US2650211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters of alkenyl-succinic acids
Assignee: Shell Development Co
•
Filing: 1949-05-02
•
Granted: 1953-08-25
•
Expires: 1969-05-02
Abstract
No abstract record available.
Inventors
- 👤 Dannenberg Hans
- 👤 James R Scheibli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:19
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/52; C07C69/602
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A POLYESTER OBTAINED BY HEATING AND REACTING OCTADECENYLSUCCINIC ANHYDRIDE WITH AN EQUAL MOLECULAR TO 30% EXCESS OF DIETHYLENE GLYCOL.
Claim 2
Dependent Claim
19 words
A POLYESTER OBTAINED BY HEATING AND REACTING OCTADECENYLSUCCINIC ANHYDRIDE WITH AN EQUAL MOLECULAR TO 30% EXCESS OF DIETHYLENE GLYCOL.
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) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |