Patent US3863242A successfully refreshed from Google Patents.
US3863242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric screen protection
Assignee: Individual
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Filing: 1972-12-07
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Granted: 1975-01-28
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Expires: 1992-12-07
Abstract
Abstract Projections having sharp edges are struck out of the peripheral frame of a screen. An electrical conductor is attached to plural projections and traverses the screen, so that a nominal physical force exerted upon the conductor will cause it to break at a sharp projection. A circuit is connected to the conductor to actuate an alarm upon the conductor being broken.
Inventors
- 👤 James W Minton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:09
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/12; G08B13/126
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
In a normally closed protective circuit having alarm means responsive to opening said circuit, the combination comprising; a. a substantially planar screen frame (1) having a mesh screen (2) with wires, b. separate strip-like projection-carrying means (3 or 3'') peripherally attached to said screen frame and having a plurality of spaced sharp projections (6), few with respect to the number of said wires, and c. a single electrical conductor (7) included in said circuit, threaded totally across but separate from said mesh screen between said projections, lying in a plane parallel to that of said mesh screen, and electrically insulated therefrom, whereby physical displacement of said conductor causes it to be severed by at least one of said sharp projections.
Claim 2
Dependent Claim
120 words
In a normally closed protective circuit having alarm means responsive to opening said circuit, the combination comprising; a. a substantially planar screen frame (1) having a mesh screen (2) with wires, b. separate strip-like projection-carrying means (3 or 3'') peripherally attached to said screen frame and having a plurality of spaced sharp projections (6), few with respect to the number of said wires, and c. a single electrical conductor (7) included in said circuit, threaded totally across but separate from said mesh screen between said projections, lying in a plane parallel to that of said mesh screen, and electrically insulated therefrom, whereby physical displacement of said conductor causes it to be severed by at least one of said sharp projections.
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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |