US4038637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Access control system
Assignee: Individual
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Filing: 1975-11-24
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Granted: 1977-07-26
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Expires: 1995-11-24
Abstract
Abstract A system for controlling access which comprises, at a control point, storage means such as a plurality of decimal switches into which can be stored a series of decimal digits. At a second point where access is desired, there is a single decimal switch which controls an oscillator to create a coded signal containing a plurality of pulses, representative of the decimal digit selected by the switch. This coded signal is transmitted to the control point, where it is decoded. If it corresponds to the decimal digit inserted in the first storage switch, a latch is set. A sequence of coded signals are generated, transmitted, and decoded. Corresponding latches are set at the control point if each signal corresponds to the corresponding decimal switch setting. When a full sequence of signals is completed and alllatches are set, then access is gained. Failure to transmit the correct signal or to use the signals in an incorrect order will fail to set all the latches, and access will be refused.
Inventors
- 👤 Sherman M. Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:46
CPC Classifications
G; G07; G07F; G07F7/00; G07F7/08; G07F7/0866; G07C; G07C9/00; G07C9/20; G07C9/29
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
259 words
A system for access control comprising; a. storage means at a control location, and means for entering into said storage means signals representative of a first selected series of decimal digits, said storage means being decimal switch means; b. means at an access location for generating a plurality of sequential signals, which comprises clock means, means to start said clock means; means to count the pulses produced by said clock means, comprising binary counter means; binary to decimal converter means; decimal switch means; and means responsive to said switch means to stop said clock means when said number of pulses corresponds to a selected decimal digit; each signal comprising a plurality of sequential electrical pulses, the number of pulses in each signal corresponding to the sequential digits in second selected series of decimal digits; c. means to transmit said sequential pulses of each of said sequential signals from said access location to said control location over a signal conductor; d. means including binary counter means and binary to decimal converter means for converting said sequential pulses of said sequential signals to sequential decimal digits corresponding to said second selected series of decimal digits; and e. means to compare said sequential decimal digits corresponding to said second selected series of decimal digits to said first selected series to decimal digits; f. means responsive to said means to compare, to set each of a plurality of latches, one for each of said sequential digits; and g. means responsive to said plurality of latches, set in the proper order, for granting access.
Claim 2
Independent Claim
259 words
A system for access control comprising; a. storage means at a control location, and means for entering into said storage means signals representative of a first selected series of decimal digits, said storage means being decimal switch means; b. means at an access location for generating a plurality of sequential signals, which comprises clock means, means to start said clock means; means to count the pulses produced by said clock means, comprising binary counter means; binary to decimal converter means; decimal switch means; and means responsive to said switch means to stop said clock means when said number of pulses corresponds to a selected decimal digit; each signal comprising a plurality of sequential electrical pulses, the number of pulses in each signal corresponding to the sequential digits in second selected series of decimal digits; c. means to transmit said sequential pulses of each of said sequential signals from said access location to said control location over a signal conductor; d. means including binary counter means and binary to decimal converter means for converting said sequential pulses of said sequential signals to sequential decimal digits corresponding to said second selected series of decimal digits; and e. means to compare said sequential decimal digits corresponding to said second selected series of decimal digits to said first selected series to decimal digits; f. means responsive to said means to compare, to set each of a plurality of latches, one for each of said sequential digits; and g. means responsive to said plurality of latches, set in the proper order, for granting access.
Claim 3
Dependent Claim
17 words
The system as in claim 1 in which said means for granting access includes electromagnetic lock means.
Claim 4
Dependent Claim
21 words
The system as in claim 1 in which said latch means is responsive to the sequence of said sequential decimal digits.
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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |