Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 4438380 | Stepping motor excitation circuitry | — | 1984-03-20 | $10,923,000 |
| 4200894 | Head adjustment mechanism for rigid magnetic disc memory apparatus | Lenn Daugherty, Sigmund Hinlein, Michael A. Feldstein, Harold Thackaberry | 1980-04-29 | $4,059,000 |
| 4194226 | Rigid magnetic disc memory apparatus including open loop stepper-motor-driven read/write head | Lenn Daugherty, Sigmund Hinlein | 1980-03-18 | $3,878,000 |
| 4185310 | Cooling apparatus for spinning magnetic disc memory apparatus | Lenn Daugherty, Sigmund Hinlein, David Chastain | 1980-01-22 | $1,782,000 |