Patent US3772650A successfully refreshed from Google Patents.
US3772650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control and response systems and units
Assignee: Fidelity Bank NA
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Filing: 1973-02-01
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Granted: 1973-11-13
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Expires: 1993-02-01
Abstract
Abstract A coded signal system particularly useful for operating locks in a security institution comprising a portable signaling unit capable of activating a number of response units at various lock locations. The signaling unit comprises a matrix of lights in spatial arrangement which are electrically energized by corresponding selectively operable switches according to a different predetermined coded combination for each response unit. Each response unit comprises a matrix of photoconductive cells in spatial arrangement corresponding to that of the lights of the signaling unit and operatively conductive in response to illumination therefrom, the photoconductive cells being arranged in circuits to operate the lock only when all of a predetermined coded combination of photoconductive cells are illuminated, and to prevent activation of the lock whenever any other photoconductive cells are illuminated, thereby preventing unauthorized operation of the lock by use of an external light such as a flashlight.
Inventors
- 👤 J Baskerville
- 👤 C Creekman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:43
CPC Classifications
G; G07; G07C; G07C9/00; G07C9/00174; G07C9/00182; G07C2009/00753; G07C2009/00769; G07C2009/00785; G07C9/00658; G07C9/00674
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
252 words
A coded signal system comprising: signaling means having a plurality of selectively operable switches, a source of electrical energy and a plurality of light generating means in spatial arrangement, all in a circuit for simultaneously activating selected ones of said plurality of light generating means by energization from said source; response means having a first plurality of light responsive conducting means in series circuit arrangement, a second plurality of light responsive conducting means in parallel circuit arrangement, each of said light responsive conducting means being spatially located opposite a corresponding one of said light generating means and operatively conductive in response to illumination therefrom when said signaling means is operatively positioned relative to said response means; a source of electrical energy, and an activation relay in circuit with said first plurality and said source and operable to connect said source to a desired load in response to illumination of all of said first plurality of light responsive conducting means, and an inhibiting relay in circuit with said second plurality and said source and operable to isolate said source from said load in response to illumination of any of said second plurality of light responsive conducting means; whereby said load is energized only in response to simultaneous operation of a predetermined coded combination of said switches for energizing light generating means corresponding to said first plurality of light responsive conducting means, and is isolated from said source in response to operaof any other of said switches to prevent unauthorized energization of said load.
Claim 2
Dependent Claim
252 words
A coded signal system comprising: signaling means having a plurality of selectively operable switches, a source of electrical energy and a plurality of light generating means in spatial arrangement, all in a circuit for simultaneously activating selected ones of said plurality of light generating means by energization from said source; response means having a first plurality of light responsive conducting means in series circuit arrangement, a second plurality of light responsive conducting means in parallel circuit arrangement, each of said light responsive conducting means being spatially located opposite a corresponding one of said light generating means and operatively conductive in response to illumination therefrom when said signaling means is operatively positioned relative to said response means; a source of electrical energy, and an activation relay in circuit with said first plurality and said source and operable to connect said source to a desired load in response to illumination of all of said first plurality of light responsive conducting means, and an inhibiting relay in circuit with said second plurality and said source and operable to isolate said source from said load in response to illumination of any of said second plurality of light responsive conducting means; whereby said load is energized only in response to simultaneous operation of a predetermined coded combination of said switches for energizing light generating means corresponding to said first plurality of light responsive conducting means, and is isolated from said source in response to operaof any other of said switches to prevent unauthorized energization of said load.
Claim 3
Dependent Claim
17 words
The invention according to claim 1, wherein each said light responsive conducting means comprises a photoconductive cell.
Claim 4
Dependent Claim
28 words
The invention according to claim 1, wherein said signaling means comprises a hand-held portable unit capable of actuating a plurality of said response means at various fixed locations.
Claim 5
Dependent Claim
39 words
The invention according to claim 1, wherein said inhibiting relay comprises latching means and a control solenoid therefor, whereby said latching means maintains said load isolated from said source until said latching means is released by said control solenoid.
Claim 6
Dependent Claim
57 words
The invention according to claim 1, wherein each said light generAting means is operable to emit light at a different frequency according to a predetermined code, and each light responsive conducting means of said first plurality is operatively conductive in response to illumination from a corresponding one of said light generating means only at a particular frequency.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |