Ferns; Derek
Patent Applications and Registrations
Patent applications and USPTO patent grants for Ferns; Derek.The latest application filed is for "cover assembly with a locking mechanism".
- Ferns; Derek - Gwent GB3
- Ferns; Derek - Monmouth GB7
- Ferns; Derek - Trelleck GB7
| Patent | Date |
|---|---|
| Cover assembly with a locking mechanism Grant 4,955,752 - Ferns September 11, 1 | 1990-09-11 |
| Frame for a covering for an opening protected by a cover or grating Grant 4,936,703 - Ferns June 26, 1 | 1990-06-26 |
| Grating with a locking mechanism Grant 4,909,660 - Ferns March 20, 1 | 1990-03-20 |
| Covering for an opening with a cover or grating placed in a frame Grant 4,861,186 - Ferns August 29, 1 | 1989-08-29 |
| Manhole/access cover and frame assemblies Grant 4,498,804 - Ferns February 12, 1 | 1985-02-12 |
| Support frame Grant 4,174,183 - Ferns November 13, 1 | 1979-11-13 |
| Grating Grant 4,126,404 - Ferns November 21, 1 | 1978-11-21 |
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