Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5174090 | Grid ceiling | John J. Heichberger | 1992-12-29 |
| 4779394 | Connector for suspension ceiling grid | Richard Shirey, Gerald L. Koski, David F. Mieyal | 1988-10-25 |
| 4312158 | Fire-resistant demountable partition structure | Robert F. Worley | 1982-01-26 |