Patent US3679582A successfully refreshed from Google Patents.
US3679582A
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Flow improvement of waxy hydrocarbon with the aid of polysaccharide derivatives
Assignee: Shell USA Inc
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Filing: 1969-10-08
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Granted: 1972-07-25
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Expires: 1989-10-08
Abstract
Abstract A METHOD OF TRANSPORTING WAXY LIQUID HYDROCARBONS THROUGH CONDUITS WITHOUT CAUSING WAXY DEPOSITION OR PLUGGING OF THE CONDUITS AND IMPROVING THE FLOW CHARACTERISTICS OF THE HYDROCARBON BY ADDITION TO SAID HYDROCARBONS A SMALL AMOUNT OF A POLYSACCHARIDE DERIVATIVE HAVING SATURATED ALIPHATIC HYDROCARBON CHAINS OF AT LEAST 15 CARBON ATOMS IN THE MOLECULE.
Inventors
- 👤 Adriaan H Wagenaar
- 👤 Pieter H Van Der Meij
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:54
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/192; C10L1/198; C08; C08B; C08B33/00; C08B33/02; C09; C09K; C09K8/00; C09K8/52; C09K8/524; Y; Y10; Y10S; Y10S507/00; Y10S507/927; Y10S507/929; Y10S507/931; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391
Claims Analysis
Total Claims: 0
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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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |