Patent Leaderboard
USPTO Patent Rankings Data through Sept 30, 2025
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Andrew C. Keefe — 2 Patents in 2017

HLHrl Laboratories: 2 patents #56 of 154Top 40%
Calabasas, CA: #45 of 337 inventorsTop 15%
California: #13,043 of 60,394 inventorsTop 25%
Overall (2017): #171,076 of 506,227Top 35%
2 Patents 2017

Issued Patents 2017

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
9822835 Torsion springs with changeable stiffness Geoffrey P. McKnight, Sloan P. Smith, Christopher B. Churchill 2017-11-21
9791014 Enhanced damping materials using negative stiffness inserts Geoffrey P. McKnight, Chia-Ming Chang, William Carter 2017-10-17