Prosecution Insights
Last updated: October 26, 2026

Hanway Chang, USPTO Patent Examiner

Listed by the USPTO as CHANG, HANWAY

Tech Center 2800 • Art Units: 2872 2878 2881

This examiner grants 86% of resolved cases

Analysis

CHANG, HANWAY has 679 resolved cases, with an 86.2% allowance rate and a median of 810 days to allowance. The profile is assigned to Tech Center 2800 and art unit 2872. The 7.7% interview lift is positive but modest in the available record.

The listed companies are Taiwan Semiconductor Manufacturing Company, Ltd., LG Electronics Inc., and Neuboron Therapy System Ltd. Studebaker Brackett PLLC, ARENTFOX SCHIFF LLP, and CROWELL & MORING LLP are the leading listed firms. The allowance rate and timing provide useful planning context, while the interview figure supports a selective rather than automatic interview strategy.

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

Performance Statistics

86.2%
Allow Rate
+18.2% vs TC avg
705
Total Applications
+7.7%
Interview Lift
810
Avg Prosecution Days
Based on 679 resolved cases, 2023–2026

Rejection Statute Breakdown

2.1%
§101 Eligibility
33.4%
§102 Novelty
41.5%
§103 Obviousness
5.9%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18795274 AIR CONDITIONER Non-Final OA LG ELECTRONICS INC.
18274047 Lamella Mounting Method, and Analysis System Non-Final OA Hitachi High-Tech Corporation
18788380 CONTROL OF DYNAMIC GAS LOCK FLOW INLETS OF AN INTERMEDIATE FOCUS CAP Non-Final OA Taiwan Semiconductor Manufacturing Company, Ltd.
18781435 EUV LITHOGRAPHY APPARATUS Non-Final OA Taiwan Semiconductor Manufacturing Company, Ltd.
18776833 METHOD AND APPARATUS FOR MITIGATING CONTAMINATION Non-Final OA Taiwan Semiconductor Manufacturing Company, Ltd.
18787736 LITHOGRAPHY THERMAL CONTROL Non-Final OA Taiwan Semiconductor Manufacturing Co., Ltd.

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Frequently Asked Questions

What is examiner Hanway Chang's allowance rate?

86.2% of resolved applications examined by Hanway Chang were allowed (679 resolved cases), compared with 64.9% across Art Unit 2872 over the last five years.

Does an interview help with examiner Hanway Chang?

This examiner's interview lift is +7.7 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

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

Applications allowed by Hanway Chang took 810 days on average from filing to allowance.

Which art unit does examiner Hanway Chang work in?

Hanway Chang examines applications in Art Unit 2872 in Tech Center 2800 (Semiconductors, Circuits & Optics).

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