US2657181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic fluid containing poly(oxyethylene-oxy-1, 2 propylene) ethers of glycerol
Assignee: Dow Chemical Co
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Filing: 1951-06-06
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Granted: 1953-10-27
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Expires: 1971-06-06
Abstract
No abstract record available.
Inventors
- 👤 John C Van Horn
- 👤 Edward O Ohlmann
- 👤 James D Klinger
- 👤 John H Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:16
CPC Classifications
C; C10; C10M; C10M173/00; C10M173/02; C10M2201/00; C10M2201/02; C10M2201/087; C10M2207/00; C10M2207/02; C10M2207/021; C10M2207/022; C10M2207/023; C10M2207/04; C10M2207/046; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/105; C10M2209/107; C10N; C10N2020/00; C10N2020/01; C10N2040/00; C10N2040/08; C10N2050/00; C10N2050/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A HYDRAULIC FLUID CONSISTING ESSENTIALLY OF (A) FROM 10 TO 30 PER CENT BY WEIGHT OF A MIXTURE OF TRIHYDROXY MIXED POLY (OXYETHYLENE-OXY1.2 PROPYLENE) ETHERS OF GLYCEROL IN WHICH THE OXYETHYLENE GROUPS REPRESENT FROM 20 TO 80 MOL PER CENT OF THE TOTAL OXYALKYLENE GROUPS AND IN WHICH THERE IS AN AVERAGE OF AT LEAST 8 OXYALKYLENE GROUPS PER GLYCEROL MOLECULE, (B) FROM 55 TO 90 PER CENT OF AN ACYCLIC MONOHYDRIC ALCOHOL CONTAINING FROM 3 TO 10 CARBON ATOMS PER MOLECULE AND (C) UP TO 30 PER CENT OF AN ACYLIC GLYCOL CONTAINING FROM 2 TO 6 CARBON ATOMS PER MOLECULE.
Claim 2
Dependent Claim
102 words
A HYDRAULIC FLUID CONSISTING ESSENTIALLY OF (A) FROM 10 TO 30 PER CENT BY WEIGHT OF A MIXTURE OF TRIHYDROXY MIXED POLY (OXYETHYLENE-OXY1.2 PROPYLENE) ETHERS OF GLYCEROL IN WHICH THE OXYETHYLENE GROUPS REPRESENT FROM 20 TO 80 MOL PER CENT OF THE TOTAL OXYALKYLENE GROUPS AND IN WHICH THERE IS AN AVERAGE OF AT LEAST 8 OXYALKYLENE GROUPS PER GLYCEROL MOLECULE, (B) FROM 55 TO 90 PER CENT OF AN ACYCLIC MONOHYDRIC ALCOHOL CONTAINING FROM 3 TO 10 CARBON ATOMS PER MOLECULE AND (C) UP TO 30 PER CENT OF AN ACYLIC GLYCOL CONTAINING FROM 2 TO 6 CARBON ATOMS PER MOLECULE.
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) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |