Prosecution Insights
Last updated: October 25, 2026

Ka Shan Choy, USPTO Patent Examiner

Listed by the USPTO as CHOY, KA SHAN

Tech Center 2400 • Art Units: 2400 2435

This examiner grants 93% of resolved cases

Analysis

CHOY, KA SHAN has resolved 275 cases in Tech Center 2400 and Art Unit 2400. The allowance rate is 93.1%, and the median time to allowance is 790 days. The recorded outcomes show a high rate of allowance among resolved matters, with a prosecution timeline that remains material despite that outcome.

The interview lift is 10.0%, so interviews have a more limited measured association with allowance than the overall allowance result. The leading companies are Centripetal Networks LLC, Hyland UK Operations Limited, and Zpaper Inc. The leading firms are BANNER & WITCOFF, LTD., Bekiares Eliezer LLP, and FERGUSON CASE ORR PATERSON LLP. Counsel may emphasize efficient written prosecution while using interviews selectively.

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

Performance Statistics

93.1%
Allow Rate
+35.1% vs TC avg
288
Total Applications
+10.0%
Interview Lift
790
Avg Prosecution Days
Based on 275 resolved cases, 2023–2026

Rejection Statute Breakdown

8.4%
§101 Eligibility
17.0%
§102 Novelty
44.5%
§103 Obviousness
19.6%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18999728 Efficient Threat Context-Aware Packet Filtering for Network Protection Non-Final OA Centripetal Networks, LLC
18950296 APPLICATION OF SECURITY PARAMETERS FOR CONTENT Non-Final OA Hyland UK Operations Limited
18999133 PROTECTION OF DOCUMENTS BY QR CODE-BASED STAMP Non-Final OA zPaper, Inc.
18676422 SYSTEMS AND METHODS FOR NETWORK TRAFFIC FINGERPRINTING AND ASSOCIATED SECURITY ACTIONS Final Rejection FoxIO, LLC
18378615 System and Methods Involving Features of Hardware Virtualization, Hypervisors, APIs of Interest and/or Other Features Final Rejection Lynx Software Technologies

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Frequently Asked Questions

What is examiner Ka Shan Choy's allowance rate?

93.1% of resolved applications examined by Ka Shan Choy were allowed (275 resolved cases), compared with 49.8% across Art Unit 2400 over the last five years.

Does an interview help with examiner Ka Shan Choy?

This examiner's interview lift is +10.0 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Ka Shan Choy take to allow a patent?

Applications allowed by Ka Shan Choy took 790 days on average from filing to allowance.

Which art unit does examiner Ka Shan Choy work in?

Ka Shan Choy examines applications in Art Unit 2400 in Tech Center 2400 (Networking & Security).

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