US2566623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic fluid composition
Assignee: Douglas Aircraft Co Inc
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Filing: 1948-04-06
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Granted: 1951-09-04
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Expires: 1968-04-06
Abstract
No abstract record available.
Inventors
- 👤 Douglas H Moreton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:47
CPC Classifications
C; C10; C10M; C10M3/00; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/042; C10N; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A NON-FLAMMABLE HYDRAULIC FLUID FOR DYNAMIC HYDRAULIC SYSTEMS OF AIRCRAFT HAVING GOOD LOW TEMPERATURE PROPERTIES AND HAVING AN AUTOGENOUS IGNITION TEMPERATURE ABOVE 890* F. AND A POUR POINT LOWER THAN -40* F. CONSISTING OF AN ORGANIC PHOSPHATE HAVING THREE HYDROCARBON RADICALS, TWO OF WHICH ARE MEMBERS OF THE GROUP CONSISTING OF PHENYL, CRESYL AND XYLYL RADICALS AND THE OTHER HYDROCARBON RADICAL A MEMBER OF THE GROUP CONSISTING OF CRESYL, XYLYL AND A SATURATED ALKYL RADICAL HAVING FROM 6 TO 10 CARBON ATOMS; AND A RELATIVE PROPORTION OF FROM 20 TO 60 VOLUME PER CENT OF A TRI-ALIPHATIC PHOSPHATE COMPOUNDED THEREWITH SELECTED FROM THE GROUP CONSISTING OF TRIALKYL PHOSPHATES IN WHICH THE ALKYL GROUPS ARE SATURATED BRANCHED CHAINS WITH FROM 4 TO 9 CARBON ATOMS, TRIALKYL PHOSPHATES IN WHICH THE ALKYL GROUPS ARE SATURATED STRAIGHT CHAINS WITH FROM 4 TO 6 CARBON ATOMS, AND TRIBUTOXYETHYL PHOSPHATE.
Claim 2
Dependent Claim
145 words
A NON-FLAMMABLE HYDRAULIC FLUID FOR DYNAMIC HYDRAULIC SYSTEMS OF AIRCRAFT HAVING GOOD LOW TEMPERATURE PROPERTIES AND HAVING AN AUTOGENOUS IGNITION TEMPERATURE ABOVE 890* F. AND A POUR POINT LOWER THAN -40* F. CONSISTING OF AN ORGANIC PHOSPHATE HAVING THREE HYDROCARBON RADICALS, TWO OF WHICH ARE MEMBERS OF THE GROUP CONSISTING OF PHENYL, CRESYL AND XYLYL RADICALS AND THE OTHER HYDROCARBON RADICAL A MEMBER OF THE GROUP CONSISTING OF CRESYL, XYLYL AND A SATURATED ALKYL RADICAL HAVING FROM 6 TO 10 CARBON ATOMS; AND A RELATIVE PROPORTION OF FROM 20 TO 60 VOLUME PER CENT OF A TRI-ALIPHATIC PHOSPHATE COMPOUNDED THEREWITH SELECTED FROM THE GROUP CONSISTING OF TRIALKYL PHOSPHATES IN WHICH THE ALKYL GROUPS ARE SATURATED BRANCHED CHAINS WITH FROM 4 TO 9 CARBON ATOMS, TRIALKYL PHOSPHATES IN WHICH THE ALKYL GROUPS ARE SATURATED STRAIGHT CHAINS WITH FROM 4 TO 6 CARBON ATOMS, AND TRIBUTOXYETHYL PHOSPHATE.
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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) | 1954-09-03 | 1955-03-05 | 1955-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-03 | 1959-03-05 | 1959-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-03 | 1963-03-05 | 1963-09-04 | $7700.00 | Window Closed / Lapsed |