Patent US3520313A successfully refreshed from Google Patents.
US3520313A
Expired / Lapsed
US
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Process for facilitating pipeline flow of highly viscous liquids
Assignee: Shell USA Inc
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Filing: 1967-12-08
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Granted: 1970-07-14
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Expires: 1987-12-08
Abstract
No abstract record available.
Inventors
- 👤 Errol V Seymour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:35
CPC Classifications
F; F17; F17D; F17D1/00; F17D1/08; F17D1/16; F17D1/17; C; C09; C09K; C09K2208/00; C09K2208/28; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA625980A
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US2742426A
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US3006354A
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US2935129A
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US2981683A
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US3102548A
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US3254719A
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US3434485A
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US3425429A
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US3378074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |