Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873409 | Closed-loop microwave popcorn control | Fred T. Spruytenburg, Charles W. McDonald | 1989-10-10 |
| 4870238 | Microwave oven popcorn control | Charles W. McDonald | 1989-09-26 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873409 | Closed-loop microwave popcorn control | Fred T. Spruytenburg, Charles W. McDonald | 1989-10-10 |
| 4870238 | Microwave oven popcorn control | Charles W. McDonald | 1989-09-26 |