Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5157758 | Tungsten halogen lamp | John A. Letchford | 1992-10-20 |
| 4728763 | Microwave oven having a source of infra-red radiation | Geoffrey Ian Bell, Peter W. Crossley, Stephen Newton, Susan Crocker | 1988-03-01 |
| 4710677 | Incandescent lamps | Roger A. Hume | 1987-12-01 |
| D291368 | Filter holder | John A. Letchford | 1987-08-11 |
| 4598194 | Quartz infra-red lamps | John A. Letchford | 1986-07-01 |
| 4556786 | Heating apparatus | Kenneth S. Frost, John A. Letchford | 1985-12-03 |