US3793131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible insulated conduit and method of making the same
Assignee: Johns Manville Corp
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Filing: 1971-12-01
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Granted: 1974-02-19
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Expires: 1991-12-01
Abstract
Abstract The disclosure relates to a flexible, insulated conduit and the frame stock for the conduit. The frame stock comprises a pair of flexible facing sheets with a layer insulating material and a plurality of spaced-apart elongate stiffening elements disposed therebetween and bonded thereto. The frame stock is made by passing two continuous sheets of adhesively coated facing material, a continuous blanket of insulating material and a plurality of wires between pressure rolls with the blanket of insulating material and wires being disposed intermediate the facing sheets. The conduit is made by folding a sheet of frame stock into an enclosed passage and forming a flexible joint to unite the edges of the thus folded sheet.
Inventors
- 👤 L Hedges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:18
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/0218; F16; F16L; F16L59/00; F16L59/02; F16L59/14; F16L59/153; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1028; Y10T156/103; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/1352; Y10T428/1362; Y10T428/24; Y10T428/24479; Y10T428/24488; Y10T428/24777; Y10T428/24793; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/249942; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
142 words
Frame stock for folding and forming into conduit comprising: a first and second flexible facing sheets, b a plurality of elongate stiffening elements disposed intermediate said facing sheets, said stiffening elements being adjacent said first facing sheet and said stiffening elements being substantially parallel with respect to each other and secured to said first facing sheet at spaced-apart locations along said facing sheet whereby the frame stock can be collapsed in a direction transverse to the longitudinal extent to the stiffening elements, and said stiffening elements being bendable and adapted to retain their shape once said elements have been bent, c a layer of thermal insulating material disposed intermediate said facing sheets, d a pair of collar strips comprising edge portions of said facing sheets which extend parallel with respect to the elongate stiffening elements, and e means joining said facing sheets.
Claim 2
Dependent Claim
142 words
Frame stock for folding and forming into conduit comprising: a first and second flexible facing sheets, b a plurality of elongate stiffening elements disposed intermediate said facing sheets, said stiffening elements being adjacent said first facing sheet and said stiffening elements being substantially parallel with respect to each other and secured to said first facing sheet at spaced-apart locations along said facing sheet whereby the frame stock can be collapsed in a direction transverse to the longitudinal extent to the stiffening elements, and said stiffening elements being bendable and adapted to retain their shape once said elements have been bent, c a layer of thermal insulating material disposed intermediate said facing sheets, d a pair of collar strips comprising edge portions of said facing sheets which extend parallel with respect to the elongate stiffening elements, and e means joining said facing sheets.
Claim 3
Dependent Claim
29 words
The frame stock of claim 1 wherein said stiffEning elements are adhesively secured to said first facing sheet and said insulating layer is adhesively secured to said facing sheets.
Claim 4
Dependent Claim
20 words
The frame stock of claim 1 wherein said collar strips extend beyond the outermost stiffening elements and said insulating layer.
Claim 5
Dependent Claim
22 words
The frame stock of claim 3 wherein said collar strips are said lateral edge portions of said facing sheets adhesively secured together.
Claim 6
Dependent Claim
18 words
The frame stock of claim 3 wherein one of said collar strips has a reinforcing strip secured thereto.
Claim 7
Dependent Claim
25 words
The frame stock of claim 3 wherein one of said collar strips has a reinforcing strip disposed intermediate and adhesively bonded to said facing sheets.
Claim 8
Dependent Claim
17 words
The frame stock of claim 3 wherein reinforcing strips are secured to both of said collar strips.
Claim 9
Dependent Claim
22 words
The frame stock of claim 3 wherein said collar strips have reinforcing strips disposed intermediate and adhesively bonded to said facing sheets.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |