Patent US2957837A successfully refreshed from Google Patents.
US2957837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester resin compositions of long chain diethylenically unsaturated acids
Assignee: Shell Development Co
•
Filing: 1956-11-05
•
Granted: 1960-10-25
•
Expires: 1976-11-05
Abstract
No abstract record available.
Inventors
- 👤 Curtis W Smith
- 👤 Clayton A May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:32
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/676; C08G63/02; C08G63/12; C08G63/52; C08G63/54
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
35 words
A RESIN COMPOSITION HAVING AN ACID NUMBER RANGING FROM ABOUT 5 TO ABOUT 50 COMPRISING THE REACTION PRODUCT OF PHTHALIC ANHYDRIDE, GLYCEROL, SOYA FATTY ACIDS AND 5% TO 95% OF AN ACID HAVING THE FORMULA
References Cited (Backward Citations)
US2352461A
Cited
US2394909A
Cited
US2650211A
Cited
US2623033A
Cited
US2811551A
Cited
US2680713A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |