Prosecution Insights
Last updated: October 25, 2026

USPTO Art Unit 2639: Examiners and Allowance Rates

19 examiners • 15 with pending office actions • Communications (Tech Center 2600)

Art unit baseline (last 5 years, 2,394 dispositions): 89% allowance rate • 2.4 office actions per allowance • 768 days median pendency
ExaminerAllowance rateResolved casesPending apps
Afroza Y Chowdhury100.0%10
Angel L Garces-Rivera95.7%470
Ahmed A Berhan95.1%24613
Luong Trung Nguyen94.2%690
Fayez A Bhuiyan93.2%440
Timothy J Henn91.9%20911
Hung H Lam91.7%1098
Padma Haliyur91.4%22114
James M Hannett90.9%20817
Nicholas G Giles90.4%11514
Cynthia Calderon90.1%17213
Joel W Fosselman89.8%1479
John H Morehead III87.7%13017
Akshay Trehan85.8%1209
Antoinette T Spinks83.4%20523
Wesley Jason Chiu74.6%13023
Twyler Lamb Haskins60.0%106
Surafel Yilmakassaye56.5%4619
Mouhammad Awni Aljundi—05

Frequently Asked Questions

What is the allowance rate in USPTO Art Unit 2639?

88.6% over the last five years, across 2,394 resolved applications.

Which examiners in Art Unit 2639 have the highest allowance rates?

Among examiners with at least 30 resolved applications: Angel L Garces-Rivera (95.7%, 47 resolved), Ahmed A Berhan (95.1%, 246 resolved), Luong Trung Nguyen (94.2%, 69 resolved).

Which examiners in Art Unit 2639 have the lowest allowance rates?

Among examiners with at least 30 resolved applications: Surafel Yilmakassaye (56.5%, 46 resolved), Wesley Jason Chiu (74.6%, 130 resolved), Antoinette T Spinks (83.4%, 205 resolved).

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