Sargent & Greenleaf, Inc.
62Patents
7Active
62Granted
37Portfolio score
Filing activity: Jul 29, 1974 → May 26, 2016 · 1 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5473922A | Motorized electronic lock | Emerging Cross-Sectional Technologies | 93 | Expired |
| US4961330A | High security panic exit system | Emerging Cross-Sectional Technologies | 85 | Expired |
| US6016677A | Dead bolt combination lock and push-pull lock, each with integrated re-locking features, lock with auxiliary security features, and lock keypad with tamper detection and response features | Emerging Cross-Sectional Technologies | 65 | Expired |
| US4887445A | Electronic lock for hotel room safes and the like | Emerging Cross-Sectional Technologies | 47 | Expired |
| US3953769A | Electronic security control system | Physics | 41 | Expired |
| US6212923A | Lock including means for sensing position of bolt and for indicating whether or not bolt is extended from lock case | Emerging Cross-Sectional Technologies | 34 | Expired |
| US4631940A | Digital readout combination lock dial assembly | Emerging Cross-Sectional Technologies | 33 | Expired |
| US3991596A | Tumbler wheel, changeable combination key lock construction | Emerging Cross-Sectional Technologies | 28 | Expired |
| US4776187A | Changeable key cylinder exposed shackle padlock | Emerging Cross-Sectional Technologies | 27 | Expired |
| US3968667A | Combination lock construction | Emerging Cross-Sectional Technologies | 24 | Expired |
| US6510587B2 | Door closure prevention apparatus and method | Emerging Cross-Sectional Technologies | 23 | Expired |
| US5647235A | Tamper-evident electronic combination lock having integral bearing/retaining member | Emerging Cross-Sectional Technologies | 21 | Expired |
| US5632169A | Self powered electronic combination lock having comprehensive monitoring of power levels for various functions | Emerging Cross-Sectional Technologies | 21 | Expired |
| US6196037A | Lock system enabling user to lock door and extend lock bolt in a single action and push-pull lock with cushioning arrangement for protecting bolt drive components | Emerging Cross-Sectional Technologies | 21 | Expired |
| US4404823A | View limiting dial and ring structure for combination locks and the like | Emerging Cross-Sectional Technologies | 19 | Expired |
| US4241594A | Slide cover type changeable key plug padlock | Emerging Cross-Sectional Technologies | 19 | Expired |
| US4763496A | High security changeable key cylinder type shackle padlock | Emerging Cross-Sectional Technologies | 18 | Expired |
| US5640862A | Electronic combination lock including a sensor arrangement which senses the position and direction of movement of the combination dial | Emerging Cross-Sectional Technologies | 18 | Expired |
| US4083212A | Rotary disc tumbler cylinder lock | Emerging Cross-Sectional Technologies | 17 | Expired |
| US4107965A | Padlock having knuckle type anti-wedge-attack structure | Emerging Cross-Sectional Technologies | 17 | Expired |
| USD262601S | Combined changeable panel handle and hub having locking pin and key lock cylinder for safe doors and the like | General | 16 | Expired |
| US3983728A | Double changeable key lock for safe deposit boxes and the like | Emerging Cross-Sectional Technologies | 15 | Expired |
| US4359886A | Key lock cylinder for possibly contaminated environments | Emerging Cross-Sectional Technologies | 14 | Expired |
| US4462230A | Changeable safe deposit lock with slidable clamped fences | Emerging Cross-Sectional Technologies | 14 | Expired |
| US4455552A | Combination locks with electro-optical silent alarm system | Emerging Cross-Sectional Technologies | 12 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.