US2991252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic lubricants
Assignee: BP PLC
•
Filing: 1958-08-14
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Granted: 1961-07-04
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Expires: 1978-08-14
Abstract
No abstract record available.
Inventors
- 👤 Pethrick Samuel Richard
- 👤 Sparke Maurice Barrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:36
CPC Classifications
C; C10; C10M; C10M3/00; C10M2207/00; C10M2207/28; C10M2207/282; C10M2207/30; C10M2207/304; C10M2207/34; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/10; C10M2209/102; C10M2209/103; C10M2209/104; C10M2209/107; C10M2209/109; C10M2209/11; C10M2209/112; C10M2219/00; C10M2219/10; C10M2219/104; C10M2219/108; C10N; C10N2030/00; C10N2030/08; C10N2040/00; C10N2040/12; C10N2040/13
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
6 words
A LUBRICATING COMPOSITION CONSISTING ESSENTIALLY OF
Claim 2
Dependent Claim
6 words
A LUBRICATING COMPOSITION CONSISTING ESSENTIALLY OF
Claim 3
Dependent Claim
101 words
IN A PROCESS FOR THE PRODUCTION OF SODIUM AND POTASSIUM SALTS OF HYPOSULPHUROUS ACID BY THE REDUCTION A BLEND OF: A LIQUID ALIPHATIC DIESTER OF THE FORMULA R4OOCR5COOR4 OF THE SO2-ION IN AQUEOUS SOLUTION, THE STEP WHICH COMPRISES REDUCING THE SO2-ION BY MEANS OF A BOROHYDRIDE WHERE R5 IS AN ALKYLENE GROUP HAVING 4-14 CARBON ATOMS AND R4 IS AN ALKYL GROUP HAVING 4-18 CARBON WHICH IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF SODIUM AND POTASSIUM BOROHYDRIDE. ATOMS, AND 5-60% BY WEIGHT OF THE COMPOSITION OF A POLYESTER WHICH IS SOLUBLE IN THE DIESTER AND HAS THE GENERAL FORMULA
Claim 4
Dependent Claim
101 words
IN A PROCESS FOR THE PRODUCTION OF SODIUM AND POTASSIUM SALTS OF HYPOSULPHUROUS ACID BY THE REDUCTION A BLEND OF: A LIQUID ALIPHATIC DIESTER OF THE FORMULA R4OOCR5COOR4 OF THE SO2-ION IN AQUEOUS SOLUTION, THE STEP WHICH COMPRISES REDUCING THE SO2-ION BY MEANS OF A BOROHYDRIDE WHERE R5 IS AN ALKYLENE GROUP HAVING 4-14 CARBON ATOMS AND R4 IS AN ALKYL GROUP HAVING 4-18 CARBON WHICH IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF SODIUM AND POTASSIUM BOROHYDRIDE. ATOMS, AND 5-60% BY WEIGHT OF THE COMPOSITION OF A POLYESTER WHICH IS SOLUBLE IN THE DIESTER AND HAS THE GENERAL FORMULA
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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |