Patent US4488739A successfully refreshed from Google Patents.
US4488739A
Expired / Lapsed
US
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Insulating pipe part
Assignee: Wavin BV
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Filing: 1982-02-12
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Granted: 1984-12-18
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Expires: 2002-02-12
Abstract
Abstract An insulating pipe part of thermoplastic material comprises two opposite sections and one third section disposed at an angle with respect to the former sections, the wall portion of said sections being provided with a continuous wall cutting slit. The pipe part may comprise thicker parts of a polyurethan foam. For forming an insulated branch pipe joint, said insulating pipe part is pushed over a branch pipe and subsequently plastic sleeves with beveled front ends are heatshrunk on to said sections, thereby closing said slit in a moisture tight manner. In order to obtain a reliable moisture tight closing, the sleeves are provided with beveled front ends so that the lower sleeve ends overlap each other.
Inventors
- 👤 Tinus de Lange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:57
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/14; F16L59/16; F16L59/163
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
An insulated branch pipe joint comprising a central branch pipe part having two lateral branch pipe part stubs disposed opposite each other and a complemental third branch pipe part section being connected therewith and providing an insulating casing, said insulating casing being composed of an insulating pipe part having a continuous wall part having a slit provided in the bottom wall portion opposite said central branch pipe part, said third insulating branch pipe part section having a central closed wall and being integral with the walls of the two opposed insulating pipe part sections, each of the two opposed insulating pipe part sections being provided with sleeves of thermoplastic material preferably polyolefins heat shrunk clampingly engaging the two branch pipe part stubs, each said sleeve being provided with a beveled front end in a manner so that each overlaps the opposite sleeve in the wall portion of the insulating pipe part having the slit thereby closing the slit moisture tight.
Claim 2
Dependent Claim
160 words
An insulated branch pipe joint comprising a central branch pipe part having two lateral branch pipe part stubs disposed opposite each other and a complemental third branch pipe part section being connected therewith and providing an insulating casing, said insulating casing being composed of an insulating pipe part having a continuous wall part having a slit provided in the bottom wall portion opposite said central branch pipe part, said third insulating branch pipe part section having a central closed wall and being integral with the walls of the two opposed insulating pipe part sections, each of the two opposed insulating pipe part sections being provided with sleeves of thermoplastic material preferably polyolefins heat shrunk clampingly engaging the two branch pipe part stubs, each said sleeve being provided with a beveled front end in a manner so that each overlaps the opposite sleeve in the wall portion of the insulating pipe part having the slit thereby closing the slit moisture tight.
References Cited (Backward Citations)
US3191632A
Cited
US3192377A
Cited
US3453716A
Cited
US3575214A
Cited
US3744823A
Cited
US4259981A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |