US2602780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic fluid
Assignee: Individual
•
Filing: 1945-08-17
•
Granted: 1952-07-08
•
Expires: 1965-08-17
Abstract
No abstract record available.
Inventors
- 👤 William A Zisman
- 👤 John K Wolfe
- 👤 Hayward R Baker
- 👤 Dwight R Spessard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:19
CPC Classifications
C; C10; C10M; C10M173/00; C10M173/02; C10M2201/00; C10M2201/02; C10M2201/06; C10M2201/062; C10M2201/085; C10M2201/087; C10M2207/00; C10M2207/02; C10M2207/021; C10M2207/022; C10M2207/04; C10M2207/046; C10M2209/00; C10M2209/02; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/107; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/044; C10M2215/06; C10M2215/064; C10M2215/22; C10M2215/221; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/26; C10M2215/30; C10M2219/00; C10M2219/10; C10M2219/102; C10M2219/104; C10M2219/106; C10N; C10N2010/00; C10N2010/02; C10N2040/00; C10N2040/08; C10N2050/00; C10N2050/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
AN HYDRAULIC FLUID CONSISTING ESSENTIALLY OF WATER AND A WATER MISCIBLE COMPOUND SELECTED FROM THE GROUP CONSISTING OF GLYCOLS AND GLYCOL ETHERS HAVING FROM 2 TO 14 CARBON ATOMS IN PROPORTIONS RESULTING IN A NON-INFLAMMABLE MIXTURE OF A SUBSTANTIALLY MINIMUM FREEZING POINT AND, AS A SOLUBLE THICKENER, FROM ABOUT 5 TO 20% BY WEIGHT OF A HIGH MOLECULAR WEIGHT VISCOUS COPOLYMER OF ETHYLENE OXIDE AND 1,2-PROPYLENE OXIDE COPOLYMERIZED IN THE PROPORTION OF FORM MORE THAN ONE MOL TO THREE MOLS OF THE FORMER TO ONE MOL OF THE LATTER AND HAVING A MOLECULAR WEIGHT OF LESS THAN 20,000.
Claim 2
Dependent Claim
98 words
AN HYDRAULIC FLUID CONSISTING ESSENTIALLY OF WATER AND A WATER MISCIBLE COMPOUND SELECTED FROM THE GROUP CONSISTING OF GLYCOLS AND GLYCOL ETHERS HAVING FROM 2 TO 14 CARBON ATOMS IN PROPORTIONS RESULTING IN A NON-INFLAMMABLE MIXTURE OF A SUBSTANTIALLY MINIMUM FREEZING POINT AND, AS A SOLUBLE THICKENER, FROM ABOUT 5 TO 20% BY WEIGHT OF A HIGH MOLECULAR WEIGHT VISCOUS COPOLYMER OF ETHYLENE OXIDE AND 1,2-PROPYLENE OXIDE COPOLYMERIZED IN THE PROPORTION OF FORM MORE THAN ONE MOL TO THREE MOLS OF THE FORMER TO ONE MOL OF THE LATTER AND HAVING A MOLECULAR WEIGHT OF LESS THAN 20,000.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-08 | 1956-01-07 | 1956-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-08 | 1960-01-07 | 1960-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-08 | 1964-01-07 | 1964-07-08 | $7700.00 | Window Closed / Lapsed |