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Patent US3334048A successfully refreshed from Google Patents.
US3334048A
Expired / Lapsed
US
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Hydraulic fluids
Assignee: Castrol Ltd
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Filing: 1964-01-13
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Granted: 1967-08-01
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Expires: 1984-01-13
Abstract
No abstract record available.
Inventors
- 👤 Hitchcock Norman Ern Frederick
- 👤 Ker Robert Alan Cameron
- 👤 Carswell Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:13
CPC Classifications
C; C10; C10M; C10M3/00; C10M2207/00; C10M2207/02; C10M2207/021; C10M2207/022; C10M2207/10; C10M2207/12; C10M2207/121; C10M2207/123; C10M2207/129; C10M2207/22; C10M2207/28; C10M2207/282; C10M2207/287; C10M2207/34; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/105; C10M2209/106; C10M2209/107; C10M2209/108; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/22; C10M2215/221; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/26; C10M2215/30; C10N; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
50 words
A HYDRAULIC FLUID CONSISTING ESSENTIALLY OF A BASE FLUID SELECTED FROM THE GROUP CONSISTING OF POLYOXYALKYLENE GLYCOLS OR ETHERS THEREOF HAVING DISSOLVED THEREIN FROM 0.5 TO 2.0 PERCENT BY WEIGHT ON THE WEIGHT OF THE BASE FLUID OF A POLYESTER PREPARED FROM AN ALIPHATIC DICARBOXYLIC ACID HAVING A 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) | 1970-07-31 | 1971-01-30 | 1971-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-31 | 1975-01-30 | 1975-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-31 | 1979-01-30 | 1979-08-01 | $7700.00 | Window Closed / Lapsed |