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US3581776A
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US
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Pipe insulation structure
Assignee: Dow Chemical Co
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Filing: 1968-10-02
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Granted: 1971-06-01
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Expires: 1988-10-02
Abstract
Abstract A flexible insulation structure for pipes, tubing and the like having a constant outer diameter and inwardly directed projections from its inner surface which permit the positioning of pipes of varying diameter within the structure.
Inventors
- 👤 James P Sheahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:45
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/02; F16L59/021; F16L59/022
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
An insulative structure particularly suited for use on pipe of at least twO different sizes, the structure comprising flexible polymer foam, said structure being a hollow tube, the tube having an inner wall, the inner wall having a plurality of flexible projections inwardly projecting toward the center whereby pipes having varying outer diameters may be positioned concentrically within said insulation, said outer diameters being less than the diameter of said inner wall and large enough to contact said projections, wherein said projections are individual sets of fingers, the fingers in each set of substantially the same length, equally spaced, and in the same axial plane, each set of fingers being equal in length to at least one other set of fingers.
Claim 2
Dependent Claim
121 words
An insulative structure particularly suited for use on pipe of at least twO different sizes, the structure comprising flexible polymer foam, said structure being a hollow tube, the tube having an inner wall, the inner wall having a plurality of flexible projections inwardly projecting toward the center whereby pipes having varying outer diameters may be positioned concentrically within said insulation, said outer diameters being less than the diameter of said inner wall and large enough to contact said projections, wherein said projections are individual sets of fingers, the fingers in each set of substantially the same length, equally spaced, and in the same axial plane, each set of fingers being equal in length to at least one other set of fingers.
Claim 3
Dependent Claim
9 words
The structure of claim 1 made of foamed polyethylene.
Claim 4
Dependent Claim
44 words
The structure of claim 1 wherein the depth of the projections from said inner wall to a pipe of smallest diameter capable of being positioned thereby is no greater than the depth of the material that is equal to the thermal conductance of air.
References Cited (Backward Citations)
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Cited
US2782251A
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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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |