US4077242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal magnetic key
Assignee: Individual
•
Filing: 1976-12-15
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Granted: 1978-03-07
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Expires: 1996-12-15
Abstract
Abstract A substantially indestructible magnetic card key having an exterior formed completely of metallic material such as stainless steel. In the preferred form, one side of the key is of magnetizable material and the other of nonmagnetizable material to enhance the operation of the key and simplify its encoding.
Inventors
- 👤 Bruce S. Sedley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:46
CPC Classifications
E; E05; E05B; E05B47/00; E05B47/0038; E05B47/0043; G; G06; G06K; G06K19/00; G06K19/06; G06K19/08; G06K19/10; G06K19/12; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7441; Y10T70/778; Y10T70/7791; Y10T70/7904
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
53 words
A generally planar metal card key comprising: a pair of sheets of metallic material, a planar member of magnetizable material interposed between said sheets and coded with magnetic spots, means fixedly securing said sheets together along their peripheries and clamping said member between said sheets, one of said sheets being of nonmagnetizable material.
Claim 2
Dependent Claim
53 words
A generally planar metal card key comprising: a pair of sheets of metallic material, a planar member of magnetizable material interposed between said sheets and coded with magnetic spots, means fixedly securing said sheets together along their peripheries and clamping said member between said sheets, one of said sheets being of nonmagnetizable material.
Claim 3
Dependent Claim
21 words
A card key according to claim 1 wherein one of said sheets is of nonmagnetizable material and one of magnetizable material.
Claim 4
Dependent Claim
16 words
A card key according to claim 1 wherein both of said sheets are of nonmagnetizable material.
Claim 5
Dependent Claim
108 words
A generally planar metal card key adapted for use with a lock which includes at least one locking pin adapted to be moved from a locking position to an unlocking position by a magnetic spot on such key when the latter is inserted in said lock, said key comprising: a pair of sheets of metallic material, a planar member of magnetizable material interposed between said sheets and coded with at least one magnetic spot in a predetermined location, means fixedly securing said sheets together along their peripheries and clamping said member between said sheets, one of said sheets being of magnetizable metal and the other of nonmagnetizable metal.
Claim 6
Dependent Claim
108 words
A generally planar metal card key adapted for use with a lock which includes at least one locking pin adapted to be moved from a locking position to an unlocking position by a magnetic spot on such key when the latter is inserted in said lock, said key comprising: a pair of sheets of metallic material, a planar member of magnetizable material interposed between said sheets and coded with at least one magnetic spot in a predetermined location, means fixedly securing said sheets together along their peripheries and clamping said member between said sheets, one of said sheets being of magnetizable metal and the other of nonmagnetizable metal.
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) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |