US2500160A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic lubricants
Assignee: —
•
Filing: —
•
Granted: 1950-03-14
•
Expires: 1967-03-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:03
CPC Classifications
C; C10; C10M; C10M107/00; C10M107/02; C10M107/12; C10M2205/00; C10M2205/02; C10M2205/028; C10M2205/0285; C10N; C10N2020/00; C10N2020/01; C10N2020/011; C10N2020/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
THE METHOD FOR PREPARING AN OIL OF LUBRICATING VISCOSITY CHARACTERIZED BY A VISCOSITY INDEX OF AT LEAST ABOUT 100 AND LOW POUR POINT, WHICH COMPRISES: THERMALLY AND NON-CATALYTICALLY HEATING A CHANGE CONSISTING ESSENTIALLY OF A STRAIGHT CHAIN NORMAL, ALPHA MONO-OLEFIN HAVING BETWEEN FIVE AND ABOUT TWELVE CARBON ATOMS AND STYRENE, AT A TEMPERATURE FROM ABOUT 500*F., TO ABOUT 700*F. FOR A JPERIOD OF TIME FROM ABOUT 10 HOURS TO ABOUT ONE HOUR, RESPECTIVELY, THE MOLAR PROPORTION OF SAID NORMAL, ALPHA MONO-OLEFIN IN SAID CHARGE BEING SUBSTANTIALLY GREATER THAN THE MOLAR PROPORTION OF STYRENE THEREIN.
Claim 2
Independent Claim
94 words
THE METHOD FOR PREPARING AN OIL OF LUBRICATING VISCOSITY CHARACTERIZED BY A VISCOSITY INDEX OF AT LEAST ABOUT 100 AND LOW POUR POINT, WHICH COMPRISES: THERMALLY AND NON-CATALYTICALLY HEATING A CHANGE CONSISTING ESSENTIALLY OF A STRAIGHT CHAIN NORMAL, ALPHA MONO-OLEFIN HAVING BETWEEN FIVE AND ABOUT TWELVE CARBON ATOMS AND STYRENE, AT A TEMPERATURE FROM ABOUT 500*F., TO ABOUT 700*F. FOR A JPERIOD OF TIME FROM ABOUT 10 HOURS TO ABOUT ONE HOUR, RESPECTIVELY, THE MOLAR PROPORTION OF SAID NORMAL, ALPHA MONO-OLEFIN IN SAID CHARGE BEING SUBSTANTIALLY GREATER THAN THE MOLAR PROPORTION OF STYRENE THEREIN.
References Cited (Backward Citations)
US2111831A
Cited
US2442644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |