Patent US4280534A successfully refreshed from Google Patents.
US4280534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastics pipes having walls with lengthwise extending channels
Assignee: Wavin BV
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Filing: 1978-05-09
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Granted: 1981-07-28
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Expires: 1998-05-09
Abstract
Abstract Plastics pipes comprising an inner and outer wall being interconnected by lengthwise extending connecting partitions, forming channels, the ends of the channels being each separately sealed by sealingly pressing the end walls of a channel to each other after these walls have been heated to a temperature surpassing the plasticizing temperature.
Inventors
- 👤 Jan P. van Dongeren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:38
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/14; B29C57/00; B29C57/02; B29C65/00; B29C65/02; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/12; B29C66/122; B29C66/1222; B29C66/1224; B29C66/1226; B29C66/50; B29C66/51; B29C66/53; B29C66/534; B29C66/5344; F; F16; F16L; F16L9/00; F16L9/12; F16L9/127; F16L9/18; B29L; B29L2024/00; B29L2024/006; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1005
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
115 words
A plastic pipe comprising: an inner wall and an outer wall, said walls being interconnected by connecting partitions forming substantially rounded channels extending substantially entirely lengthwise of said pipe, at least one end of said pipe having a conical channel closing wall formed by a diverging straight-line conical portion of said inner wall directed toward and integrally formed with the outer wall adjacent said pipe end and generally cylindrical socket means, being integrally formed with said walls and extending for a distance beyond said pipe end, for receiving internally therein a mating end of another pipe, said inner and outer walls, and said partitions all being integrally formed together in one piece from plastic material.
Claim 2
Dependent Claim
115 words
A plastic pipe comprising: an inner wall and an outer wall, said walls being interconnected by connecting partitions forming substantially rounded channels extending substantially entirely lengthwise of said pipe, at least one end of said pipe having a conical channel closing wall formed by a diverging straight-line conical portion of said inner wall directed toward and integrally formed with the outer wall adjacent said pipe end and generally cylindrical socket means, being integrally formed with said walls and extending for a distance beyond said pipe end, for receiving internally therein a mating end of another pipe, said inner and outer walls, and said partitions all being integrally formed together in one piece from plastic material.
Claim 3
Dependent Claim
21 words
The plastic pipe according to claim 1, wherein said socket means includes an interior annular groove for receiving a sealing member.
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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) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |