Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4496792 | Electrical conduit with vapor barrier device | G. Russell Balkwill, John F. Tamasovics | 1985-01-29 |
| 4408695 | Air and moisture resistant cover with electrical box having fastening flange | G. Russell Balkwill, John F. Tamasovics | 1983-10-11 |
| 4345693 | Air and moisture barrier for electrical outlet boxes | G. Russell Balkwill, John F. Tamasovics | 1982-08-24 |
| 4296870 | Covers for electrical boxes | G. Russell Balkwill, John F. Tamasovics | 1981-10-27 |