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US3650550A
Expired / Lapsed
US
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Lined conduit
Assignee: Dow Chemical Co
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Filing: 1970-08-13
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Granted: 1972-03-21
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Expires: 1990-08-13
Abstract
Abstract In lined conduit having flanged connections, improved joints are obtained when a multiple recessed rigid support is employed underneath the molded raised face of the flange of the plastic liner. Substantially improved joints are obtained under conditions wherein the plastic lining is subject to cold flow.
Inventors
- 👤 Walter H West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:48
CPC Classifications
F; F16; F16L; F16L23/00; F16L23/12; F16L23/125; B; B29; B29C; B29C63/00; B29C63/26; B29C63/34; B29C63/346; F16L58/00; F16L58/18; F16L58/187
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
105 words
A conduit, the conduit comprising a rigid outer casing having a first end, the first end having a flange thereon adapted to connect with a mating flange, the conduit having an inner synthetic polymeric lining, the lining being subject to cold flow, the lining having a flange adjacent the first end of the conduit, the lining flange extending generally parallel to the conduit flange and supported by said conduit flange, the improvement which comprises a multiple recessed rigid support disposed generally within the liner flange, the support defining a plurality of recesses, the recesses containing material of the liner flange and being in contact therewith.
Claim 2
Dependent Claim
105 words
A conduit, the conduit comprising a rigid outer casing having a first end, the first end having a flange thereon adapted to connect with a mating flange, the conduit having an inner synthetic polymeric lining, the lining being subject to cold flow, the lining having a flange adjacent the first end of the conduit, the lining flange extending generally parallel to the conduit flange and supported by said conduit flange, the improvement which comprises a multiple recessed rigid support disposed generally within the liner flange, the support defining a plurality of recesses, the recesses containing material of the liner flange and being in contact therewith.
Claim 3
Dependent Claim
16 words
The conduit of claim 1 wherein the multiple recessed rigid support is a perforate metallic element.
Claim 4
Dependent Claim
24 words
The conduit of claim 1 wherein the support has a generally annular configuration and means defining a shoulder adapted to engage the outer casing.
Claim 5
Dependent Claim
17 words
The conduit of claim 1 wherein the rigid support defines a generally axially and inwardly disposed flange.
Claim 6
Dependent Claim
14 words
A conduit in accordance with claim 1 in sealing engagement with a like conduit.
Claim 7
Dependent Claim
14 words
The conduit of claim 5 including means to axially tension the conduit section together.
Claim 8
Dependent Claim
14 words
The conduit of claim 1 wherein the support has a generally annular frustoconical configuration.
References Cited (Backward Citations)
CA678241A
Cited
US1939872A
Cited
US3039795A
Cited
FR1268406A
Cited
US3139115A
Cited
US3383750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |