Gray; Douglas S.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Gray; Douglas S..The latest application filed is for "ported slide gate valve with gate motion to break scale build up".
- Gray; Douglas S. - Lancaster PA
| Patent | Date |
|---|---|
| Ported slide gate valve with gate motion to break scale build up Grant 6,681,790 - Knobbe , et al. January 27, 2 | 2004-01-27 |
| Ported slide gate valve with gate motion to break scale build up App 20030062502 - Knobbe, Bruce P. ; et al. | 2003-04-03 |
| Trunnion type ball valve Grant 4,683,906 - Butler , et al. August 4, 1 | 1987-08-04 |
| SEC | 0001232990 | GRAY DOUGLAS S |
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