US3791976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for rapidly operating ground equipment embodying hydraulic system using all season petroleum hydraulic fluid
Assignee: United States Department of the Army
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Filing: 1971-11-11
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Granted: 1974-02-12
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Expires: 1991-11-11
Abstract
Abstract A SINGLE HYDRAULIC FLUID PETROLEUM BASE BLEND CONSISTING OF A HIGHLY REFINED PETROLEUM FRACTION OF A NAPHTHENIC COASTAL CRUDE, SAID CRUDE BEING HYDROGENATED, SOLVENT REFINED AND FRACTIONATED, SAID BLEND HAVING A VISCOSITY 1.32 CETISTOKES AT 98.9* C. AND 381 CENTISTOKES AT -53.9* C. AND POSSESSING GOOD OXIDATION STABILITY, GOOD RUST PROTECTION AND GOOD ANTIWEAR PROPERTIES ACHIEVED BY ADDITION OF TRICRESYL PHOSPHATE, PHENYL-1-NAPHTHYLAMINE AND BARIUM DINONYLNAPHTHYLENE SULFONATE, IS APPLIED TO THE HYDRAULIC SYSTEM OF GROUND EQUIPMENT, AND THE TURRET SYSTEM OF SAID GROUND EQUIPMENT IS OPERATED CONTINUOUSLY FOR AT LEAST 213 HOURS.
Inventors
- 👤 J Messina
- 👤 A Mertwoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:54
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2215/00; C10M2215/02; C10M2215/06; C10M2215/064; C10M2215/065; C10M2219/00; C10M2219/04; C10M2219/044; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10N; C10N2040/00; C10N2040/08
Claims Analysis
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References Cited (Backward Citations)
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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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |