Patent US4001827A successfully refreshed from Google Patents.
US4001827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camouflage material
Assignee: Barracudaverken AB
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Filing: 1976-03-31
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Granted: 1977-01-04
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Expires: 1996-03-31
Abstract
Abstract Laminated, radar-defeating camouflage material for use under snowy, low-temperature conditions without delamination or undue decrease in flexibility at temperatures at least as low as -40° C.
Inventors
- 👤 Erik W. Wallin
- 👤 Gunnar Lindquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:06
CPC Classifications
H; H01; H01Q; H01Q17/00; H01Q17/002; B; B32; B32B; B32B27/00; B32B27/12; F; F41; F41H; F41H3/00; F41H3/02; Y; Y10; Y10S; Y10S428/00; Y10S428/919
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
231 words
In a camouflage material having radar-defeating capabilities and reflectance characteristics relative to visible and near visible electromagnetic radiations suitable for camouflaging under snow conditions, the combination of a flexible web having impedance characteristics which render the same radar-defeating; a first flexible film covering and adhered to one surface of said web, said first film being of a polymeric material and having at least one white pigment distributed therethrough in an amount equal to 5-50% of the total cured weight of said first film; and a second flexible film covering and adhered to said first film, said second film comprising a cured flexible binder heavily loaded with at least one white pigment which is highly reflective to light in the wavelength range of 3000-4000 Angstrom units, individual particles of said at least one white pigment protruding from the exposed surface of said second film but being anchored therein, the difference between the refractive index between said at least one pigment and said binder and the refractive index between said at least one pigment and air being such that said film reflects electromagnetic radiations within substantially the same range of wavelengths and to substantially the same extent as would said at least one pigment alone, said camouflage material being adequately flexible at -40° C. to be draped in camouflaging fashion and being capable of being rolled and unrolled at -40° C. without delamination.
Claim 2
Dependent Claim
231 words
In a camouflage material having radar-defeating capabilities and reflectance characteristics relative to visible and near visible electromagnetic radiations suitable for camouflaging under snow conditions, the combination of a flexible web having impedance characteristics which render the same radar-defeating; a first flexible film covering and adhered to one surface of said web, said first film being of a polymeric material and having at least one white pigment distributed therethrough in an amount equal to 5-50% of the total cured weight of said first film; and a second flexible film covering and adhered to said first film, said second film comprising a cured flexible binder heavily loaded with at least one white pigment which is highly reflective to light in the wavelength range of 3000-4000 Angstrom units, individual particles of said at least one white pigment protruding from the exposed surface of said second film but being anchored therein, the difference between the refractive index between said at least one pigment and said binder and the refractive index between said at least one pigment and air being such that said film reflects electromagnetic radiations within substantially the same range of wavelengths and to substantially the same extent as would said at least one pigment alone, said camouflage material being adequately flexible at -40° C. to be draped in camouflaging fashion and being capable of being rolled and unrolled at -40° C. without delamination.
Claim 3
Dependent Claim
174 words
The combination as defined in claim 1 and further comprising a third flexible film covering and adhered to the other surface of said web, said third film being of polymeric material and having at least one white pigment distributed therethrough in an amount equal to 5-50% of the total cured weight of said third film; and a fourth flexible film covering and adhered to said third film, said fourth film comprising a cured flexible binder heavily loaded with at least one white pigment which is highly reflective to light in the wavelength range of 3000-4000 Angstrom units, individual particles of said at least one pigment protruding from the exposed surface of said fourth film but being anchored therein, the difference between the refractive index between said at least one pigment and said binder and the refractive index between said at least one pigment and air being such that said film reflects electromagnetic radiations within substantially the same range of wavelengths and to substantially the same extent as would said at least one pigment alone.
Claim 4
Dependent Claim
28 words
The combination as defined in claim 2, wherein said flexible web is a non-woven thermally bonded web of thermoplastic polymeric fibers carrying conductive elements on said one surface.
Claim 5
Dependent Claim
28 words
The combination as defined in claim 3, wherein said first flexible film contains significantly more of said at least one white pigment than does said third flexible film.
Claim 6
Dependent Claim
25 words
The combination as defined in claim 1, wherein the white pigment content of said first flexible film comprises a flame retarding amount of antimony trioxide.
Claim 7
Dependent Claim
55 words
The combination as defined in claim 2, wherein the white pigment content of both said first and third films include a significant amount of antimony trioxide, and the white pigment content of said first flexible film includes a white pigment other than antimony trioxide in an amount greater than the antimony trioxide of that film.
Claim 8
Dependent Claim
15 words
The combination as defined in claim 1, wherein said first film is of polyvinyl chloride.
Claim 9
Dependent Claim
17 words
The combination as defined in claim 2, wherein said first and third films are of polyvinyl chloride.
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) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |