US3735475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing vented lined pipe
Assignee: Dow Chemical Co
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Filing: 1971-10-08
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Granted: 1973-05-29
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Expires: 1991-10-08
Abstract
Abstract Lined pipe is conveniently and safely vented by providing a plurality of spaces disposed between the lining and the pipe and venting gases at the terminal portions of the pipe section either to another section or to a gas dispersal facility.
Inventors
- 👤 L Marriott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:24
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/07; F16L39/00; F16L58/00; F16L58/02; F16L58/04; F16L58/10; F16L58/1009; F16L58/1027; F16L9/00; F16L9/18; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49879; Y10T29/49908; Y10T29/49925; Y10T29/49927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
A method for fabricating lined conduit or pipe suited for the handling of materials of a corrosive nature under pressure, the method comprising supplying an elongate ductile metal casing having a first end and a second end and defining a longitudinal passage therein, providing a plurality of grooves extending from the first end to the second end of the casing on an inner wall of the casing, disposing within the casing a synthetic resinous organic chemically resistant liner subject to cold flow, the liner being generally coextensive with the passage within the casing, swaging the ductile metal casing about the liner whereby a plurality of passageways are defined by the liner and the casing, the passageways extending from the first end to the second end, the passages being of such a size that cold flow of the liner under service conditions does not close the passages.
Claim 2
Independent Claim
146 words
A method for fabricating lined conduit or pipe suited for the handling of materials of a corrosive nature under pressure, the method comprising supplying an elongate ductile metal casing having a first end and a second end and defining a longitudinal passage therein, providing a plurality of grooves extending from the first end to the second end of the casing on an inner wall of the casing, disposing within the casing a synthetic resinous organic chemically resistant liner subject to cold flow, the liner being generally coextensive with the passage within the casing, swaging the ductile metal casing about the liner whereby a plurality of passageways are defined by the liner and the casing, the passageways extending from the first end to the second end, the passages being of such a size that cold flow of the liner under service conditions does not close the passages.
References Cited (Backward Citations)
US2386747A
Cited
US3315348A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |