US3828823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lined conduit joints
Assignee: Dow Chemical Co
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Filing: 1972-11-20
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Granted: 1974-08-13
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Expires: 1992-11-20
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
2026-11-01 13:33
CPC Classifications
B; B29; B29C; B29C63/00; B29C63/26; B29C63/34; B29C63/346; B21; B21D; B21D39/00; B21D39/04; B29C57/00; F; F16; F16L; F16L23/00; F16L23/02; F16L23/024; F16L23/028; F16L23/0283; F16L58/00; F16L58/18; F16L58/187
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
A conduit having an end, the conduit having a ductile metal outer casing and a thermoplastic synthetic resinous liner disposed therein and generally coextensive with the metallic conduit adjacent the end, the conduit and liner being affixed to each other by means of an annular ductile metal ring disposed over the end of the conduit and engaging both liner and conduit, the conduit end defining a generally radially outwardly extending flange portion consisting of the conduit, liner and ring.
Claim 2
Dependent Claim
79 words
A conduit having an end, the conduit having a ductile metal outer casing and a thermoplastic synthetic resinous liner disposed therein and generally coextensive with the metallic conduit adjacent the end, the conduit and liner being affixed to each other by means of an annular ductile metal ring disposed over the end of the conduit and engaging both liner and conduit, the conduit end defining a generally radially outwardly extending flange portion consisting of the conduit, liner and ring.
Claim 3
Dependent Claim
22 words
The conduit of claim 1 wherein the flange portion defines a generally frustoconical portion encircling at least a portion of the conduit.
Claim 4
Dependent Claim
76 words
A conduit having an end, the conduit having a ductile metal outer casing and a thermoplastic synthetic resinous liner disposed therein and generally coextensive with the metallic conduit adjacent the end, the conduit and liner being affixed to each other, the conduit end defining a generally radially outwardly extending flange portion consisting of the conduit and liner, a ductile metal sleeve disposed within the end of the conduit and conforming to the configuration of the flange.
Claim 5
Dependent Claim
76 words
A conduit having an end, the conduit having a ductile metal outer casing and a thermoplastic synthetic resinous liner disposed therein and generally coextensive with the metallic conduit adjacent the end, the conduit and liner being affixed to each other, the conduit end defining a generally radially outwardly extending flange portion consisting of the conduit and liner, a ductile metal sleeve disposed within the end of the conduit and conforming to the configuration of the flange.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |