Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4937413 | Acoustic sensor assembly for a microwave oven | Fred T. Spruytenburg, Charles W. McDonald | 1990-06-26 |
| 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 |