Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4884835 | Lever spindle spring cage | Richard R. Bettger | 1989-12-05 |
| 4875352 | Construction keying | Richard R. Bettger | 1989-10-24 |
| 4834432 | Dual backset latch | Keith L. Mathews | 1989-05-30 |