Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D315690 | Instrument for testing the burst strength of sheet material | Walter F. Bachelder, John L. Sullivan, Godfrey L. Hansen | 1991-03-26 |
| 4928533 | Burst testing apparatus | Walter F. Bachelder, John L. Sullivan, Godfrey L. Hansen | 1990-05-29 |
| 4802366 | Apparatus and process for impact testing of plastics | Walter F. Bachelder, Maurice Frankel | 1989-02-07 |