US4142387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Identification device
Assignee: Individual
•
Filing: 1977-11-02
•
Granted: 1979-03-06
•
Expires: 1997-11-02
Abstract
Abstract A device for identifying a coded key or the like. A coded key member is inserted into a housing. A Moire interference pattern is produced by a first screen positioned on the key to be moved into registry with a second screen mounted in the housing. The first screen forms non-readable coded information and the second screen forms a code-key. Decoded information produced by the Moire interference pattern is opto-electrically read and a corresponding electrical signal is generated.
Inventors
- 👤 Lars A. Bergkvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:18
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/10831; E; E05; E05B; E05B49/00; E05B49/002; E05B49/006; G06K7/10712; G06K7/10722; G07; G07C; G07C9/00; G07C9/20; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7051; Y10T70/7062; Y10T70/7068; Y10T70/7073
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
143 words
An identification device comprising a housing, a key-like member insertable into the housing, a first screen provided on the member and a second screen mounted in the housing to be in registry with the first screen when the member is inserted into the housing, said screens including a series of line indicia to cooperatively produce a moire inteference pattern when the first screen is moved into registry with the second screen, the indicia lines of the first screen being spaced to form non-readable coded information and the indicia lines of the second screen being spaced to form non-readable code-key information, the moire interference pattern produced by registry of the screens being readable decoded information of the first screen, and means positioned adjacent the two screens for reading the decoded information of the moire pattern and generating a first electrical signal in response thereto.
Claim 2
Dependent Claim
143 words
An identification device comprising a housing, a key-like member insertable into the housing, a first screen provided on the member and a second screen mounted in the housing to be in registry with the first screen when the member is inserted into the housing, said screens including a series of line indicia to cooperatively produce a moire inteference pattern when the first screen is moved into registry with the second screen, the indicia lines of the first screen being spaced to form non-readable coded information and the indicia lines of the second screen being spaced to form non-readable code-key information, the moire interference pattern produced by registry of the screens being readable decoded information of the first screen, and means positioned adjacent the two screens for reading the decoded information of the moire pattern and generating a first electrical signal in response thereto.
Claim 3
Dependent Claim
68 words
An identification device according to claim 1 wherein the means for reading include illumination means positioned adjacent one side of the two screens for illuminating the moire interference as it is produced and a plurality of photo-transistors positioned adjacent the two screens on a side of the two screens opposite the illumination means for detecting the moire interference pattern produced and generating an electrical signal in response thereto.
Claim 4
Dependent Claim
23 words
An identification device according to claim 1 wherein the series of line indicia are arrayed normal to the width of the two screens.
Claim 5
Dependent Claim
34 words
An identification device according to claim 1 wherein the moire interference pattern produced includes a plurality of light portions and a plurality of dark portions corresponding to the decoded information of the first screen.
Claim 6
Dependent Claim
25 words
An identification device according to claim 2 wherein the means for reading move in relation to the screens during scanning of the moire interference pattern.
Claim 7
Dependent Claim
26 words
An identification device according to claim 2 wherein the means for reading are stationary in relation to the screens during scanning of the moire interference pattern.
Claim 8
Dependent Claim
45 words
An identification device according to claim 1 wherein the housing is positioned adjacent a door, and further comprising, means for locking the door positioned at an edge of the door and connected to the electrical signal from the reading means and acting in response thereto.
Claim 9
Dependent Claim
86 words
An identification device according to claim 7 wherein the locking means include means for comparing the information contained in the first electrical signal with predetermined information and generating a second electrical signal in response thereto, switching means responsive to the second electrical signal, electromotive means responsive to said switching means for moving a latch bolt into the edge of the door, and a latch bolt for locking the door positioned in a door jamb and movable into an edge of the door for locking the same.
References Cited (Backward Citations)
US3733862A
Cited
US3797936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-05 | 1982-09-04 | 1983-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-05 | 1986-09-04 | 1987-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-05 | 1990-09-04 | 1991-03-06 | $7700.00 | Window Closed / Lapsed |