US3705369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Key actuated switch
Assignee: Individual
•
Filing: 1971-11-01
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Granted: 1972-12-05
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Expires: 1991-11-01
Abstract
Abstract Switch means incorporating means to energize an electric circuit upon use of a key of predetermined characteristics but which will energize an alarm system upon use of an improper key, or fail to work at all.
Inventors
- 👤 Wayne C Schwendeman Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:46
CPC Classifications
H; H01; H01H; H01H27/00; H01H27/06; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7441; Y10T70/778; Y10T70/7791; Y10T70/7904
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
An electric switch comprising a lock cylinder, a plurality of normally open magnetic switches spaced along and surrounding said lock cylinder, a key, a permanent magnet carried by said key, a spiral key-way slot in said key, and a pin on said lock cylinder engaged in said key-way and effective to cause the key to rotate during its insertion into the lock cylinder to carry the magnet into close association with a selected one of the switches for closing same when the key is fully positioned in said lock cylinder.
Claim 2
Dependent Claim
90 words
An electric switch comprising a lock cylinder, a plurality of normally open magnetic switches spaced along and surrounding said lock cylinder, a key, a permanent magnet carried by said key, a spiral key-way slot in said key, and a pin on said lock cylinder engaged in said key-way and effective to cause the key to rotate during its insertion into the lock cylinder to carry the magnet into close association with a selected one of the switches for closing same when the key is fully positioned in said lock cylinder.
Claim 3
Dependent Claim
16 words
The switch recited in claim 1, in which the switches are mounted on the lock cylinder.
Claim 4
Dependent Claim
15 words
The switch recited in claim 1, in which the key comprises a solid cylindrical body.
Claim 5
Dependent Claim
16 words
The switch recited in claim 3, in which the magnet is embedded in the cylindrical body.
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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |