NL Petroleum Products Limited
Patent Applications and Registrations
Patent applications and USPTO patent grants for NL Petroleum Products Limited.The latest application filed is for "cutting elements for rotary drill bits".
- NL Petroleum Products Limited - Gloucestershire GB2
- NL Petroleum Products Limited - GB2 GB2
- NL Petroleum Products Limited - Cheltenham GB2
- NL Petroleum Products Limited - Stonehouse GB2
- NL Petroleum Products Limited - London GB2
| Patent | Date |
|---|---|
| Cutting elements for rotary drill bits Grant 4,928,777 - Shirley-Fisher May 29, 1 | 1990-05-29 |
| Rotary drill bits Grant 4,823,892 - Fuller April 25, 1 | 1989-04-25 |
| Rotary drill bits Grant 4,804,049 - Barr February 14, 1 | 1989-02-14 |
| Cutting structures for rotary drill bits Grant 4,781,256 - Wardley November 1, 1 | 1988-11-01 |
| Rotary drill bits Grant 4,762,028 - Regan August 9, 1 | 1988-08-09 |
| Rotary drill bits Grant 4,733,735 - Barr , et al. March 29, 1 | 1988-03-29 |
| Rotary drill bits Grant 4,720,371 - Shirley January 19, 1 | 1988-01-19 |
| Rotary drill bits Grant 4,718,505 - Fuller January 12, 1 | 1988-01-12 |
| Cutter assemblies for rotary drill bits Grant 4,705,122 - Wardley , et al. November 10, 1 | 1987-11-10 |
| Method of forming cutting structures for rotary drill bits Grant 4,699,227 - Wardley October 13, 1 | 1987-10-13 |
| Rotary drill bits with nozzle former and method of manufacturing Grant 4,694,919 - Barr September 22, 1 | 1987-09-22 |
| Rotary drill bits and cutting elements for such bits Grant 4,679,639 - Barr , et al. July 14, 1 | 1987-07-14 |
| Manufacture of rotary drill bits Grant 4,669,522 - Griffin June 2, 1 | 1987-06-02 |
| Manufacture of rotary drill bits Grant 4,624,830 - Barr November 25, 1 | 1986-11-25 |
| Rotary drill bits Grant 4,596,296 - Matthias June 24, 1 | 1986-06-24 |
| Rotary drill bits Grant 4,577,706 - Barr March 25, 1 | 1986-03-25 |
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