Prosecution Insights
Last updated: October 27, 2026

Feifei Yeung Lopez, USPTO Patent Examiner

Listed by the USPTO as YEUNG LOPEZ, FEIFEI

Tech Center 2800 • Art Units: 2826 2899

This examiner grants 81% of resolved cases

Performance Statistics

81.2%
Allow Rate
+13.2% vs TC avg
1,137
Total Applications
-2.5%
Interview Lift
883
Avg Prosecution Days
Based on 1092 resolved cases, 2023–2026

Rejection Statute Breakdown

0.4%
§101 Eligibility
24.3%
§102 Novelty
54.8%
§103 Obviousness
17.4%
§112 Clarity

Currently Pending Office Actions

App #TitleStatusAssignee
18890051 SEMICONDUCTOR DEVICE INCLUDING TWO-DIMENSIONAL MATERIAL AND MANUFACTURING METHOD THEREOF Non-Final OA Samsung Electronics Co., Ltd.
18740507 DISPLAY DEVICE, MANUFACTURING METHOD OF DISPLAY DEVICE, AND OPTICAL DEVICE Non-Final OA Samsung Display Co., Ltd.
18631184 DISPLAY DEVICE AND METHOD OF MANUFACTURING THE SAME Non-Final OA Samsung Display Co., LTD.
18548126 LIGHT EMITTING DEVICE AND METHOD OF MANUFACTURING LIGHT EMITTING DEVICE Final Rejection SONY SEMICONDUCTOR SOLUTIONS CORPORATION
18834852 Display Panel and Display Device Non-Final OA BOE TECHNOLOGY GROUP CO., LTD.
18710777 Display Panel, Display Apparatus, and Method for Manufacturing Display Panel Non-Final OA BOE TECHNOLOGY GROUP CO., LTD.
18279205 Display Substrate, Display Panel and Display Device Non-Final OA BOE Technology Group Co., Ltd.
18395907 PARTIAL BREAKDOWN OF PRECURSORS FOR ENHANCED ALD FILM GROWTH Final Rejection ASM IP Holding B.V.
18882346 SEMICONDUCTOR DEVICE Non-Final OA DENSO CORPORATION
18291200 GRAPHENE-CAPPED COPPER IN DUAL DAMASCENE INTERCONNECT Final Rejection Lam Research Corporation
18276516 LIGHT-EMITTING ELEMENT PACKAGE AND LIGHTING DEVICE HAVING SAME Non-Final OA LG INNOTEK CO., LTD.
18750269 SERPENTINE ELECTRODE FOR MEMORY DEVICES Non-Final OA International Business Machines Corporation
18652294 BACKSIDE DIELECTRIC PLUG Non-Final OA International Business Machines Corporation
18621051 BACKSIDE GATE TIE-DOWN IN BACKSIDE POWER DISTRIBUTION NETWORK (BSPDN) ARCHITECTURE Non-Final OA International Business Machines Corporation
18244466 PIXEL ISOLATION STRUCTURES AND METHODS OF MAKING THEM Non-Final OA Applied Materials, Inc.
18616924 MEMORY CELL BASED ON A PHASE-CHANGE MATERIAL Final Rejection STMicroelectronics International N.V.
17776078 SUPERCONDUCTING QUBITS BASED ON TANTALUM Final Rejection THE TRUSTEES OF PRINCETON UNIVERSITY
18416800 THIN FILM RESISTOR AND METHODS OF FORMING THE SAME Non-Final OA Taiwan Semiconductor Manufacturing Company, Ltd.
18589833 OPTOELECTRONIC SEMICONDUCTOR CHIP Final Rejection OSRAM OLED GmbH
18589885 OPTOELECTRONIC SEMICONDUCTOR CHIP Non-Final OA OSRAM OLED GmbH
18897449 UNIT PIXEL AND DISPLAYING APPARATUS INCLUDING THE UNIT PIXEL Non-Final OA SEOUL VIOSYS CO., LTD.
18811541 UNIT PIXEL HAVING LIGHT EMITTING DEVICE, METHOD OF FABRICATING THE SAME, AND DISPLAYING APPARATUS HAVING THE SAME Non-Final OA SEOUL VIOSYS CO., LTD.
18678845 LIGHT EMITTING DEVICE PACKAGE AND APPLICATION THEREOF Non-Final OA SEOUL VIOSYS CO., LTD.
18623750 UNIT PIXEL HAVING LIGHT EMITTING DEVICE DISPLAYING APPARATUS Final Rejection SEOUL VIOSYS CO., LTD.
18495110 SEMICONDUCTOR STRUCTURES AND MANUFACTURING METHODS THEREFOR Final Rejection Enkris Semiconductor, Inc.
18713618 LIGHT-EMITTING ELEMENT, DISPLAY DEVICE, AND PRODUCTION METHOD FOR LIGHT-EMITTING ELEMENT Non-Final OA SHARP DISPLA TECHNOLOGY CORPORATION

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Frequently Asked Questions

What is examiner Feifei Yeung Lopez's allowance rate?

81.2% of resolved applications examined by Feifei Yeung Lopez were allowed (1,092 resolved cases), compared with 65.7% across Art Unit 2826 over the last five years.

Does an interview help with examiner Feifei Yeung Lopez?

This examiner's interview lift is -2.5 percentage points: the difference in allowance rate between resolved applications that had an examiner interview and those that did not.

How long does examiner Feifei Yeung Lopez take to allow a patent?

Applications allowed by Feifei Yeung Lopez took 883 days on average from filing to allowance.

Which art unit does examiner Feifei Yeung Lopez work in?

Feifei Yeung Lopez examines applications in Art Unit 2826 in Tech Center 2800 (Semiconductors, Circuits & Optics).

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