US4594285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible membrane material
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1984-10-22
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Granted: 1986-06-10
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Expires: 2004-10-22
Abstract
Abstract A flexible membrane material of good water repellency comprising a base material and a water repellent layer on the base material, wherein the water repellent layer is a thin rubber layer having therein finely divided fluorinated resin grains scattered and rubbed in. This water repellent layer is firmly adhered to the base material and is substantially free from development of cracks during use. Furthermore the water-repellent layer prevents permeation of water and formation of a water layer on the membrane material. The flexible membrane material of the invention is suitable for use in the production of a radome for a satellite communication system, pneumatic membrane structures, or tents.
Inventors
- 👤 Yoshitaka Osawa
- 👤 Akira Nishimura
- 👤 Junki Morimi
- 👤 Mitsunobu Tobe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:30
CPC Classifications
B; B32; B32B; B32B25/00; B32B25/04; B32B25/10; B32B2307/00; B32B2307/50; B32B2307/546; B32B2307/70; B32B2307/726; B32B2307/7265; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/269; Y10T428/27; Y10T428/273; Y10T442/00; Y10T442/20; Y10T442/2164; Y10T442/2189
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
52 words
A flexible membrane material comprising a flexible base material and a water repellent layer on the base material, wherein the water repellent layer is a rubber layer comprising a substantially uniform dispersion of finely-divided particles of a fluorinated resin in at least a portion thereof, the fluorinated resin being a fluorocarbon polymer.
Claim 2
Dependent Claim
52 words
A flexible membrane material comprising a flexible base material and a water repellent layer on the base material, wherein the water repellent layer is a rubber layer comprising a substantially uniform dispersion of finely-divided particles of a fluorinated resin in at least a portion thereof, the fluorinated resin being a fluorocarbon polymer.
Claim 3
Dependent Claim
15 words
The material as claimed in claim 1, wherein the base material is a rubber-coated fabric.
Claim 4
Dependent Claim
14 words
The material as claimed in claim 1, which is used for a radar dome.
Claim 5
Dependent Claim
27 words
The flexible membrane material as claimed in claim 1, wherein said dispersion of finely-divided fluorinated resin particles is provided adjacent to the surface of water repellent layer.
Claim 6
Dependent Claim
17 words
The flexible membrane material as claimed in claim 1, wherein said fluorinated resin is a perfluorinated resin.
Claim 7
Dependent Claim
35 words
The flexible membrane material as claimed in claim 1, wherein said fluorinated resin is selected from the group consisting of polychlorotrifluoroethylene, polyvinyl fluoride, tetrafluoroethylene-ethylene coolymers, trifluoromonochloroethylene-ethylene copolymers, polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymers, and tetrafluoroethylene-perfluroalkyl vinyl ether copolymers.
Claim 8
Dependent Claim
24 words
The flexible membrane material as claimed in claim 1, wherein said finely-divided particles have a mean average diameter of about 0.01 to about 100μ.
Claim 9
Dependent Claim
22 words
The flexible membrane material as claimed in claim 7, wherein said finely-divided particles have an average particle diameter of 5 to 50μ.
Claim 10
Dependent Claim
22 words
The flexible membrane material as claimed in claim 8, wherein said finely-divided particles have an average particle diameter of 10 to 30μ.
Claim 11
Dependent Claim
54 words
The flexible membrane material as claimed in claim 1, wherein said rubber layer comprises a rubber selected from the group consisting of natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, butyl rubber, chlorosulfonated polyethylene rubber, urethane rubber, acrylate rubber, polysulfated rubber, silicone rubber fluorinated rubber, epichlorohydrin rubber and ethylene-acrylate rubber.
Claim 12
Dependent Claim
33 words
The flexible membrane materials as claimed in claim 1, wherein said fluorinated resin particles are applied to said rubber layer in an amount of from about 0.01 to about 1,000 g/m 2 .
Claim 13
Dependent Claim
31 words
The flexible membrane material as claimed in claim 11, wherein said fluorinated resin particles are applied to said rubber layer in an amount of from 5 to 10 g/m 2 .
Claim 14
Dependent Claim
21 words
The flexible membrane material as claimed in claim 1, wherein the base material is a material to which rubber will adhere.
Claim 15
Dependent Claim
36 words
The flexible membrane material as claimed in claim 1, wherein the base material is selected from a fabric formed from organic or inorganic fibers, a rubber sheet, a plastic sheet, and a rubber or plastic-coated cloth.
References Cited (Backward Citations)
US4346139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |