US3777502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of transporting liquid and gas
Assignee: Newport News Shipbuilding and Dry Dock Co
•
Filing: 1971-03-12
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Granted: 1973-12-11
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Expires: 1991-03-12
Abstract
Abstract Method of simultaneously transporting liquid and gas within a pipeline, such that the gas serves as an insulator for the liquid and as a sealant for the liquid in case of pipeline failure. A liquid passage is supported substantially axially with respect to an outer gas passage, such that the gas flows annularly of the flowing liquid.
Inventors
- 👤 J Michie
- 👤 R Calvert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:05
CPC Classifications
F; F17; F17D; F17D1/00; F16; F16L; F16L9/00; F16L9/18; Y; Y10; Y10S; Y10S166/00; Y10S166/901; Y10T; Y10T137/00; Y10T137/6416; Y10T137/6579
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
Method of transporting hot crude oil liquid and natural gas over permafrost, comprising: A supporting an inner crude oil liquid pipeline substantially concentrically within an outer natural gas pipeline, such that there is defined an inner crude oil liquid passage and a surrounding annular gas passage; B flowing crude oil liquid through said inner liquid passage; C injecting natural gas into said annular passage; D flowing said gas simultaneously with flowing of said liquid; and E freely supporting the lower exterior surface of said liquid passage upon engaging the lower inner surface of said annular gas passage, so as to permit longitudinal and transverse flexing of said inner liquid passage with respect to said surrounding annular passage.
Claim 2
Dependent Claim
117 words
Method of transporting hot crude oil liquid and natural gas over permafrost, comprising: A supporting an inner crude oil liquid pipeline substantially concentrically within an outer natural gas pipeline, such that there is defined an inner crude oil liquid passage and a surrounding annular gas passage; B flowing crude oil liquid through said inner liquid passage; C injecting natural gas into said annular passage; D flowing said gas simultaneously with flowing of said liquid; and E freely supporting the lower exterior surface of said liquid passage upon engaging the lower inner surface of said annular gas passage, so as to permit longitudinal and transverse flexing of said inner liquid passage with respect to said surrounding annular passage.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |