Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 5704234 | Cylinder lock incorporating a slam resistance pad | — | 1998-01-06 | $1,635,000 |
| 5611225 | Breakaway cylinder head | David C. Janssen | 1997-03-18 | $1,010,000 |
| 5171049 | Key-in knob door assembly with notched turn bar self-aligning button and installation catches | Kenneth N. Grandy | 1992-12-15 |