US4520547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flanging of plastic lined conduit
Assignee: Dow Chemical Co
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Filing: 1983-02-15
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Granted: 1985-06-04
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Expires: 2003-02-15
Abstract
Abstract Plastic lined pipe with the lining adhered to the pipe is flanged such as by a hydraulic operation. Resultant flanged pipe does not require heat treatment.
Inventors
- 👤 Larry J. Laursen
- 👤 Elton D. Prueter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:15
CPC Classifications
B; B21; B21D; B21D22/00; B21D22/10; B21D22/105; B21D19/00; B21D19/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49906; Y10T29/49908; Y10T29/49938; Y10T29/4994
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
81 words
A method for the preparation of a flanged synthetic resinous thermoplastic lined conduit, the steps of the method comprising providing a malleable metallic conduit having a malleable synthetic resinous liner, the synthetic resinous liner being adhered to the metallic conduit at least adjacent the terminal portions of the metallic conduit, deforming a terminal portion of the synthetic resinous lined conduit to form a generally outwardly extending radial flange thereon while maintaining adhesion of the plastic liner to the so-formed flange portion.
Claim 2
Independent Claim
81 words
A method for the preparation of a flanged synthetic resinous thermoplastic lined conduit, the steps of the method comprising providing a malleable metallic conduit having a malleable synthetic resinous liner, the synthetic resinous liner being adhered to the metallic conduit at least adjacent the terminal portions of the metallic conduit, deforming a terminal portion of the synthetic resinous lined conduit to form a generally outwardly extending radial flange thereon while maintaining adhesion of the plastic liner to the so-formed flange portion.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the malleable metallic conduit is steel.
Claim 4
Dependent Claim
17 words
The method of claim 1 including the step of adhering a synthetic resinous liner to the conduit.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein a synthetic resinous liner is adhered to the metallic conduit with an epoxy resin adhesive.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |