Issued Patents All Time
Showing 25 most recent of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12196000 | Cylinder lock with multiple, supplemental locking elements and associated key | Mark Benzie, Douglas E. Trent, Samuel D. Wood, Walter Dannhardt, Thomas Duckwall | 2025-01-14 |
| 12077983 | Key and key blanks operable in vertically and horizontally oriented keyways | Thomas Duckwall, Clyde T. Roberson, Douglas E. Trent | 2024-09-03 |
| 11624206 | Lock cylinder and key with multiple, supplemental locking elements | Mark Benzie, Douglas E. Trent, Samuel D. Wood, Walter Dannhardt, Thomas Duckwall | 2023-04-11 |
| 11280111 | Operating a lock cylinder with multiple, supplemental locking elements | Mark Benzie, Douglas E. Trent, Samuel D. Wood, Walter Dannhardt, Thomas Duckwall | 2022-03-22 |
| 9920551 | Electromechanical cylinder lock | — | 2018-03-20 |
| 9771738 | Flat-bladed key | Glenn Hartman | 2017-09-26 |
| 9482031 | Cylinder lock including multiple cooperating sidebars for controlling the lock | Torsten Quast | 2016-11-01 |
| 9416561 | Cylinder lock configured to be operated by a flat-bladed key | Glenn Hartman | 2016-08-16 |
| 9359793 | Cylinder lock with internal slider and key therefore | Glenn Hartman | 2016-06-07 |
| 9045915 | Key with movable element disposed within key blade | Clyde T. Roberson, Dan Boadwine | 2015-06-02 |
| 8186194 | Cylinder lock and auxiliary locking mechanism | David P. Sutherland, Glenn Hartman, Mark Benzie, Walt Dannhardt, Kevin Galliher +2 more | 2012-05-29 |
| 7895865 | Cylinder lock assembly with a tailpiece rotationally coupled to the cylinder plug | Glenn Hartman, Mark Benzie, Dan Boadwine, Clyde T. Roberson, Doug Trent | 2011-03-01 |
| 7797973 | Hierarchical cylinder lock systems | David P. Sutherland, Clyde T. Roberson | 2010-09-21 |
| 7788956 | Lock, key blank, and key of a hierarchical lock system | Steve Poff | 2010-09-07 |
| 7690231 | Electromechanical cylinder lock | Duncan Robert Kerr | 2010-04-06 |
| 7552608 | Lock, key blank, and key of a hierarchical lock system | Steve Poff | 2009-06-30 |
| 7412860 | Key blank and key | Steve Poff | 2008-08-19 |
| 6945082 | Key blank, key and master keying system | Andy Perkins, Anthony Hicks, Mark Benzie, Glenn Hartman, Clyde T. Roberson +3 more | 2005-09-20 |
| 6578396 | Removable cylindrical lock core | W. Daniel Boadwine | 2003-06-17 |
| 6477875 | Rotating pin tumbler side bar lock with side bar control | Andy Perkins | 2002-11-12 |
| 6382006 | Removable cylindrical lock core | W. Daniel Boadwine | 2002-05-07 |
| 6023954 | Keys for cylinder locks | — | 2000-02-15 |
| 5839307 | Electromechanical cylinder lock with rotary release | Michael Lumpkin | 1998-11-24 |
| 5615565 | Keys for cylinder locks | — | 1997-04-01 |
| 5570601 | Hierarchical cylinder lock and key system | — | 1996-11-05 |