Issued Patents All Time
Showing 1–25 of 45 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4998422 | Removable core padlock with bolt retainer | James W. Borgmann | 1991-03-12 |
| 4995249 | Door handle assembly with hollow knob and interchangeable lock core | Christopher M. Preissler | 1991-02-26 |
| 4918950 | High security padlock | — | 1990-04-24 |
| 4873853 | Escutcheon assembly | — | 1989-10-17 |
| 4843852 | Disposable construction core | Duane B. Nixon, Ralph P. Palmer | 1989-07-04 |
| 4836001 | High security lock | — | 1989-06-06 |
| D301116 | Bar lock assembly | Duane B. Nixon | 1989-05-16 |
| 4813254 | Bar lock apparatus | Duane B. Nixon | 1989-03-21 |
| 4779908 | Latch bolt deadlocking mechanism | Lyn E. Hamel | 1988-10-25 |
| 4773240 | Lock with force-override assembly | — | 1988-09-27 |
| 4768360 | Lock for sliding doors or panels | — | 1988-09-06 |
| 4726613 | Fire safety door latch | — | 1988-02-23 |
| 4722204 | Sliding door lock | — | 1988-02-02 |
| D290085 | Key blank | — | 1987-06-02 |
| 4667994 | Frangible spindle | — | 1987-05-26 |
| 4663839 | Cabinet lock | — | 1987-05-12 |
| D289369 | Lever handle or similar article | — | 1987-04-21 |
| 4655059 | Lever handle | Walter E. Best | 1987-04-07 |
| 4655063 | Pick-resistant core | John McCrory | 1987-04-07 |
| 4633690 | Cylinder anchor | — | 1987-01-06 |
| 4616394 | Method of lock capping | Walter E. Best | 1986-10-14 |
| 4589691 | Lever handle mortise lock | Kevin Carey | 1986-05-20 |
| 4572556 | Mortise lock | — | 1986-02-25 |
| 4550581 | Break-away knob driver | Walter E. Best | 1985-11-05 |
| 4531389 | Cabinet lock | — | 1985-07-30 |