Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4922951 | Service tee for connection to a gas or water main | — | 1990-05-08 |
| 4791280 | Method of operating a security device, security device and data carriers for use in the method | John O'Connell, Roy S. Jefferies, Hugh Trevor-Jones | 1988-12-13 |