US3936662A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interlocking system with a number of individual key elements
Assignee: Tetra Pak AB
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Filing: 1974-01-14
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Granted: 1976-02-03
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Expires: 1994-01-14
Abstract
Abstract An interlocking system includes a number of individual key elements such as an identity card each of which has a pre-determined code marking consisting of a number of index elements arranged to form a pattern. At least one interlocking device adapted to co-operate with the key elements includes a release element sensitive to radiation as a function of the radiation pattern pre-determined by the code marking on the key element. The interlocking device comprises a radio-active radiation source, a detector and means such as a slot for interposing the coded key element between the radiation source and the detector.
Inventors
- 👤 Anders Ruben Rausing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:22
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G01; G01V; G01V15/00; G06K19/00; G06K19/06; G06K19/08; G06K19/10; G06K19/14; G07; G07C; G07C9/00; G07C9/00174; G07C9/00658; G07F; G07F7/00; G07F7/08; G07F7/086
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
In an interlocking system actuatable by any one of a plurality of differently coded key elements, said system comprising an interlocking device including a radio-active source of radiation, a radiation code detector having its input side located in spaced relation to said radiation source, a release element connected to the output side of said code detector and means for receiving the coded key elements between said radiation source and said code detector, the improvement wherein each said coded key element comprises a sheet of plastic material, the portions of said sheet opaque to the radiation being established by a coating of a chemical compound incorporating a heavy metal and the portions of said sheet transparent to the radiation and representing the code pattern being established by a different coating but which has a visual appearance similar to that of the opaque coating so that the sheet of plastic material appears homogeneous throughout its surface and thereby in effect makes the code pattern invisible.
Claim 2
Dependent Claim
163 words
In an interlocking system actuatable by any one of a plurality of differently coded key elements, said system comprising an interlocking device including a radio-active source of radiation, a radiation code detector having its input side located in spaced relation to said radiation source, a release element connected to the output side of said code detector and means for receiving the coded key elements between said radiation source and said code detector, the improvement wherein each said coded key element comprises a sheet of plastic material, the portions of said sheet opaque to the radiation being established by a coating of a chemical compound incorporating a heavy metal and the portions of said sheet transparent to the radiation and representing the code pattern being established by a different coating but which has a visual appearance similar to that of the opaque coating so that the sheet of plastic material appears homogeneous throughout its surface and thereby in effect makes the code pattern invisible.
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) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |