Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D305213 | Road hazard warning sign | — | 1989-12-26 |
| 4849593 | Microwave-activated heating element | Calvin L. Seals | 1989-07-18 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D305213 | Road hazard warning sign | — | 1989-12-26 |
| 4849593 | Microwave-activated heating element | Calvin L. Seals | 1989-07-18 |