Peter H. Field
30Patents
14h-index
21Co-inventors
81Inventor score
Filing activity: Oct 31, 1989 → Apr 10, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6477875B2 | Rotating pin tumbler side bar lock with side bar control | Emerging Cross-Sectional Technologies | 84 | Expired |
| US5839307A | Electromechanical cylinder lock with rotary release | Emerging Cross-Sectional Technologies | 55 | Expired |
| US7690231B1 | Electromechanical cylinder lock | Emerging Cross-Sectional Technologies | 43 | Expired |
| US6945082B2 | Key blank, key and master keying system | Emerging Cross-Sectional Technologies | 36 | Expired |
| US6382006B1 | Removable cylindrical lock core | Emerging Cross-Sectional Technologies | 35 | Expired |
| US5088306A | Cylinder lock with changeable keyway | Emerging Cross-Sectional Technologies | 34 | Expired |
| US5570601A | Hierarchical cylinder lock and key system | Emerging Cross-Sectional Technologies | 30 | Expired |
| US5419168A | Hierarchical cylinder lock and key system | Emerging Cross-Sectional Technologies | 30 | Expired |
| US5289709A | Pin tumblers and corresponding keys for cylinder locks | Emerging Cross-Sectional Technologies | 27 | Expired |
| US6578396B2 | Removable cylindrical lock core | Emerging Cross-Sectional Technologies | 26 | Expired |
| US5615565A | Keys for cylinder locks | Emerging Cross-Sectional Technologies | 23 | Expired |
| US6023954A | Keys for cylinder locks | Emerging Cross-Sectional Technologies | 21 | Expired |
| US8186194B2 | Cylinder lock and auxiliary locking mechanism | Emerging Cross-Sectional Technologies | 14 | Active |
| US7797973B2 | Hierarchical cylinder lock systems | Emerging Cross-Sectional Technologies | 14 | Active |
| USD324480S | Dropbolt lock | General | 13 | Expired |
| US5044181A | Dropbolt lock assembly | Emerging Cross-Sectional Technologies | 13 | Expired |
| US9416561B2 | Cylinder lock configured to be operated by a flat-bladed key | Emerging Cross-Sectional Technologies | 9 | Active |
| US7788956B2 | Lock, key blank, and key of a hierarchical lock system | Emerging Cross-Sectional Technologies | 5 | Active |
| US7412860B1 | Key blank and key | Emerging Cross-Sectional Technologies | 5 | Active |
| US9920551B2 | Electromechanical cylinder lock | Emerging Cross-Sectional Technologies | 5 | Active |
| US9045915B2 | Key with movable element disposed within key blade | Emerging Cross-Sectional Technologies | 4 | Active |
| US9359793B2 | Cylinder lock with internal slider and key therefore | Emerging Cross-Sectional Technologies | 4 | Active |
| US7895865B2 | Cylinder lock assembly with a tailpiece rotationally coupled to the cylinder plug | Emerging Cross-Sectional Technologies | 3 | Active |
| US9482031B2 | Cylinder lock including multiple cooperating sidebars for controlling the lock | Fixed Constructions | 3 | Active |
| US7552608B2 | Lock, key blank, and key of a hierarchical lock system | Emerging Cross-Sectional Technologies | 2 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.