Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5855154 | Method of forming large diameter duct with liner and the product formed thereby | Eric G. Schakel, Kent R. Matthews | 1999-01-05 |
| 5697282 | Apparatus for and method of forming large diameter duct with liner and the product formed thereby | Eric G. Schakel, Kent R. Matthews | 1997-12-16 |
| 5567504 | Glass fiber duct board with coated grooves and the method of making the same | Eric G. Schakel, Kent R. Matthews, Lowell K. Morton | 1996-10-22 |
| 5115957 | Apparatus for reinforcing fibrous duct | Harvell M. Smith, Edward John Marx | 1992-05-26 |
| 4781510 | Insulation board feeder | Harvell M. Smith | 1988-11-01 |