Patent US3297656A successfully refreshed from Google Patents.
US3297656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamides from n, n'-diphenyldiamines
Assignee: Eastman Kodak Co
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Filing: 1965-10-11
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Granted: 1967-01-10
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Expires: 1985-10-11
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:55
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A HIGHLY POLYMER LINEAR POLYAMIDE MELTING ABOVE ABOUT 150*C. AND HAVING AN INHERENT VISCOSITY OF AT LEAST 0.4, BEING POLYAMIDE OF (1) AT LEAST ONE BIFUNCTIONAL DICARBOXYLIC ACID CONSTITUENT COMPRISING AT LEAST ABOUT 40 MOLE PERCENT TEREPHTHALIC ACID AND SELECTED FROM THE GROUP CONSISTING OF MONONUCLEAR AROMATIC ACIDS HAVING FROM 8 TO 20 CARBON ATOMS AND AHVNG THEIR CARBOXYL RADICALS ATTACHED TO A BENZENE RING, STRAIGHT CHAIN ALIPHATIC ACIDS HAVING FROM 2 TO 10 CARBON ATOMS IN A STRAIGHT CHAIN, SYMMETRICAL BRANCHED CHAIN ALIPHATIC ACIDS HAVING FROM 5 TO 6 CARBON ATOMS, AND ALICYCLIC ACIDS HAVING FROM 8 TO 30 CARBON ATOMS, AND (2) AT LEAST ONE BIFUNCTIONAL DIAMINE CONSTITUENT OF WHICH AT LEAST 50 MOLE PERCENT IS A N,N''-DIARYL DIAMINE HAVING THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
125 words
A HIGHLY POLYMER LINEAR POLYAMIDE MELTING ABOVE ABOUT 150*C. AND HAVING AN INHERENT VISCOSITY OF AT LEAST 0.4, BEING POLYAMIDE OF (1) AT LEAST ONE BIFUNCTIONAL DICARBOXYLIC ACID CONSTITUENT COMPRISING AT LEAST ABOUT 40 MOLE PERCENT TEREPHTHALIC ACID AND SELECTED FROM THE GROUP CONSISTING OF MONONUCLEAR AROMATIC ACIDS HAVING FROM 8 TO 20 CARBON ATOMS AND AHVNG THEIR CARBOXYL RADICALS ATTACHED TO A BENZENE RING, STRAIGHT CHAIN ALIPHATIC ACIDS HAVING FROM 2 TO 10 CARBON ATOMS IN A STRAIGHT CHAIN, SYMMETRICAL BRANCHED CHAIN ALIPHATIC ACIDS HAVING FROM 5 TO 6 CARBON ATOMS, AND ALICYCLIC ACIDS HAVING FROM 8 TO 30 CARBON ATOMS, AND (2) AT LEAST ONE BIFUNCTIONAL DIAMINE CONSTITUENT OF WHICH AT LEAST 50 MOLE PERCENT IS A N,N''-DIARYL DIAMINE HAVING THE FOLLOWING FORMULA:
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) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |