Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12196000 | Cylinder lock with multiple, supplemental locking elements and associated key | Douglas E. Trent, Samuel D. Wood, Peter H. Field, Walter Dannhardt, Thomas Duckwall | 2025-01-14 |
| 11624206 | Lock cylinder and key with multiple, supplemental locking elements | Douglas E. Trent, Samuel D. Wood, Peter H. Field, Walter Dannhardt, Thomas Duckwall | 2023-04-11 |
| 11280111 | Operating a lock cylinder with multiple, supplemental locking elements | Douglas E. Trent, Samuel D. Wood, Peter H. Field, Walter Dannhardt, Thomas Duckwall | 2022-03-22 |
| 10253526 | Dual function lock cylinder assembly operable by different keys | Douglas E. Trent, James Bench, Lance Schoell | 2019-04-09 |
| 8186194 | Cylinder lock and auxiliary locking mechanism | Peter H. Field, David P. Sutherland, Glenn Hartman, Walt Dannhardt, Kevin Galliher +2 more | 2012-05-29 |
| 7895865 | Cylinder lock assembly with a tailpiece rotationally coupled to the cylinder plug | Glenn Hartman, Dan Boadwine, Clyde T. Roberson, Doug Trent, Peter H. Field | 2011-03-01 |
| 6945082 | Key blank, key and master keying system | Peter H. Field, Andy Perkins, Anthony Hicks, Glenn Hartman, Clyde T. Roberson +3 more | 2005-09-20 |