Prosecution Insights
Last updated: October 25, 2026

USPTO Art Unit 2121: Examiners and Allowance Rates

82 examiners • 15 with pending office actions • Computing & Software (Tech Center 2100)

Art unit baseline (last 5 years, 1,801 dispositions): 32% allowance rate • 4.9 office actions per allowance • 1,702 days median pendency
ExaminerAllowance rateResolved casesPending apps
Mohammad A Rahman100.0%20
Keith Lucas Kevelson100.0%10
Brian J Hales100.0%10
Hien Dieu Thi Khuu100.0%10
Quoc A Tran100.0%10
Thomas K Pham100.0%10
Suresh Suryawanshi95.0%400
Vincent Huy Tran92.3%390
Ramesh B Patel92.1%1510
Ronald D Hartman Jr.89.3%3560
Crystal Joy Barnes-Bullock88.9%1260
Daniel T Pellett82.9%2938
Lut Wong82.7%1040
Charles R Kasenge80.8%4320
Yuhui R Pan77.9%1130
Stanley K Hill77.1%480
Douglas S Lee77.1%1700
Chad G Erdman75.9%290
Chad Rapp75.8%2440
Ryan A Jarrett75.1%4290
Christopher E Everett74.5%3140
Steven R Garland73.8%2290
Patrick D Cummins73.7%190
Sean P Shechtman72.1%5300
Thomas H Stevens70.8%2360
James D Rutten69.7%25117
Jue Wang Louie68.9%1030
Michael B Holmes68.6%350
Geoffrey Wellman68.2%220
Sivalingam Sivanesan67.7%620
David Robertson66.2%680
Maria N Von Buhr66.2%650
Mohammed Shafayet64.3%280
Darrin D Dunn64.2%3350
Selene Haedi61.5%390
Michael J Huntley59.8%970
Henry K Nguyen59.3%1679
Mikayla Chubb56.9%580
Anthony T Whittington56.2%160
Peter D Coughlan52.6%1140
Michael W Choi51.6%310
Sunray Chang51.3%2340
Markus A Vasquez51.2%21311
Tejal Gami50.0%820
Scott Richard Gardner50.0%40
David J Wynne49.1%570
Moriam Mosunmola Godo48.6%370
Jason Lin47.5%2020
Tewodros E Mengistu44.4%270
Olvin Lopez Alvarez43.9%2280
Derrick A Boateng40.0%300
Istiaque Ahmed40.0%250
Byungkwon Han40.0%514
William Wai Kwan39.7%580
Alan Chu39.0%590
Michael Joseph Scapin38.2%340
Md N Mia37.9%290
Sadik Ahmed Alshahari34.8%4615
Daniel Patrick Gruszka33.3%621
Martti U Kontkanen33.3%30
Jennifer L Norton31.6%980
Tsu-Chang Lee31.4%350
Griffin Tanner Bean28.1%3223
Tirumale K Ramesh26.0%5021
Leah M Feitl20.9%430
Kenneth M Lo20.8%480
Jessica Thuy Pham18.2%1119
Daravanh Phakousonh16.7%618
Benjamin J Buss12.5%80
Li B Zhen7.3%414
Kavita Stanley0.0%140
Tao Peng0.0%90
Albert Decady0.0%50
Lindsay Gage Mcguinness0.0%20
Nigel Gordon Ray0.0%20
Paul Freymuth Daebeler0.0%10
Phat Minh Dang0.0%10
Kelvin Booker0.0%10
David Hoang Tran0.0%10
Abdullah Khaled Aboud—018
Nadeem Amir Abdulmelik—03
Ayush Reddy Malpeddi—02

Frequently Asked Questions

What is the allowance rate in USPTO Art Unit 2121?

32.0% over the last five years, across 1,801 resolved applications.

Which examiners in Art Unit 2121 have the highest allowance rates?

Among examiners with at least 30 resolved applications: Suresh Suryawanshi (95.0%, 40 resolved), Vincent Huy Tran (92.3%, 39 resolved), Ramesh B Patel (92.1%, 151 resolved).

Which examiners in Art Unit 2121 have the lowest allowance rates?

Among examiners with at least 30 resolved applications: Li B Zhen (7.3%, 41 resolved), Kenneth M Lo (20.8%, 48 resolved), Leah M Feitl (20.9%, 43 resolved).

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