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USPTO Patent Rankings Data through Sept 30, 2025
DP

Donald H. Parkes

TGThe Shivvers Group: 1 patents #1 of 4Top 25%
Lamoni, IA: #1 of 1 inventorsTop 100%
Iowa: #134 of 609 inventorsTop 25%
Overall (1994): #140,751 of 165,921Top 85%
1 Patents 1994

Issued Patents 1994

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
5279376 Force neutralizing mechanism for a single lever control Xinzhan Z. Yang, Douglas F. McFarland, Steven D. Shivvers 1994-01-18