Prosecution Insights
Last updated: October 25, 2026

USPTO Art Unit 1638: Examiners and Allowance Rates

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

Art unit baseline (last 5 years, 1,294 dispositions): 49% allowance rate • 4.3 office actions per allowance • 1,515 days median pendency
ExaminerAllowance rateResolved casesPending apps
David W Berke-Schlessel100.0%10
Ivan A Greene100.0%10
Shubo Zhou95.0%200
Eileen B O Hara92.1%3420
Georgia L Helmer90.0%100
Elizabeth F Mcelwain88.3%3590
David T Fox88.0%3660
Russell Kallis88.0%3490
Robert M Kelly85.7%23733
Lee A Visone84.1%1760
Tracy Ann Vivlemore83.7%10451
Stuart F Baum82.8%4430
Medina Ahmed Ibrahim82.5%5190
Cynthia E Collins81.8%4900
Brent T Page81.7%5460
David H Kruse81.3%4450
Michael D Burkhart80.1%23127
Cathy Kingdon80.0%4700
Steven M Bernacki79.1%1530
Li Zheng78.6%4350
Anne R Kubelik76.7%4370
Hanna Marie Thueson75.9%2917
Phuong T Bui75.7%3870
Thomas Russe Amick74.5%9814
Ashwin D Mehta73.5%1130
Jared T Shapiro73.0%630
Vinod Kumar73.0%4110
Jeffrey R Bolland72.6%620
Keith O Neal Robinson70.6%1700
Michael C Wilson67.2%20154
Lauren K Van Buren65.6%9336
John David Moore61.1%5430
Mykola V Kovalenko58.3%480
Eric Jason Rogers57.7%10433
Matthew R Keogh57.4%540
Fatimah Khalaf Matalkah55.8%4330
Maria Gomez Leavitt53.6%280
Russell T Boggs53.1%490
Catherine Lynn Mccormick52.3%4424
Jason Deveau Rosen50.9%530
Ashley Kate Buran50.9%550
Walter Jackson III50.0%232
Kevin Kai Hill49.7%1771
Rebecca Johanna Stephens41.7%480
Allison Marie Johnson40.9%4428
Stephen G Uyeno32.4%370
Alexandra F Connors10.0%100
Vyoma Shubham Tiwari0.0%120
Paul D Roath0.0%10
Adam Michael Smith0.0%10
79937—01

Frequently Asked Questions

What is the allowance rate in USPTO Art Unit 1638?

48.8% over the last five years, across 1,294 resolved applications.

Which examiners in Art Unit 1638 have the highest allowance rates?

Among examiners with at least 30 resolved applications: Eileen B O Hara (92.1%, 342 resolved), Elizabeth F Mcelwain (88.3%, 359 resolved), David T Fox (88.0%, 366 resolved).

Which examiners in Art Unit 1638 have the lowest allowance rates?

Among examiners with at least 30 resolved applications: Stephen G Uyeno (32.4%, 37 resolved), Allison Marie Johnson (40.9%, 44 resolved), Rebecca Johanna Stephens (41.7%, 48 resolved).

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