1.0% vs TC avg
455
Total Applications
+49.3%
Interview Lift
1140
Avg Prosecution Days
Based on 432 resolved cases, 2023–2026

Rejection Statute Breakdown

6.0%
§101 Eligibility
15.4%
§102 Novelty
32.5%
§103 Obviousness
30.5%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18696966 NOVEL ACETOHYDROXY ACID SYNTHASE VARIANT, AND METHOD FOR PRODUCING L-ISOLEUCINE USING SAME Non-Final OA CJ CHEILJEDANG CORPORATION
18265797 METHOD FOR MEASUREMENT IN BIOSENSORS Non-Final OA The University of North Carolina at Chapel Hill
18809575 PROCESSES FOR OBTAINING MICROBIAL OIL FROM MICROBIAL CELLS Non-Final OA DSM IP Assets B.V.
18855630 CONTINUOUS METHOD FOR GROWING A MICROORGANISM Non-Final OA SPECIALTY OPERATIONS FRANCE
18269694 ATP-PRT VARIANT WITH REDUCED FEEDBACK INHIBITION BY HISTIDINE, AND HISTIDINE-PRODUCING STRAIN EXPRESSING SAME Final Rejection DAESANG CORPORATION

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Frequently Asked Questions

What is examiner Charles Z Constantine's allowance rate?

59.0% of resolved applications examined by Charles Z Constantine were allowed (432 resolved cases), compared with 31.6% across Art Unit 1651 over the last five years.

Does an interview help with examiner Charles Z Constantine?

This examiner's interview lift is +49.3 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Charles Z Constantine take to allow a patent?

Applications allowed by Charles Z Constantine took 1,140 days on average from filing to allowance.

Which art unit does examiner Charles Z Constantine work in?

Charles Z Constantine examines applications in Art Unit 1651 in Tech Center 1600 (Biotechnology & Pharmaceuticals).

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