Patent GB816632A successfully refreshed from Google Patents.
Patent US2516640A successfully refreshed from Google Patents.
US2516640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic fluids
Assignee: Gulf Research and Development Co
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Filing: 1947-11-06
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Granted: 1950-07-25
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Expires: 1967-11-06
Abstract
No abstract record available.
Inventors
- 👤 Charles W Montgomery
- 👤 William I Gilbert
- 👤 Robert E Kline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:55
CPC Classifications
C; C10; C10M; C10M3/00; C10M2203/00; C10M2203/10; C10M2203/102; C10M2203/104; C10M2203/106; C10M2203/108; C10M2207/00; C10M2207/04; C10M2207/046; C10M2207/28; C10M2207/284; C10M2207/285; C10M2207/287; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/104; C10N; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
85 words
A HOMOGENOUS HYDRAULIC FLUID COMPRISING (1) A SUBSTANTIALLY NEUTRAL ESTER OF A MONOHYDRIC ALCOHOL AND THE MIXTURE OF ACIDS OBTAINED BY THE OXIDATION WITH GASEOUS OXYGEN OF AN AQUEOUS ALKALINE SLURRY OF A FINELY DIVIDED CARBONACEOUS MATERIAL SELECTED FROM THE GROUP CONSISTING OF COAL AND COKE OBTAINED BY THE CARBONIZATION OF COAL AT TEMPERATURES BELOW 700*C., AND (2) A RELATIVELY NON-VOLATILE DILUENT THEREFOR BOILING AT LEAST IN THE KEROSENE RANGE AND BEING PRESENT IN AN AMOUNT OF FROM 5 TO 50 PER CENT BY WEIGHT.
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) | 1953-07-24 | 1954-01-23 | 1954-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-24 | 1958-01-23 | 1958-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-24 | 1962-01-23 | 1962-07-25 | $7700.00 | Window Closed / Lapsed |