US4521767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite strip
Assignee: REMSDAQ Ltd
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Filing: 1981-06-18
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Granted: 1985-06-04
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Expires: 2001-06-18
Abstract
Abstract A composite strip for use in a security system comprises an integrally barbed or serrated carrier strip having a longitudinal groove therein. A fibre-optic filament is disposed in the groove and is held therein by means of an adhesive strip which is applied to the carrier strip so as to overlie the groove. Such a composite strip may provide security against unauthorized crossing of a boundary by directing light into one end of the filament and detecting the light leaving the other end of the filament. An indication is given when the optical intensity of the detected light falls below a predetermined threshold, so as to warn when the fibre-optic filament has been disturbed significantly or cut through.
Inventors
- 👤 Richard F. Bridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:14
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/12; G08B13/122; G08B13/124; G08B13/18; G08B13/181; G08B13/183; G08B13/186
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
76 words
A composite strip comprising a metal carrier strip having a main portion, means forming a longitudinal groove in said main portion, a plurality of metal barbs or serrations which extend from said main portion and are integral therewith, a fibre-optic filament disposed in said groove, and an adhesive strip applied to the main portion only of the carrier strip so as to overlie said groove and cover the fibre-optic filament without covering said barbs or serrations.
Claim 2
Dependent Claim
76 words
A composite strip comprising a metal carrier strip having a main portion, means forming a longitudinal groove in said main portion, a plurality of metal barbs or serrations which extend from said main portion and are integral therewith, a fibre-optic filament disposed in said groove, and an adhesive strip applied to the main portion only of the carrier strip so as to overlie said groove and cover the fibre-optic filament without covering said barbs or serrations.
Claim 3
Dependent Claim
28 words
A composite strip as claimed in claim 1 in which the adhesive strip has longitudinal edges which are disposed inwardly of longitudinal edges of the said main portion.
Claim 4
Dependent Claim
31 words
A composite strip as claimed in claim 1 or 2 in which the fibre-optic filament is held within the groove by a bonding agent, the adhesive strip overlying the bonding agent.
Claim 5
Dependent Claim
15 words
A strip according to claim 3 wherein the bonding agent is a two-part flexible resin.
Claim 6
Dependent Claim
16 words
A strip according to claim 1 or 2 wherein the carrier strip is made of steel.
Claim 7
Dependent Claim
22 words
A strip according to claim 1 or 2 wherein the carrier strip is made of a galvanized strip painted with plastics-based paint.
Claim 8
Dependent Claim
17 words
A strip according to claim 1 or 2 wherein the filament is enclosed in a plastics sheathing.
Claim 9
Independent Claim
73 words
A method of making a composite strip comprising positioning a fibre-optic filament within a longitudinal groove formed in a main portion of a metal carrier strip which has metal barbs or serrations which extend from said main portion and are integral therewith, and securing an adhesive strip to the main portion only of the carrier strip so as to overlie said groove and cover the fibre-optic filament without covering said barbs or serrations.
Claim 10
Independent Claim
73 words
A method of making a composite strip comprising positioning a fibre-optic filament within a longitudinal groove formed in a main portion of a metal carrier strip which has metal barbs or serrations which extend from said main portion and are integral therewith, and securing an adhesive strip to the main portion only of the carrier strip so as to overlie said groove and cover the fibre-optic filament without covering said barbs or serrations.
Claim 11
Dependent Claim
28 words
A method as claimed in claim 8 comprising holding the filament within the groove by a bonding agent, and arranging the adhesive strip to overlie the bonding agent.
Claim 12
Independent Claim
114 words
A method of making and reeling a composite strip comprising positioning a fibre-optic filament within a longitudinal groove formed in a main portion of a metal carrier strip which has metal barbs or serrations which extend from said main portion and are integral therewith, holding the filament within the groove by a bonding agent, securing an adhesive strip to the main portion only of the carrier strip so as to overlie said groove and cover the fibre-optic filament and bonding agent without covering said barbs or serrations, and winding the composite strip so formed onto a reel, the adhesive strip preventing successive turns on the reel from becoming bonded together by the bonding agent.
Claim 13
Independent Claim
114 words
A method of making and reeling a composite strip comprising positioning a fibre-optic filament within a longitudinal groove formed in a main portion of a metal carrier strip which has metal barbs or serrations which extend from said main portion and are integral therewith, holding the filament within the groove by a bonding agent, securing an adhesive strip to the main portion only of the carrier strip so as to overlie said groove and cover the fibre-optic filament and bonding agent without covering said barbs or serrations, and winding the composite strip so formed onto a reel, the adhesive strip preventing successive turns on the reel from becoming bonded together by the bonding agent.
Claim 14
Dependent Claim
82 words
A security system having at least one composite strip comprising a metal carrier strip having a main portion, means forming a longitudinal groove in said main portion, a plurality of metal barbs or serrations which extend from said main portion and are integral therewith, a fibre-optic filament disposed in said groove, and an adhesive strip applied to the main portion only of the carrier strip so as to overlie said groove and cover the fibre-optic filament without covering said barbs or serrations.
Claim 15
Dependent Claim
82 words
A security system having at least one composite strip comprising a metal carrier strip having a main portion, means forming a longitudinal groove in said main portion, a plurality of metal barbs or serrations which extend from said main portion and are integral therewith, a fibre-optic filament disposed in said groove, and an adhesive strip applied to the main portion only of the carrier strip so as to overlie said groove and cover the fibre-optic filament without covering said barbs or serrations.
Claim 16
Dependent Claim
195 words
A security system comprising a plurality of spaced apart supports disposed to extend along a given boundary; a first strand running along the boundary and supported by said supports, said first strand comprising a metal carrier strip having a main portion, means forming a longitudinal groove in said main portion, a plurality of metal barbs or serrations which extend from said main portion and are integral therewith, a fibre-optic filament disposed in said groove, and an adhesive strip applied to the main portion only of the carrier strip so as to overlie said groove and cover the fibre-optic filament without covering said barbs or serrations; an energy source positioned to direct optical radiation along said fibre optic filament from one end; a detector positioned to detect radiation leaving said fibre optic filament from the other end and arranged to change the state thereof in response to a change in detected radiation outside a predetermined range; and a dummy strand which is supported by said supports but is otherwise unconnected to and is spaced from the first strand, said dummy strand being of identical appearance externally to the first strand but not including any fibre-optic filament.
Claim 17
Dependent Claim
195 words
A security system comprising a plurality of spaced apart supports disposed to extend along a given boundary; a first strand running along the boundary and supported by said supports, said first strand comprising a metal carrier strip having a main portion, means forming a longitudinal groove in said main portion, a plurality of metal barbs or serrations which extend from said main portion and are integral therewith, a fibre-optic filament disposed in said groove, and an adhesive strip applied to the main portion only of the carrier strip so as to overlie said groove and cover the fibre-optic filament without covering said barbs or serrations; an energy source positioned to direct optical radiation along said fibre optic filament from one end; a detector positioned to detect radiation leaving said fibre optic filament from the other end and arranged to change the state thereof in response to a change in detected radiation outside a predetermined range; and a dummy strand which is supported by said supports but is otherwise unconnected to and is spaced from the first strand, said dummy strand being of identical appearance externally to the first strand but not including any fibre-optic filament.
References Cited (Backward Citations)
US3110891A
Cited
US3454261A
Cited
US3623057A
Cited
US3688298A
Cited
US3714644A
Cited
US3938124A
Cited
US3898639A
Cited
US3825916A
Cited
US4090902A
Cited
US4029390A
Cited
US4207561A
Cited
US4028081A
Cited
US4147407A
Cited
US4275294A
Cited
US4144530A
Cited
US4307386A
Cited
GB2039683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |