Issued Patents All Time
Showing 1–21 of 21 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12274905 | Sliding lock barbell adapter | Mark A. Derry, William Harrington | 2025-04-15 |
| 4899263 | Lamp fixture for illuminating interior of cigar lighter socket | Donald J. Mattis, Robert S. Miller | 1990-02-06 |
| 4840137 | Liquid level gauging apparatus | Thomas E. Beauvais, Vincent G. Krenke, Donald J. Mattis | 1989-06-20 |
| 4803320 | Electric switch construction | Donald J. Mattis | 1989-02-07 |
| 4758700 | Switch construction employing contact having spaced-apart contact points | Donald J. Mattis | 1988-07-19 |
| 4727239 | Plug having encapsulated thermal sensor, for engine block heater | Donald J. Mattis | 1988-02-23 |
| 4721846 | Canister heater with PTC wafer | Donald J. Mattis, Robert S. Miller | 1988-01-26 |
| 4717401 | Fuel vapor recovery system | Donald J. Mattis, Robert S. Miller | 1988-01-05 |
| 4695429 | Engine exhaust particulate ignitor construction | Donald J. Mattis | 1987-09-22 |
| 4694128 | Float switch construction for monitoring liquid levels | Donald J. Mattis | 1987-09-15 |
| 4673238 | One-piece wrap-around clamping shell for cigar lighter | Brooke N. Westover, John Comerford | 1987-06-16 |
| 4650936 | Electric switch construction | Donald J. Mattis | 1987-03-17 |
| 4634834 | Temperature controlled electric engine block | Donald J. Mattis | 1987-01-06 |
| 4604864 | Control circuit for use with air-diverter valve of internal combustion engine | — | 1986-08-12 |
| 4598686 | Fuel vapor recovery system for automotive vehicles | Donald J. Mattis, Robert S. Miller | 1986-07-08 |
| 4565991 | Chime generator circuit for connection with existing automobile radio speaker | Brooke N. Westover | 1986-01-21 |
| 4544226 | Two-piece clamp shell for electric cigar lighter | John Comerford | 1985-10-01 |
| 4537049 | Control circuit for locking mechanism of vehicle door | — | 1985-08-27 |
| 4527048 | Multi-piece clamping shell for electric cigar lighters | John Comerford | 1985-07-02 |
| 4413234 | Battery-operated condition monitor | — | 1983-11-01 |
| 4401972 | Stop-light monitor device | — | 1983-08-30 |