Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4850078 | Adjustable roller assembly for sliding doors | Scott A. Libby, Frank V. Pliml, Jr., William M. Johnson, Laurence P. Armstrong | 1989-07-25 |
| 4843775 | Square butt door frame and method of assembly | Laurence P. Armstrong, Scott A. Libby, Roger Norberg | 1989-07-04 |