Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5647702 | Apparatus for drilling variable size holes in bowling ball | Bill E. Towers, Richard L. Weinbrenner | 1997-07-15 |
| 5609449 | Apparatus for fitting and for drilling variable size holes in a bowling ball | Bill E. Towers, Richard L. Weinbrenner | 1997-03-11 |
| 5601385 | Apparatus for fitting and drilling bowling balls | Bill E. Towers, Richard L. Weinbrenner | 1997-02-11 |