Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4572710 | Method and apparatus for changing filters in nuclear power stations | Donald E. Christofer, John C. Homer, Robert J. Torok, Thomas Whittington | 1986-02-25 |
| 4371201 | Reversing ratchet door closer | Donald Christopher | 1983-02-01 |
| 4353427 | Weight-sensor calibration for gravimetric coal feeder | Donald Christopher | 1982-10-12 |
| 4299722 | Introduction of fluent materials into containers | Paul Williams | 1981-11-10 |
| 4257518 | Feeder for particulate material | Donald E. Christofer | 1981-03-24 |