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US3594770A Expired / Lapsed US ⏱️ 0.0 years remaining

Printed-circuit type security apparatus for protecting areas

Assignee: Lewis Engineering Co
•
Filing: 1968-10-28
•
Granted: 1971-07-20
•
Expires: 1988-10-28
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Abstract

Abstract A guarding apparatus responsive to violation of the security of an area or space, comprising a printed or similar gridlike circuit configuration of conductors, preferably of resistance characteristic, connected to form one or several continuous trigger circuits. The configuration may be in the nature of printed circuit panels arranged to enclose, preferably completely, the desired area of security, as by constituting part of the walls, floor, junction or connector boxes and the like. The circuitry is connected, as by a cable, to an energized electrical detector which may comprise an instrument movement and a bridge, whereby any shorting or breaking of one or more of the printed or similar conductors will result in a response by the instrument movement.

Inventors

  • 👤 Conrad S Ham
  • 👤 Elwood R Horwinski

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 05:02
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/12; G08B13/126

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 41 words
An apparatus as in claim 1 wherein: a. the grid comprises four independent circuits, b. said detection circuit comprising an electrical bridGe, c. said four independent circuits of the wire mesh being connected respectively in the four legs of the bridge.
Claim 2
Dependent Claim 44 words
An apparatus as in claim 2, wherein: a. two of the independent circuits of the grid comprise conductors on one side of the sheet, b. the remaining two of the independent circuits of the grid comprising conductors on the other side of the sheet.
Claim 3
Dependent Claim 29 words
An apparatus as in claim 1, wherein: a. the grid comprises a single continuous circuit constituted of insulated sets of conductors disposed on opposite sides of the insulating sheet.

References Cited (Backward Citations)

US3133773A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-07-19 1975-01-18 1975-07-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-07-19 1979-01-18 1979-07-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-07-19 1983-01-18 1983-07-20 $7700.00 Window Closed / Lapsed

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