Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5215502 | Constant velocity elastomeric joint | Willem Broekhuizen, Ernst C. Schellhase | 1993-06-01 |
| 5059094 | Rotor redundant force retention system for VTOL and VSTOL aircraft | Madison K. Robinson, Martin H. Lufkin | 1991-10-22 |
| 5031858 | Apparatus and method for folding and locking rotor blades | Ernst C. Schellhase, Dan Anastas, deceased, by Peggy Anastas, executrix, Paul E. Keefer, Cecil E. Covington +1 more | 1991-07-16 |
| 4734081 | Constant velocity elastomeric bearing joint | Willem Broekhuizen, Ernst C. Schellhase | 1988-03-29 |
| 4729753 | Constant velocity elastomeric bearing joint | Willem Broekhuizen, Ernst C. Schellhase | 1988-03-08 |
| 4427340 | Soft inplane bearingless helicopter rotor | Robert W. Metzger, Peter A. Reyes, Patrick R. Tisdale, Cecil E. Covington, Willem Broekhuizen | 1984-01-24 |
| 4333728 | Compound hub spring system for helicopters | Jan M. Drees, Larry W. Dooley | 1982-06-08 |
| 4239455 | Blade-mounted centrifugal pendulum | Willem Broekhuizen, Troy M. Gaffey, Mukund M. Joglekar | 1980-12-16 |
| 4239456 | Rotor blade out-of-plane centrifugal pendulums | Mukund M. Joglekar, Troy M. Gaffey, Willem Broekhuizen | 1980-12-16 |