US3974989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inflatable lighter-than-air article composed of a coated triaxial weave construction
Assignee: EIDP Inc
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Filing: 1975-04-10
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Granted: 1976-08-17
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Expires: 1995-04-10
Abstract
Abstract An improved lighter-than-air article is provided. The improvement is a covering which consists essentially of a triaxial fabric having a gas impermeable polymeric film firmly adhered to one surface and a heat-sealable polymeric film firmly adhered to the other surface.
Inventors
- 👤 Kenneth A. Goodfellow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:27
CPC Classifications
B; B64; B64B; B64B1/00; B64B1/06; B64B1/14; Y; Y10; Y10T; Y10T442/00; Y10T442/30; Y10T442/3179; Y10T442/3187
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
156 words
In an improved lighter-than-air article comprised of lighter-than-air gas and a covering to contain the gas, the improvement consisting of a covering which is a coated triaxial weave fabric consisting essentially of a. a triaxial weave fabric consisting of fibers wherein said fibers are polyester, polyamide, or aromatic aramide, and weighing less than 2 ounces per square yard; b. a heat-sealable polymeric film firmly adhered to one side of the triaxial weave fabric, said heat-sealable polymeric film being polyether urethane, polyester urethane, polyvinyl chloride, or chlorosulfonated polyethylene; and c. a gas-impermeable film firmly adhered to the other side of the triaxial weave fabric, said gas-impermeable film being polyvinyl fluoride, polyethylene terephthalate, or polyvinylidene chloride; and the coated triaxial weave fabric having a thickness of 6 to 10 mils, a tensile strength measured at the weakest direction according to ASTM-D-751 of at least 300 pounds, and a tear strength measured by ASTM-D-751 of at least 25 pounds.
Claim 2
Dependent Claim
156 words
In an improved lighter-than-air article comprised of lighter-than-air gas and a covering to contain the gas, the improvement consisting of a covering which is a coated triaxial weave fabric consisting essentially of a. a triaxial weave fabric consisting of fibers wherein said fibers are polyester, polyamide, or aromatic aramide, and weighing less than 2 ounces per square yard; b. a heat-sealable polymeric film firmly adhered to one side of the triaxial weave fabric, said heat-sealable polymeric film being polyether urethane, polyester urethane, polyvinyl chloride, or chlorosulfonated polyethylene; and c. a gas-impermeable film firmly adhered to the other side of the triaxial weave fabric, said gas-impermeable film being polyvinyl fluoride, polyethylene terephthalate, or polyvinylidene chloride; and the coated triaxial weave fabric having a thickness of 6 to 10 mils, a tensile strength measured at the weakest direction according to ASTM-D-751 of at least 300 pounds, and a tear strength measured by ASTM-D-751 of at least 25 pounds.
Claim 3
Dependent Claim
15 words
The improved article of claim 1 wherein triaxial weave fabric consists of aromatic aramide fibers.
Claim 4
Dependent Claim
32 words
The improved article of claim 1 wherein the gas impermeable film has a thickness of 0.001-0.0015 mil, weight of 1.3-2.0 ounces per square yard, and is further comprised of an ultraviolet absorber.
Claim 5
Dependent Claim
19 words
The improved article of claim 3 wherein the gas impermeable film is pretreated with compounds to increase its adhesiveness.
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) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |