Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5575312 | Fire retarding heating and cooling duct | — | 1996-11-19 |
| 5393106 | Sealed knock-down duct collar | — | 1995-02-28 |
| 5167260 | Duct core with strengthening tape | Ralph L. Fogg | 1992-12-01 |
| 5121969 | Adjustable head rest for lounges | — | 1992-06-16 |
| 4801316 | Molded fiberglass air return filter grille | — | 1989-01-31 |
| 4713099 | Molded fiberglass air return filter grille | — | 1987-12-15 |
| 4508370 | Rigid duct with bendable elbow | — | 1985-04-02 |
| 4478657 | Method for strengthening duct cores | Ralph L. Fogg | 1984-10-23 |
| 4400863 | Method of making a rigid fiberglass duct having an integral bendable elbow | — | 1983-08-30 |
| 4266470 | Universal air diffuser | Ralph L. Fogg, Harry J. Farason, Robert E. Voorhees | 1981-05-12 |