US3643756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety circuit control device
Assignee: Pilkington North America Inc
•
Filing: 1969-12-16
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Granted: 1972-02-22
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Expires: 1989-12-16
Abstract
Abstract This application discloses an automatic safety switch in the form of a strip of silver-frit fired onto a margin of one of the glass sheets in the windshield of an automobile and interposed in the ignition circuit so that breaking of the windshield will cut off all electrical systems, thus stopping the engine and eliminating possible fire, shock and similar hazards.
Inventors
- 👤 Ivan L Soreghy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:44
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/14; H01H35/146
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
57 words
The combination with an automotive vehicle including a source of electrical power, an ignition circuit connected to said source, and a transparent glazing panel; of an automatic safety switch interposed in said circuit and comprising a frangible and readily separable strip of conducting material on and covering only a minor area of a surface of said panel.
Claim 2
Dependent Claim
57 words
The combination with an automotive vehicle including a source of electrical power, an ignition circuit connected to said source, and a transparent glazing panel; of an automatic safety switch interposed in said circuit and comprising a frangible and readily separable strip of conducting material on and covering only a minor area of a surface of said panel.
Claim 3
Dependent Claim
36 words
Apparatus as defined in claim 1 in which said glazing panel is a laminated windshield including glass and plastic layers bonded together in face to face relation, and said strip is located between said bonded layers.
Claim 4
Dependent Claim
21 words
Apparatus as defined in claim 1 in which said strip comprises a layer of finely divided metal adhered to said surface.
Claim 5
Dependent Claim
30 words
Apparatus as defined in claim 3 in which said panel includes a sheet of glass, and said strip comprises a layer of metal-frit fired onto a surface of said sheet.
Claim 6
Dependent Claim
27 words
Apparatus as defined in claim 1 in which said strip is positioned adjacent an edge of said panel, and said bypassing means includes a manually operable switch.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |