Patent Leaderboard
USPTO Patent Rankings Data through Sept 30, 2025
RB

Robert D. Birkenmeyer — 4 Patents

TUThe Upjohn: 4 patents #111 of 528Top 25%
Kalamazoo, MI: #377 of 1,283 inventorsTop 30%
Michigan: #22,048 of 86,293 inventorsTop 30%
Overall (All Time): #1,309,579 of 4,157,543Top 35%
4 Patents All Time

Issued Patents All Time

Showing 1–4 of 4 patents

Patent #TitleCo-InventorsDate
4310660 Lincomycin compounds 1982-01-12
4309533 Lincomycin compounds 1982-01-05
4293547 Method of treating malaria Charles E. Lewis 1981-10-06
4278789 Lincomycin compounds 1981-07-14