US3825919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated security window
Assignee: Sierracin Corp
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Filing: 1972-11-16
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Granted: 1974-07-23
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Expires: 1992-11-16
Abstract
Abstract A security window system having a transparent structure having high resistance to penetration is described. A transparent conductive layer is provided over most of the area of the window and the resistance of the layer is monitored for sensing penetration. Preferably the layer is subdivided into a number of conductive regions for substantially increasing the sensitivity of the system to minor interruptions in the layer. Temperature and stress effects can be minimized by connecting different conductive areas of the layer as arms of a resistance bridge. An alarm may be sounded when a small steady state change in resistance is sensed or when a rapid change in resistance is sensed.
Inventors
- 👤 B Levin
- 👤 R Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:59
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/04
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
99 words
A laminated security window comprising: an electrically conductive layer within the laminated window extending over most of the area of the window; a plurality of interruptions in the conductive layer for dividing the conductive layer into a plurality of conductive areas; means for making electrical contact with a pair of edge portions of each of the conductive areas; circuit means for detecting a change in electrical resistance; and means for electrically connecting all of the conductive areas with the circuit means so that the circuit means can detect a change in resistance in any one of the conductive areas.
Claim 2
Dependent Claim
99 words
A laminated security window comprising: an electrically conductive layer within the laminated window extending over most of the area of the window; a plurality of interruptions in the conductive layer for dividing the conductive layer into a plurality of conductive areas; means for making electrical contact with a pair of edge portions of each of the conductive areas; circuit means for detecting a change in electrical resistance; and means for electrically connecting all of the conductive areas with the circuit means so that the circuit means can detect a change in resistance in any one of the conductive areas.
Claim 3
Dependent Claim
19 words
A security window as defined in claim 1 wherein some of thE conductive areas are electrically connected in parallel.
Claim 4
Dependent Claim
19 words
A security window as defined in claim 2 wherein all of the conductive areas are electrically connected in parallel.
Claim 5
Dependent Claim
52 words
A security window as defined in claim 3 wherein the means for making electrical contact comprises: a first bus bar in electrical contact with an edge portion of each of the conductive areas; and a second bus bar in electrical contact with the opposite edge portion of each of the conductive areas.
Claim 6
Dependent Claim
21 words
A security window as defined in claim 2 wherein at least some of the conductive areas are electrically connected in series.
Claim 7
Dependent Claim
21 words
A security window as defined in claim 1 wherein at least some of the conductive areas are electrically connected in series.
Claim 8
Dependent Claim
33 words
A laminated security window as defined in claim 1 further comprising: a frangible ply; and a transparent resilient interlayer between the frangible ply and the electrically conductive layer for inhibiting crack propagation therebetween.
Claim 9
Dependent Claim
48 words
A laminated security window as defined in claim 7 wherein the frangible ply comprises a surface glass ply, the conductive layer comprises a metal film deposited on a transparent plastic carrier film, and wherein the resilient plastic interlayer is interposed between the glass ply and the carrier film.
Claim 10
Dependent Claim
152 words
A laminated security window comprising: a first tempered glass ply on one face of the window; a first transparent plastic interlayer bonded to the first glass ply; a transparent plastic carrier film bonded to the first interlayer; a second transparent plastic interlayer bonded to the carrier film; a rigid, impact resistant transparent plastic ply bonded to the second interlayer; a third transparent plastic interlayer bonded to the rigid plastic ply; a second tempered glass ply on the other face of the window; a transparent electrically conductive layer on the carrier film and substantially coextensive therewith; bus bar means for making electrical contact with opposite edge portions of the conductive layer; and a plurality of interruptions in the conductive layer extending in a direction transverse to the opposite edge portions for dividing the conductive layer into a plurality of conductive areas, each of which is in electrical contact with the bus bar means.
Claim 11
Dependent Claim
152 words
A laminated security window comprising: a first tempered glass ply on one face of the window; a first transparent plastic interlayer bonded to the first glass ply; a transparent plastic carrier film bonded to the first interlayer; a second transparent plastic interlayer bonded to the carrier film; a rigid, impact resistant transparent plastic ply bonded to the second interlayer; a third transparent plastic interlayer bonded to the rigid plastic ply; a second tempered glass ply on the other face of the window; a transparent electrically conductive layer on the carrier film and substantially coextensive therewith; bus bar means for making electrical contact with opposite edge portions of the conductive layer; and a plurality of interruptions in the conductive layer extending in a direction transverse to the opposite edge portions for dividing the conductive layer into a plurality of conductive areas, each of which is in electrical contact with the bus bar means.
Claim 12
Dependent Claim
52 words
A laminated security window as defined in claim 9 wherein the means for making electrical contact comprises: a first bus bar in contact with one edge portion of each of the conductive areas; and a second bus bar in electrical contact with the opposite edge portion of each of the conductive areas.
Claim 13
Dependent Claim
91 words
A security window comprising: a transparent electrically conductive layer extending over most of the area of the window; a first bus bar in electrical contact with an edge portion of the conductive layer; a second bus bar in electrical contact with the opposite edge portion of the conductive layer; a plurality of interruptions in the conductive layer extending in a direction transverse to the first and second bus bars for dividing the conductive layer into a plurality of conductive areas extending in electrical parallel between the first and second bus bars.
