Prosecution Insights
Last updated: October 08, 2026

USPTO Art Unit 1643: Examiners and Allowance Rates

34 examiners • 15 with pending office actions • Biotechnology & Pharmaceuticals (Tech Center 1600)

Art unit baseline (last 5 years, 3,994 dispositions): 41% allowance rate • 4.0 office actions per allowance • 446 days median pendency
ExaminerAllowance rateResolved casesPending apps
Robert S Landsman100.0%10
Chang Yu Wang100.0%10
Sarah Abdoalatif Alsomairy100.0%10
Gary B Nickol75.8%3335
Sheela Jitendra Huff71.7%1,0230
Francesca Edgingtongiordano70.8%10621
Amy Marie Chattin70.6%5127
Cheom-Gil Cheong69.6%690
Anne Gussow68.4%2370
Christopher H Yaen67.9%780
Elizabeth A Shupe66.7%7539
Lynn Anne Bristol63.4%1,15861
Meera Natarajan62.5%76337
Karen A Canella62.2%1,14140
Amber Kathleen Faust61.1%7238
Jessica Hope Roark57.5%5460
Sydney Van Druff55.0%14928
Julie Zhen Qin Wu54.4%909
Bradley Duffy54.4%75434
John Joseph Skoko III53.1%11330
Sung Min Yoon53.1%490
David J Blanchard46.5%1010
Hong Sang46.3%7190
Anne L Holleran45.8%2270
Bryan William Heck45.7%460
Alana Harris Dent44.1%74953
Stephen L Rawlings38.7%6050
Jieun Ham37.5%820
Angela C Brown-Pettigrew34.6%260
Carol Ann Chase30.0%100
Larry Ronald Helms20.0%50
Arthur S Leonard0.0%10
Prema Maria Mertz0.0%10
Malia Nicole Green—03

Frequently Asked Questions

What is the allowance rate in USPTO Art Unit 1643?

41.4% over the last five years, across 3,994 resolved applications.

Which examiners in Art Unit 1643 have the highest allowance rates?

Among examiners with at least 30 resolved applications: Gary B Nickol (75.8%, 33 resolved), Sheela Jitendra Huff (71.7%, 1,023 resolved), Francesca Edgingtongiordano (70.8%, 106 resolved).

Which examiners in Art Unit 1643 have the lowest allowance rates?

Among examiners with at least 30 resolved applications: Stephen L Rawlings (38.7%, 605 resolved), Alana Harris Dent (44.1%, 749 resolved), Bryan William Heck (45.7%, 46 resolved).

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