Safety lock with provision for key user identification
Abstract
Abstract A LOCK INCLUDES A DEVIDE CAPABLE OF PRODUCING DISTINCTLY DIFFERENT ELECTRICAL SIGNALS IN RESPONSE TO THE KEY EMPLOYED TO OPERATE THE LOCK. THE KEYS CAPABLE OF OPERATING THE LOCK ARE SUBSTANTIALLY IDENTICAL IN ALL DETAILS EXCEPT FOR THE DEPTH OF O NE SIGNATURE NOTCH. THE OUTPUT SIGNAL PRODUCED BY THE DEVICE IS IN TURN PROPORTIONAL TO THE DEPTH OF THE SIGNATURE NOTCH OF THE OPERATING KEY. IN THE EMBODIMENT SHOWN, THE SIGNAL PRODUCING DEVICE INCLUDES A MAGNETIC MEMBER MOVABLE WITHIN THE LOCK BY AN EXTENT CORRESPONDING TO THE DEPTH OF THE SIGNATURE NOTCH, AND A FIXED TRANSDUCING ELEMENT CAPABLE OF PRODUCING AN OUTPUT SIGNAL PROPORTIONAL TO THE RELATIVE POSITION OF THE MOVABLE MAGNETIC MEMBER. ALSO DISCLOSED IS A SYSTEM EMPLOYING THE LOCK TO PREVENT ACCESS OF CERTAIN INDIVIDUALS INTO THE PROTECTED PREMISES ONLY AT CERTAIN TIMES OF THE DAY.
Inventors
- 👤 A Miller
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |