Prosecution Insights
Last updated: October 26, 2026

Changhyun Yi, USPTO Patent Examiner

Listed by the USPTO as YI, CHANGHYUN

Tech Center 2800 • Art Units: 2800 2812 2814 2826 2834

This examiner grants 94% of resolved cases

Analysis

YI, CHANGHYUN is assigned to tech center 2800 and art unit 2800. The record covers 1106 resolved cases, with an allowance rate of 93.9% and a median of 655 days to allowance. Interviews show a 4.3% lift, indicating a modest positive association with allowance outcomes.

The listed companies are Taiwan Semiconductor Manufacturing Company, SK hynix, and Samsung Display. The listed firms are Haynes and Boone, LLP, Knobbe, Martens, Olson & Bear, LLP, and Cooper Legal Group LLC. The allowance rate and timing support an efficient prosecution profile, while interviews appear useful but not essential.

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

Performance Statistics

93.9%
Allow Rate
+25.9% vs TC avg
1,169
Total Applications
+4.3%
Interview Lift
655
Avg Prosecution Days
Based on 1106 resolved cases, 2023–2026

Rejection Statute Breakdown

2.6%
§101 Eligibility
35.4%
§102 Novelty
36.9%
§103 Obviousness
13.6%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18597124 DISPLAY DEVICE FOR VEHICLE AND VEHICLE INCLUDING THE SAME Non-Final OA Samsung Display Co., LTD.
18397252 SEMICONDUCTOR DEVICE Final Rejection SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.
18538557 DIE WITH BOND PAD Non-Final OA TEXAS INSTRUMENTS INCORPORATED
18499985 SEMICONDUCTOR MEMORY DEVICE AND METHOD OF MANUFACTURING THE SEMICONDUCTOR MEMORY DEVICE Final Rejection SK hynix Inc.
18782434 METHODS AND SYSTEMS FOR CONTROLLING HEIGHTS OF DEVICE PACKAGES Non-Final OA SK Hynix NAND Product Solutions Corp. (dba Solidigm)
18513948 LIGHT EMITTING DEVICE AND METHOD OF MANUFACTURING THE SAME Final Rejection ROHM CO., LTD.
18781815 HEMT TRANSISTOR WITH ADJUSTED GATE-SOURCE DISTANCE, AND MANUFACTURING METHOD THEREOF Non-Final OA STMicroelectronics S.r.l.
18787572 FIELD-EFFECT TRANSISTOR AND METHOD OF FORMING THE SAME Non-Final OA Taiwan Semiconductor Manufacturing Company, Ltd.
18782962 HYBRID SEMICONDUCTOR DEVICE Non-Final OA Taiwan Semiconductor Manufacturing Company, Ltd.
18780969 Protective Liner for Source/Drain Contact to Prevent Electrical Bridging While Minimizing Resistance Non-Final OA Taiwan Semiconductor Manufacturing Company, Ltd.
18596416 METHOD OF FORMING NANOSTRUCTURE DEVICE AND RELATED STRUCTURE Non-Final OA Taiwan Semiconductor Manufacturing Company Ltd.
18789176 SOURCE/DRAIN FORMATION WITH REDUCED SELECTIVE LOSS DEFECTS Non-Final OA Taiwan Semiconductor Manufacturing Co., Ltd.
18787838 BACKSIDE POWER RAIL AND METHODS OF FORMING THE SAME Non-Final OA Taiwan Semiconductor Manufacturing Co., Ltd.
18787531 Semiconductor Devices and Methods Non-Final OA Taiwan Semiconductor Manufacturing Co., Ltd.
18780927 GATE-ALL-AROUND DEVICES HAVING SELF-ALIGNED CAPPING BETWEEN CHANNEL AND BACKSIDE POWER RAIL Non-Final OA Taiwan Semiconductor Manufacturing Co., Ltd.
18780592 SEMICONDUCTOR ARRANGEMENT AND METHOD OF MAKING Non-Final OA Taiwan Semiconductor Manufacturing Company Limited

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Frequently Asked Questions

What is examiner Changhyun Yi's allowance rate?

93.9% of resolved applications examined by Changhyun Yi were allowed (1,106 resolved cases), compared with 69.7% across Art Unit 2800 over the last five years.

Does an interview help with examiner Changhyun Yi?

This examiner's interview lift is +4.3 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Changhyun Yi take to allow a patent?

Applications allowed by Changhyun Yi took 655 days on average from filing to allowance.

Which art unit does examiner Changhyun Yi work in?

Changhyun Yi examines applications in Art Unit 2800 in Tech Center 2800 (Semiconductors, Circuits & Optics).

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