Claim 14
Dependent Claim
91 words
A security window comprising: a transparent electrically conductive layer extending over most of the area of the window; a first bus bar in electrical contact with an edge portion of the conductive layer; a second bus bar in electrical contact with the opposite edge portion of the conductive layer; a plurality of interruptions in the conductive layer extending in a direction transverse to the first and second bus bars for dividing the conductive layer into a plurality of conductive areas extending in electrical parallel between the first and second bus bars.
Claim 15
Dependent Claim
58 words
In a laminated security window having a transparent electrically conductive layer within the laminated window and means for making electrical contact with the conductive layer for measuring resistance changes therein, the improvement comprising: a plurality of interruptions in the conductive layer for dividing the conductive layer into a plurality of conductive areas in electrical parallel with each other.
Claim 16
Dependent Claim
58 words
In a laminated security window having a transparent electrically conductive layer within the laminated window and means for making electrical contact with the conductive layer for measuring resistance changes therein, the improvement comprising: a plurality of interruptions in the conductive layer for dividing the conductive layer into a plurality of conductive areas in electrical parallel with each other.
Claim 17
Dependent Claim
110 words
A laminated security window comprising: a transparent electrically conductive layer within the laminated window and extending over most of the area of the window; a plurality of interruptions in the conductive layer for dividing it into a plurality of conductive areas; contact means for making electrical contact along a first edge portion of each of the conductive areas; a first bus bar in electrical contact with second edge portions opposite the contact means for making electrical contact with a plurality of the conductive areas; and a second bus bar in electrical contact with second edge portions opposite the contact means for making electrical contact with another plurality of conductive areas.
Claim 18
Dependent Claim
110 words
A laminated security window comprising: a transparent electrically conductive layer within the laminated window and extending over most of the area of the window; a plurality of interruptions in the conductive layer for dividing it into a plurality of conductive areas; contact means for making electrical contact along a first edge portion of each of the conductive areas; a first bus bar in electrical contact with second edge portions opposite the contact means for making electrical contact with a plurality of the conductive areas; and a second bus bar in electrical contact with second edge portions opposite the contact means for making electrical contact with another plurality of conductive areas.
Claim 19
Dependent Claim
34 words
A security window as defined in claim 13 wherein the means for making electrical contact comprises a third bus bar in electrical contact with the first edge portion of all of the conductive areas.
Claim 20
Dependent Claim
34 words
A security window as defined in claim 14 wherein the third bus bar is within the laminated window and further comprising means for making electrical contact with the third bus bar outside the window.
Claim 21
Dependent Claim
122 words
A security window as defined in claim 13 wherein the means for making electrical contact comprises: a third bus bar in electrical contact with a first edge portion of a pair of the conductive areas, one of said pair being in electrical contact with the first bus bar and the other of said pair being in electrical contact with the second bus bar; a fourth bus bar in electrical contact with a first edge portion of another conductive area having its second edge portion in electrical contact with the first bus bar; and a fifth bus bar in electrical contact with a first edge portion of another conductive area having its second edge portion in electrical contact with the second bus bar.
Claim 22
Dependent Claim
126 words
A laminated security window comprising: a tempered glass ply on one face of the window; a first transparent plastic interlayer bonded to the glass ply; a transparent plastic carrier film bonded to the first interlayer; a second transparent plastic interlayer bonded to the carrier film; a rigid impact resistant transparent plastic ply bonded to the second interlayer; a transparent electrically conductive layer on the carrier film and substantially coextensive therewith; bus bar means for making electrical contact with opposite edge portions of the conductive layer; and a plurality of interruptions in the conductive layer extending in a direction transverse to the edge portions for dividing the conductive layer into a plurality of conductive areas, each of which is in electrical contact with the bus bar means.
Claim 23
Dependent Claim
126 words
A laminated security window comprising: a tempered glass ply on one face of the window; a first transparent plastic interlayer bonded to the glass ply; a transparent plastic carrier film bonded to the first interlayer; a second transparent plastic interlayer bonded to the carrier film; a rigid impact resistant transparent plastic ply bonded to the second interlayer; a transparent electrically conductive layer on the carrier film and substantially coextensive therewith; bus bar means for making electrical contact with opposite edge portions of the conductive layer; and a plurality of interruptions in the conductive layer extending in a direction transverse to the edge portions for dividing the conductive layer into a plurality of conductive areas, each of which is in electrical contact with the bus bar means.
Claim 24
Dependent Claim
52 words
A laminated security window as defined in claim 17 wherein the means for making electrical contact comprises: a first bus bar in contact with one edge portion of each of the conductive areas; and a second bus bar in electrical contact with the opposite edge portion of each of the conductive areas.
Claim 25
Dependent Claim
52 words
A laminated security window as defined in claim 17 wherein the means for making electrical contact includes: a first bus bar in electrical contact with an edge portion of a first group of the conductive areas and a second bus bar in electrical contact with a second group of the conductive areas.
Claim 26
Dependent Claim
56 words
A laminated security window as defined in claim 19 wherein the means for making electrical contact also includes a third bus bar in electrical contact with an edge portion of a third group of conductive areas, said third group including at least one conductive area from each of the first and second groups of conductive areas.
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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |