Prosecution Insights
Last updated: October 26, 2026

Joseph Chang, USPTO Patent Examiner

Listed by the USPTO as CHANG, JOSEPH

Tech Center 2800 • Art Units: 2817 2836 2842 2843 2845 2849

This examiner grants 90% of resolved cases

Analysis

CHANG, JOSEPH is assigned to tech center 2800 and art unit 2817. The profile covers 1193 resolved cases, with an 89.8% allowance rate and a median of 709 days to allowance. The high allowance rate and the recorded pendency provide useful context for applicants evaluating prosecution expectations in this docket.

Interviews are associated with a 3.9% allowance-rate lift, a smaller effect than the profile’s overall allowance result. The principal companies listed are Huawei Technologies, Texas Instruments, and LG Electronics. The leading firms are NIXON & VANDERHYE, Bryan Cave Leighton Paisner, and GATES & COOPER. These recurring participants may offer practical signals about the technologies and prosecution approaches appearing most often in this examiner’s cases.

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

Performance Statistics

89.8%
Allow Rate
+21.8% vs TC avg
1,215
Total Applications
+3.9%
Interview Lift
709
Avg Prosecution Days
Based on 1193 resolved cases, 2023–2026

Rejection Statute Breakdown

2.1%
§101 Eligibility
37.0%
§102 Novelty
33.2%
§103 Obviousness
14.9%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
19248397 WIRELESS POWER TRANSMISSION APPARATUS, WIRELESS POWER TRANSMISSION METHOD, WIRELESS POWER RECEPTION APPARATUS, AND WIRELESS POWER RECEPTION METHOD Final Rejection LG ELECTRONICS INC.
19239889 VARIABLE-SPEED PHASE INTERPOLATOR Non-Final OA Samsung Electronics Co., Ltd.
19222522 RING OSCILLATOR AND COMMUNICATION APPARATUS Final Rejection HUAWEI TECHNOLOGIES CO., LTD.
18949939 WIRELESS POWER RECEIVER ARRANGEMENT WITH PLANAR INDUCTOR ARRANGEMENT AND RECONFIGURABLE SWITCHING NETWORK Non-Final OA Huawei Digital Power Technologies Co., Ltd.
19272985 OSCILLATOR FREQUENCY BASED ON MOBILITY AND PTAT TEMPERATURE COMPENSATION Non-Final OA TEXAS INSTRUMENTS INCORPORATED
19238783 Reducing Target Frequency Variation In Oscillator Non-Final OA Texas Instruments Incorporated
18341357 WIRELESS CHARGING PAD Non-Final OA International Business Machines Corporation

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Frequently Asked Questions

What is examiner Joseph Chang's allowance rate?

89.8% of resolved applications examined by Joseph Chang were allowed (1,193 resolved cases), compared with 81.7% across Art Unit 2817 over the last five years.

Does an interview help with examiner Joseph Chang?

This examiner's interview lift is +3.9 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Joseph Chang take to allow a patent?

Applications allowed by Joseph Chang took 709 days on average from filing to allowance.

Which art unit does examiner Joseph Chang work in?

Joseph Chang examines applications in Art Unit 2817 in Tech Center 2800 (Semiconductors, Circuits & Optics).

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