Patent US3793565A successfully refreshed from Google Patents.
US3793565A
Expired / Lapsed
US
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Polarized light-controlled combination door lock
Assignee: Individual
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Filing: 1972-09-11
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Granted: 1974-02-19
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Expires: 1992-09-11
Abstract
Abstract A plastic device somewhat similar to a credit card has a series of windows with polarized lens therein. Each lens is oriented in a unique manner according to a numerical code known to the card user. When the card is inserted into a door lock, the user sets one or more dials on a polarized reader. If the dial settings are in proper sequence and correspond to the polarized orientation of the credit card lens, a suitable signal enables a door to be opened for a predetermined time period. If the dials are set in a different sequence, a door is locked and an alarm is given.
Inventors
- 👤 G Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:45
CPC Classifications
E; E05; E05B; E05B49/00; E05B49/002; E05B49/006; G; G07; G07C; G07C9/00; G07C9/00174; G07C9/00658; G07C9/00666; G07C9/20; G07C9/22; G07C9/23
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
88 words
A lock comprising non-contacting key means uniquely coded to identify a user, key means comprising card means having a plurality of windows therein, each window having a polarized light filter therein, said polarized filters being oriented to form said code, a plurality of discrete operator means each comprising a polarized filter individually associated with said windows which operators must be individually operated according to said unique user code, and means for establishing a sequence in which said operator means must be operated in order to open said lock.
Claim 2
Dependent Claim
88 words
A lock comprising non-contacting key means uniquely coded to identify a user, key means comprising card means having a plurality of windows therein, each window having a polarized light filter therein, said polarized filters being oriented to form said code, a plurality of discrete operator means each comprising a polarized filter individually associated with said windows which operators must be individually operated according to said unique user code, and means for establishing a sequence in which said operator means must be operated in order to open said lock.
Claim 3
Dependent Claim
14 words
The lock of claim 1 and means for changing the sequence for different users.
Claim 4
Dependent Claim
30 words
The lock of claim 2 wherein said sequence changing means comprises means for changing a configuration of wiring between means associated with said filters and a reader of said code.
Claim 5
Dependent Claim
18 words
The lock of claim 3 wherein said configuration changing means comprises at least one changeable cross-wired wheel means.
Claim 6
Dependent Claim
42 words
The lock of claim 1 and means for detecting when a bolt in said lock is in a locking position, and for giving an alarm if said bolt is out of said locked position for more than a predetermined period of time.
Claim 7
Dependent Claim
19 words
The lock of claim 1 and means for giving a burglar alarm if a predetermined operator sequence is followed.
Claim 8
Dependent Claim
27 words
The lock of claim 6 and means for maintaining a locked condition for a predetermined period of time following said burglar alarm and thereafter unlocking said lock.
Claim 9
Dependent Claim
21 words
The lock of claim 1 and means for giving a local alarm if said operators are operated in an improper sequence.
Claim 10
Dependent Claim
25 words
The lock of claim 1 and means for selecting a sequence of operator operations and means for parity checking the key and sequence selecting means.
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |