Patent US3175976A successfully refreshed from Google Patents.
US3175976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic transmission fluids
Assignee: —
•
Filing: —
•
Granted: 1965-03-30
•
Expires: 1982-03-30
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:39
CPC Classifications
C; C10; C10M; C10M161/00; C10M2205/00; C10M2205/02; C10M2205/026; C10M2205/17; C10M2205/173; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/024; C10M2207/026; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/286; C10M2215/00; C10M2215/02; C10M2215/06; C10M2215/062; C10M2217/00; C10M2217/02; C10M2217/028; C10M2217/06; C10M2219/00; C10M2219/04; C10M2219/046; C10M2221/00; C10M2221/04; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10M2229/00; C10M2229/02; C10M2229/04; C10M2229/05; C10N; C10N2010/00; C10N2010/04; C10N2010/08; C10N2040/00; C10N2040/08; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
AN AUTOMATIC TRANSMISSION FLUID CONSISTING ESSENTIALLY OF A HYDROCARBON OIL HAVING A VISCOSITY RANGE FROM 39 SSU TO 50 SSU AT 210*F., AND A VISCOSITY INDEX IN THE RANGE OF 60 TO 80, FROM 2 TO 8 MM./KG. OF A ZINC MIXED DIALKYL DITHIOPHOSPHATE WHEREIN ONE OF THE ALKYL RADICALS CONTAINS NO MORE THAN 4 CARBON ATOMS, AND THE OTHER ALKYL RADICAL CONTAINS 6 CARBON ATOMS, FROM 2% TO 6% BY WEIGHT OF AN OIL SOLUBLE ALKYL METHACRYLATE-VINYL PYRROLIDONE COPOLYMER HAVING A MOLECULAR WEIGHT FROM 100,000 TO 500,000, AND FROM 0.1% TO 0.5% OF A 2,6DI(TERTIARYBUTYL)-P-CRESOL WHEREIN THE WEIGHT RATIO OF SAID PYRROLIDONE COPOLYMER TO SAID CRESOL IS FROM 10:1 TO 5:1, AND THE WEIGHT RATIO OF SAID PYRROLIDONE COPOLYMER TO SAID DITHIOPHOSPHATE IS FROM 5:1 TO 40:1.
Claim 2
Dependent Claim
128 words
AN AUTOMATIC TRANSMISSION FLUID CONSISTING ESSENTIALLY OF A HYDROCARBON OIL HAVING A VISCOSITY RANGE FROM 39 SSU TO 50 SSU AT 210*F., AND A VISCOSITY INDEX IN THE RANGE OF 60 TO 80, FROM 2 TO 8 MM./KG. OF A ZINC MIXED DIALKYL DITHIOPHOSPHATE WHEREIN ONE OF THE ALKYL RADICALS CONTAINS NO MORE THAN 4 CARBON ATOMS, AND THE OTHER ALKYL RADICAL CONTAINS 6 CARBON ATOMS, FROM 2% TO 6% BY WEIGHT OF AN OIL SOLUBLE ALKYL METHACRYLATE-VINYL PYRROLIDONE COPOLYMER HAVING A MOLECULAR WEIGHT FROM 100,000 TO 500,000, AND FROM 0.1% TO 0.5% OF A 2,6DI(TERTIARYBUTYL)-P-CRESOL WHEREIN THE WEIGHT RATIO OF SAID PYRROLIDONE COPOLYMER TO SAID CRESOL IS FROM 10:1 TO 5:1, AND THE WEIGHT RATIO OF SAID PYRROLIDONE COPOLYMER TO SAID DITHIOPHOSPHATE IS FROM 5:1 TO 40:1.
References Cited (Backward Citations)
US2364283A
Cited
US2710842A
Cited
GB760554A
Cited
US2830956A
Cited
US2883339A
Cited
GB808665A
Cited
US2866729A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |