Patent US3054773A successfully refreshed from Google Patents.
US3054773A
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Poly(diphenyl ether-p-xylylenes) as viscosity index improving agents
Assignee: Individual
•
Filing: 1958-11-12
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Granted: 1962-09-18
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Expires: 1978-11-12
Abstract
No abstract record available.
Inventors
- 👤 Donovan R Wilgus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:47
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C08; C08G; C08G61/00; C08G61/12; C08G61/121; C10M2203/00; C10M2203/06; C10M2205/00; C10M2205/22; C10M2207/00; C10M2207/04; C10M2209/00; C10M2209/02; C10M2209/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A POLYMERIC COMPOUND HAVING A MOLECULAR WEIGHT IN THE RANGE OF 10,000 TO ABOUT 50,000 OBTAINED BY REACTING A DIPHENYL ETHER WITH AN A,A''-DICHLORO-P-XYLENE IN THE THE RANGE OF A FRIEDEL-CRAFTS CATALYST AT TEMPERATURES IN THE RANGE OF 90* C. TO 120* C., WHEREIN THE MOL RATIO OF SAID DIPHENYL ETHER TO SAID XYLENE IS FROM 10:1 TO 1:1 AND REMOVING THE HCI OBTAINED BY SAID REACTION.
Claim 2
Dependent Claim
67 words
A POLYMERIC COMPOUND HAVING A MOLECULAR WEIGHT IN THE RANGE OF 10,000 TO ABOUT 50,000 OBTAINED BY REACTING A DIPHENYL ETHER WITH AN A,A''-DICHLORO-P-XYLENE IN THE THE RANGE OF A FRIEDEL-CRAFTS CATALYST AT TEMPERATURES IN THE RANGE OF 90* C. TO 120* C., WHEREIN THE MOL RATIO OF SAID DIPHENYL ETHER TO SAID XYLENE IS FROM 10:1 TO 1:1 AND REMOVING THE HCI OBTAINED BY SAID REACTION.
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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) | 1965-09-17 | 1966-03-19 | 1966-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-17 | 1970-03-19 | 1970-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-17 | 1974-03-19 | 1974-09-18 | $7700.00 | Window Closed / Lapsed |