Patent US4891643A successfully refreshed from Google Patents.
Patent US2600798A successfully refreshed from Google Patents.
US2600798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Esters of thiophene-modified maleic anhydride-styrene copolymers and oil compositions containing the same
Assignee: ExxonMobil Oil Corp
•
Filing: 1949-09-29
•
Granted: 1952-06-17
•
Expires: 1969-09-29
Abstract
No abstract record available.
Inventors
- 👤 Ferdinand P Otto
- 👤 Orland M Reiff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:13
CPC Classifications
C; C08; C08F; C08F222/00; C08F222/04; C08F222/06; C08F222/08; C10; C10M; C10M145/00; C10M145/02; C10M145/10; C10M2221/00; C10M2221/02; C10N; C10N2040/00; C10N2040/02; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A MINERAL LUBRICATING OIL COMTAINING A MINOR AMOUNT, SUFFICIENT TO IMPROVE THE VISCOSITY INDEX OF SAID OIL, OF A REACTION PRODUCT PREPARED BY THE STEPS OF (1) REACTING TOGETHER (A) ABOUT 1 MOL OF MALEIC ANHYDRIDE, (B) ABOUT 1 MOL OF STYRENE AND (C) FROM ABOUT 1 TO ABOUT 10 MOLS OF A THIOPHENE COMPOUND SELECTED FROM THE GROUP CONSISTING OF THIOPHENE AND ALKYL-SUBSTITUTED THIOPHENES, AT A TEMPERATURE OF FROM ABOUT 75* C. TO ABOUT 125* C., AND (2) ESTERIFYING THE PRODUCT OBTAINED IN STEP 1 WITH A PRIMARY, NORMAL, SATURATED ALCOHOL HAVING FROM ABOUT 10 TO ABOUT 18 CARBON ATOMS.
Claim 2
Dependent Claim
101 words
A MINERAL LUBRICATING OIL COMTAINING A MINOR AMOUNT, SUFFICIENT TO IMPROVE THE VISCOSITY INDEX OF SAID OIL, OF A REACTION PRODUCT PREPARED BY THE STEPS OF (1) REACTING TOGETHER (A) ABOUT 1 MOL OF MALEIC ANHYDRIDE, (B) ABOUT 1 MOL OF STYRENE AND (C) FROM ABOUT 1 TO ABOUT 10 MOLS OF A THIOPHENE COMPOUND SELECTED FROM THE GROUP CONSISTING OF THIOPHENE AND ALKYL-SUBSTITUTED THIOPHENES, AT A TEMPERATURE OF FROM ABOUT 75* C. TO ABOUT 125* C., AND (2) ESTERIFYING THE PRODUCT OBTAINED IN STEP 1 WITH A PRIMARY, NORMAL, SATURATED ALCOHOL HAVING FROM ABOUT 10 TO ABOUT 18 CARBON ATOMS.
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) | 1955-06-17 | 1955-12-17 | 1956-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-17 | 1959-12-17 | 1960-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-17 | 1963-12-17 | 1964-06-17 | $7700.00 | Window Closed / Lapsed |