Prosecution Insights
Last updated: October 26, 2026

William B Chou, USPTO Patent Examiner

Listed by the USPTO as CHOU, WILLIAM B

Tech Center 3700 • Art Units: 3779 3795

This examiner grants 73% of resolved cases

Analysis

CHOU, WILLIAM B is assigned to Tech Center 3700 and Art Unit 3779. The profile includes 546 resolved cases, a 72.7% allowance rate, and a median of 1331 days to allowance. Interview lift is 20.6%, indicating that interviews have a positive association with allowance outcomes in the reported record.

The leading companies are Stryker Corporation, Boston Scientific Corporation, and 3Shape A/S. The listed firms are BakerHostetler, BUCHANAN, INGERSOLL & ROONEY PC, and MORRISON & FOERSTER LLP. The median timing points to extended prosecution, so practitioners may wish to align interview preparation with amendment strategy and continuation planning.

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

Performance Statistics

72.7%
Allow Rate
+2.7% vs TC avg
569
Total Applications
+20.6%
Interview Lift
1331
Avg Prosecution Days
Based on 546 resolved cases, 2023–2026

Rejection Statute Breakdown

0.7%
§101 Eligibility
21.0%
§102 Novelty
48.8%
§103 Obviousness
21.9%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
17811863 WIRELESS ENDOSCOPIC CAMERA WITH IMAGE COMPRESSION Final Rejection Stryker Corporation
18314196 IMAGING SYSTEM FOR ENDOSCOPE Non-Final OA Boston Scientific Scimed, Inc.

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Frequently Asked Questions

What is examiner William B Chou's allowance rate?

72.7% of resolved applications examined by William B Chou were allowed (546 resolved cases), compared with 0.0% across Art Unit 3779 over the last five years.

Does an interview help with examiner William B Chou?

This examiner's interview lift is +20.6 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner William B Chou take to allow a patent?

Applications allowed by William B Chou took 1,331 days on average from filing to allowance.

Which art unit does examiner William B Chou work in?

William B Chou examines applications in Art Unit 3779 in Tech Center 3700 (Medical Devices & Mechanical Engineering).

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