Patent US4409271A successfully refreshed from Google Patents.
US4409271A
Expired / Lapsed
US
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Lightweight construction element
Assignee: PEHR HOLDING GmbH
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Filing: 1981-12-16
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Granted: 1983-10-11
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Expires: 2001-12-16
Abstract
Abstract A lightweight construction element is provided with a fabric backing from untrimmed velvet fabric, coated to render it airtight and pressure resistant, with the internal space thereof allowing pressurization. With the pressurizing medium filled in, the yarn linking the two outer fabric webs will maintain a predetermined distance between the fabric webs and ensure high stability of the element.
Inventors
- 👤 Harald Pehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:27
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/30; E04C2/40; D; D03; D03D; D03D1/00; D03D1/02; E04C2/02; E04C2/26; E04C2/284; E04C2/296; E04C2/34; D03D11/00; D03D11/02; D10; D10B; D10B2401/00; D10B2401/08; D10B2403/00; D10B2403/02; D10B2403/021; E04H; E04H15/00; E04H15/20; E04H2015/202; E04H2015/205; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/231; Y10T428/233; Y10T428/239; Y10T428/23907; Y10T428/23914; Y10T428/249921; Y10T428/249953; Y10T428/249987
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
82 words
A lightweight construction element comprising: an untrimmed velvet fabric comprising; a first fabric web; and a second fabric web separated from said first fabric web and peripherally secured thereto; a plurality of pile yarns linking said first fabric web to said second fabric web at a predetermined distance; and an airtight pressure resistant coating provided on said first fabric web and on said second fabric web such that an airtight internal chamber is formed having said plurality of pile yarns disposed therein.
Claim 2
Dependent Claim
82 words
A lightweight construction element comprising: an untrimmed velvet fabric comprising; a first fabric web; and a second fabric web separated from said first fabric web and peripherally secured thereto; a plurality of pile yarns linking said first fabric web to said second fabric web at a predetermined distance; and an airtight pressure resistant coating provided on said first fabric web and on said second fabric web such that an airtight internal chamber is formed having said plurality of pile yarns disposed therein.
Claim 3
Dependent Claim
25 words
A lightweight construction element as in claim 1 further comprising a plastic foam disposed in said internal chamber so as to pressurize said internal chamber.
Claim 4
Dependent Claim
31 words
A lightweight construction element as in claim 1 further comprising at least one feed pipe passing through said pressure resistant coating and into said internal chamber for pressurizing said internal chamber.
Claim 5
Dependent Claim
31 words
A lightweight construction element as in claim 2 further comprising at least one feed pipe passing through said pressure resistant coating and into said internal chamber for pressurizing said internal chamber.
Claim 6
Dependent Claim
31 words
A lightweight construction element as in claim 1 wherein said plurality of pile yarns are disposed within a range of 30 to 200 of said pile yarns per cm 2 .
Claim 7
Dependent Claim
24 words
A lightweight construction element as claimed in claim 1 wherein said predetermined distance is maintained within a range of 2 mm to 20 mm.
Claim 8
Dependent Claim
29 words
A lightweight construction according to claim 1 wherein said pressure resistant coating comprises a rubber material applied to said first fabric web and said second fabric web by vulcanizing.
Claim 9
Dependent Claim
22 words
A lightweight construction element as in claim 1 further comprising a fluid disposed in said internal chamber for pressurizing said internal chamber.
References Cited (Backward Citations)
US3329750A
Cited
US3705645A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |