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US2880230A
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Diamine salts of pyromellitic acid diester
Assignee: EIDP Inc
•
Filing: 1955-06-13
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Granted: 1959-03-31
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Expires: 1975-06-13
Abstract
No abstract record available.
Inventors
- 👤 Edwards Walter Murray
- 👤 Robinson Ivan Maxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:29
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A DIAMINE SALT OF A PYROMELLITIC DIESTER, HAVING ESTERIFIED CARBOXYLS ON NON-ADJACENT CARBON ATOMS, SAID DIAMINE HAVING THE FORMULA NH2RNH2 WHEREIN R IS AN ALKYLENE GROUP WITH ITS TERMINAL VALENCE BONDS SEPARATED BY A CHAIN OF FROM 7 TO 10 CARBON ATOMS, THE QUANTITIES OF DIAMINE AND DIESTER COMPONENTS IN SAID SALT BEING SUBSTANTIALLY EQUIMOLAR.
Claim 2
Dependent Claim
55 words
A DIAMINE SALT OF A PYROMELLITIC DIESTER, HAVING ESTERIFIED CARBOXYLS ON NON-ADJACENT CARBON ATOMS, SAID DIAMINE HAVING THE FORMULA NH2RNH2 WHEREIN R IS AN ALKYLENE GROUP WITH ITS TERMINAL VALENCE BONDS SEPARATED BY A CHAIN OF FROM 7 TO 10 CARBON ATOMS, THE QUANTITIES OF DIAMINE AND DIESTER COMPONENTS IN SAID SALT BEING SUBSTANTIALLY EQUIMOLAR.
References Cited (Backward Citations)
US2710853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-30 | 1962-09-29 | 1963-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-30 | 1966-09-29 | 1967-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-30 | 1970-09-29 | 1971-03-31 | $7700.00 | Window Closed / Lapsed |