Patent US3552159A successfully refreshed from Google Patents.
US3552159A
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US
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Magnetic key and lock
Assignee: Valhi Inc
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Filing: 1969-03-05
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Granted: 1971-01-05
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Expires: 1989-03-05
Abstract
Abstract A KEY AND PADLOCK COMBINATION COMPRISED OF A HOUSING, BOW, LOCKING MECHANISM AND MAGNETIZED KEY. THE LOCKING MECHANISM INCLUDES A CYLINDER RECEIVED WITHIN THE HOUSING AND A BOLT CARRIED BY THE CYLINDER FOR MOVEMENT INTO AND OUT OF LOCKING ENGAGEMENT WITH NOTCHES IN THE BOW. A PLURALITY OF ROTATABLE MAGNETIC TUMBLERS ARE CARRIED WITHIN THE CYLINDER TO NORMALLY HOLD THE BOLT IN THE LOCKED CONDITION. WHEN THE KEY IS INSERTED INTO A KEYWAY IN THE CYLINDER, THE TUMBLERS ARE ROTATIONALLY ALIGNED BY THE MAGNETIC FIELD OF THE KEY IN SUCH A WAY AS TO PERMIT DISENGAGEMENT OF THE BOLT FROM THE BOW, THEREBY UNLOCKING THE PADLOCK.
Inventors
- 👤 Clark E Craig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:19
CPC Classifications
E; E05; E05B; E05B47/00; E05B47/0038; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7051; Y10T70/7057; Y10T70/7441; Y10T70/7486; Y10T70/7508; Y10T70/7537; Y10T70/7559; Y10T70/7582; Y10T70/7588; Y10T70/7627; Y10T70/778; Y10T70/7791; Y10T70/7904
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |