Cockrell; Darryl W.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Cockrell; Darryl W..The latest application filed is for "combination release mechanism for downhole well apparatus".
- Cockrell; Darryl W. - Houston TX
| Patent | Date |
|---|---|
| Combination release mechanism for downhole well apparatus Grant 4,437,516 - Cockrell March 20, 1 | 1984-03-20 |
| Sub-surface Safety Valve With Improved Balancing Valve Means Grant 3,830,297 - Cockrell August 20, 1 | 1974-08-20 |
| Retrievable Well Packer Grant 3,678,998 - Cockrell , et al. July 25, 1 | 1972-07-25 |
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