US4541655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe coupling joint
Assignee: Individual
•
Filing: 1983-02-07
•
Granted: 1985-09-17
•
Expires: 2003-02-07
Abstract
Abstract Disclosed is a pipe coupling joint comprising an interference fit coupling of unthreaded pipe sections. The end of the outer pipe in a telescoped interference fit coupling is radially compressed to form a groove in the inner pipe. The crimped end is compressed into the groove to securely couple the pipe sections together. Lined pipe joints and methods and apparatus for forming the improved interference fit joint are also disclosed.
Inventors
- 👤 John J. Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:58
CPC Classifications
F; F16; F16L; F16L13/00; F16L13/14; F16L13/16; F16L13/161; B; B21; B21D; B21D39/00; B21D39/04; B23; B23P; B23P19/00; B23P19/02; F16L13/163; Y; Y10; Y10S; Y10S285/00; Y10S285/915
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
131 words
An interference fit joint coupling a first rigid malleable metal pipe section and a second rigid malleable metal pipe section, the end of said first pipe section telescopically inserted within the end of said second pipe section and a portion of said second pipe section surrounding said first pipe section deformed into a recess formed in the outer surface of said first pipe section by the inward deformation of said portion of said second pipe section and including a continuous plastic liner bonded to the internal surfaces of said first and second pipe sections wherein the liner bonded to the internal surface of said first pipe section extends from the end of said first pipe section and is bonded to the internal surface of said liner in said second pipe section.
Claim 2
Dependent Claim
131 words
An interference fit joint coupling a first rigid malleable metal pipe section and a second rigid malleable metal pipe section, the end of said first pipe section telescopically inserted within the end of said second pipe section and a portion of said second pipe section surrounding said first pipe section deformed into a recess formed in the outer surface of said first pipe section by the inward deformation of said portion of said second pipe section and including a continuous plastic liner bonded to the internal surfaces of said first and second pipe sections wherein the liner bonded to the internal surface of said first pipe section extends from the end of said first pipe section and is bonded to the internal surface of said liner in said second pipe section.
Claim 3
Dependent Claim
29 words
The joint defined in claim 1 wherein the interference between the mating ends of said first and second pipe sections is from about 0.030 inch to about 0.060 inch.
Claim 4
Dependent Claim
28 words
The joint defined in claim 1 including a bonding agent bonding the internal surface of said second pipe section to the external surface of said first pipe section.
Claim 5
Dependent Claim
35 words
The joint defined in claim 1 wherein the mouth of said second pipe section surrounding said first pipe section is radially depressed into an annular groove in the outer surface of said first pipe section.
Claim 6
Dependent Claim
33 words
The joint defined in claim 1 including a bonding agent forming a plastic-to-plastic bond between the overlapped ends of said liners and a metal-to-metal bond between the overlapped ends of said pipe sections.
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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) | 1988-09-16 | 1989-03-18 | 1989-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-16 | 1993-03-18 | 1993-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-16 | 1997-03-18 | 1997-09-17 | $7700.00 | Window Closed / Lapsed |