US3742590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making improved lined conduit joints
Assignee: Dow Chemical Co
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Filing: 1970-09-25
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Granted: 1973-07-03
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Expires: 1990-09-25
Abstract
Abstract Joints are prepared in ductile metal conduits having thermoplastic lining by affixing the lining to the terminal portion of the conduit and deforming the conduit and lining simultaneously to form an outwardly extending flange adapted to mate with a like flange wherein the lining material may contact a like lining material of similar conduit end.
Inventors
- 👤 B Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:14
CPC Classifications
B; B21; B21D; B21D39/00; B21D39/04; B29; B29C; B29C57/00; B29C63/00; B29C63/26; B29C63/34; B29C63/346; F; F16; F16L; F16L23/00; F16L23/02; F16L23/024; F16L23/028; F16L23/0283; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49938; Y10T29/4994
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
63 words
A method for forming ends of thermoplastic lined metallic conduit, the steps of the method comprising providing a ductile metal conduit having a thermoplastic resinous liner, the conduit having an end, affixing the lining to the conduit adjacent to the end by means of a ductile metal retainer, and simultaneously deforming the conduit and liner to form a generally radially outwardly extending flange.
Claim 2
Independent Claim
63 words
A method for forming ends of thermoplastic lined metallic conduit, the steps of the method comprising providing a ductile metal conduit having a thermoplastic resinous liner, the conduit having an end, affixing the lining to the conduit adjacent to the end by means of a ductile metal retainer, and simultaneously deforming the conduit and liner to form a generally radially outwardly extending flange.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein at least a portion of the flange has a frustoconical configuration and encircles a portion of the conduit.
Claim 4
Dependent Claim
28 words
The method of claim 1 including the step of disposing a ductile metal sleeve within the end of the conduit and simultaneously deforming the sleeve, conduit and liner.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein the conduit end is deformed by means of a generally frustoconical tool.
References Cited (Backward Citations)
US1875885A
Cited
US2065480A
Cited
US2919936A
Cited
FR1383155A
Cited
US3239931A
Cited
US3399908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |