Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5658721 | Stabilized vinyl sulfone hardening compositions useful in photographic manufacturing | Mary Jane Griggs, Lewis R. Hamilton, Philip Raymond Martell | 1997-08-19 |
| 5514535 | Stabilized vinyl sulfone hardening compositions useful in photographic manufacturing | Lewis R. Hamilton, Philip Raymond Martell, Kristine F. Ohman | 1996-05-07 |
| 4252476 | Hydraulically operated mine prop with safety valve | Manfred Koppers | 1981-02-24 |
| 4183700 | Walking mine support | Gerhard von Klinggraff, Karlheinz Bohnes, Heinz Kunzer | 1980-01-15 |