Patent US3581671A successfully refreshed from Google Patents.
Patent US2993773A successfully refreshed from Google Patents.
US2993773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ester additives
Assignee: Baker Petrolite LLC
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Filing: 1959-02-02
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Granted: 1961-07-25
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Expires: 1979-02-02
Abstract
No abstract record available.
Inventors
- 👤 Verner L Stromberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:43
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/24; C10L1/19; C10L1/1905; C10L1/1915; C10L1/192; C10L1/198; C10L1/1983; C10L1/1985; C10L1/1986; C10L1/2406; C10L1/2462; C10L1/2475
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A PROCESS OF PREVENTING, INHIBITING AND MODIFYING THE FORMATION OF DEPOSITS IN INTERNAL COMBUSTION AND JET ENGINES EMPLOYING A SUBSTANTIALLY HYDROCARBON FUEL WHICH COMPRISES BURNING IN SUCH ENGINES A FUEL CONSISTING OF A LIQUID HYDROCARBON HAVING A BOILING POINT UP TO ABOUT 500*F. AND A MINOR AMOUNT, IN THE RANGE OF APPROXIMATELY 0.001 TO 2.0 WEIGHT PERCENT OF SAID FUEL SUFFICIENT TO PREVENT, INHIBIT AND MODIFY SUCH DEPOSITS, OF AN ESTER OF (1) A MEMBER SELECTED FROM THE GROUP CONSISTING OF AN ALKENYL SUCCINIC ACID AND THE ANHYDRIDE THEREOF, HAVING 3-31 CARBON ATOMS ON THE ALKENYL GROUP AND (2) AN ALCOHOL, SAID ESTER BEING SOLUBLE IN SAID LIQUID HYDROCARBON AND BEING COMPOSED OF ONLY CARBON, HYDROGEN AND OXYGEN.
Claim 2
Dependent Claim
118 words
A PROCESS OF PREVENTING, INHIBITING AND MODIFYING THE FORMATION OF DEPOSITS IN INTERNAL COMBUSTION AND JET ENGINES EMPLOYING A SUBSTANTIALLY HYDROCARBON FUEL WHICH COMPRISES BURNING IN SUCH ENGINES A FUEL CONSISTING OF A LIQUID HYDROCARBON HAVING A BOILING POINT UP TO ABOUT 500*F. AND A MINOR AMOUNT, IN THE RANGE OF APPROXIMATELY 0.001 TO 2.0 WEIGHT PERCENT OF SAID FUEL SUFFICIENT TO PREVENT, INHIBIT AND MODIFY SUCH DEPOSITS, OF AN ESTER OF (1) A MEMBER SELECTED FROM THE GROUP CONSISTING OF AN ALKENYL SUCCINIC ACID AND THE ANHYDRIDE THEREOF, HAVING 3-31 CARBON ATOMS ON THE ALKENYL GROUP AND (2) AN ALCOHOL, SAID ESTER BEING SOLUBLE IN SAID LIQUID HYDROCARBON AND BEING COMPOSED OF ONLY CARBON, HYDROGEN AND OXYGEN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |