Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5086536 | Convertible vacuum cleaner | John R. Lackner, Stanley E. Grzywna, Thomas E. Baird | 1992-02-11 |
| 5007133 | Convertible vacuum cleaner | John R. Lackner, Stanley E. Grzywna, Thomas E. Baird | 1991-04-16 |
| 4947512 | Convertible vacuum cleaner | John R. Lackner, Stanley E. Grzywna, Thomas E. Baird | 1990-08-14 |