Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859986 | Object touchdown and net contact detection systems and game apparatus employing same | John A. Van Auken | 1989-08-22 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859986 | Object touchdown and net contact detection systems and game apparatus employing same | John A. Van Auken | 1989-08-22 |