Patent JPS6412631A successfully refreshed from Google Patents.
Patent US3861423A successfully refreshed from Google Patents.
US3861423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collapsible fluid conduit
Assignee: Johns Manville Corp
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Filing: 1972-12-18
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Granted: 1975-01-21
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Expires: 1992-12-18
Abstract
Abstract This invention relates to the construction of fluid conduit, particularly flexible conduits for use as straight sections, elbows and transitions. Flexible rectangular sheets are reinforced by a plurality of spaced apart, parallel elongate stiffening members coplanar with the sheet means and bonded thereto. The stiffening members are adapted to take angular set upon the sheet being bent whereby opposite sides of the sheet means are adapted to be closed to define a flexible conduit. Insulation in blanket form may be disposed adjacent the sheet means.
Inventors
- 👤 Lee M Hedges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:27
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/14; F16L25/00; F16L25/0009; F16L59/00; F16L59/14; F16L59/153; F24; F24F; F24F13/00; F24F13/02; F24F13/0245
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
146 words
A flexible conduit which can be axially collapsed comprising: a. inner, intermediate, and outer flexible walls, said inner wall defining the enclosed passage of said conduit, said outer wall defining the external surface of said conduit, at least one of said walls being fluid impervious, b. a plurality of unitary wire stiffening loops which retain a permanent set upon being bent disposed intermediate said inner wall and said intermediate wall, said stiffening loops being adjacent and bonded at spaced-apart locations to at least one of said inner and intermediate walls, said stiffening loops lying in planes substantially perpendicular to the longitudinal axis of said conduit whereby radial collapse of the conduit is prevented, c. a layer of thermal insulation between said intermediate wall and said outer wall, and d. collars at the ends of the conduit for facilitating the connection of said conduit to adjacent conduits.
Claim 2
Dependent Claim
146 words
A flexible conduit which can be axially collapsed comprising: a. inner, intermediate, and outer flexible walls, said inner wall defining the enclosed passage of said conduit, said outer wall defining the external surface of said conduit, at least one of said walls being fluid impervious, b. a plurality of unitary wire stiffening loops which retain a permanent set upon being bent disposed intermediate said inner wall and said intermediate wall, said stiffening loops being adjacent and bonded at spaced-apart locations to at least one of said inner and intermediate walls, said stiffening loops lying in planes substantially perpendicular to the longitudinal axis of said conduit whereby radial collapse of the conduit is prevented, c. a layer of thermal insulation between said intermediate wall and said outer wall, and d. collars at the ends of the conduit for facilitating the connection of said conduit to adjacent conduits.
Claim 3
Dependent Claim
14 words
The conduit as defined in claim 1 wherein the collars include flat metal strips.
Claim 4
Dependent Claim
15 words
The conduit as defined in claim 1 wherein the wire stiffening elements are metal wires.
Claim 5
Dependent Claim
16 words
The conduit as defined in claim 1 wherein the thermal insulation is a glass fiber mat.
References Cited (Backward Citations)
US789315A
Cited
US1991509A
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US2097663A
Cited
US2321064A
Cited
US3109670A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |