US2921040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxide resin composition
Assignee: Shell Development Co
•
Filing: 1953-10-08
•
Granted: 1960-01-12
•
Expires: 1973-10-08
Abstract
No abstract record available.
Inventors
- 👤 Clayton A May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:41
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/62; C08G59/625; C08G59/50; C08L; C08L63/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A HARD CURED PRODUCT OBTAINED BY REACTING A MIXTURE COMPRISING (1) GLYCIDYL POLYETHER OF 2,2-BIS(4HYDROXYPHENYL)PROPANE HAVING A 1,2-EPOXY EQUIVALENCY OF ABOUT 1.8 (2) A SUBSTANTIAL PROPORTION OF A MEMBER OF THE GROUP CONSISTING OF (A) CASTOR OIL, (B) AIR BLOWN CASTOR OIL, AND (C) CASTOR OIL WHICH HAS BEEN ACETYLATED TO THE EXTENT OF 51.5% TO 79% OF THE THEORETICAL, AND (3) AN AMINE EPOXY CURING AGENT.
Claim 2
Dependent Claim
67 words
A HARD CURED PRODUCT OBTAINED BY REACTING A MIXTURE COMPRISING (1) GLYCIDYL POLYETHER OF 2,2-BIS(4HYDROXYPHENYL)PROPANE HAVING A 1,2-EPOXY EQUIVALENCY OF ABOUT 1.8 (2) A SUBSTANTIAL PROPORTION OF A MEMBER OF THE GROUP CONSISTING OF (A) CASTOR OIL, (B) AIR BLOWN CASTOR OIL, AND (C) CASTOR OIL WHICH HAS BEEN ACETYLATED TO THE EXTENT OF 51.5% TO 79% OF THE THEORETICAL, AND (3) AN AMINE EPOXY CURING AGENT.
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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) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |