Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4377926 | Framing member for curtain wall structures | Ellwin L. Coulston | 1983-03-29 |
| 4339901 | System for improving heat insulating characteristics of a building wall structure | — | 1982-07-20 |
| 4290233 | Safety door entrance | — | 1981-09-22 |
| 4283882 | Safety flush bolt entrance door system | Richard A. Meisterheim, Ernest B. Symon | 1981-08-18 |
| 4250673 | Window replacement system | — | 1981-02-17 |
| 4243018 | Solar energy concentrator | — | 1981-01-06 |
| 4225163 | Panic device actuator | Richard A. Meisterheim | 1980-09-30 |
| 4207717 | System for improving heat insulating characteristics of existing curtain walls and the like | — | 1980-06-17 |
| 4204369 | Entrance door system with automatic astragal and panic device | — | 1980-05-27 |