US3211705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic melt preparation of polyamides with manganous hypophosphite as catalyst
Assignee: EIDP Inc
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Filing: 1960-04-07
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Granted: 1965-10-12
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Expires: 1980-04-07
Abstract
No abstract record available.
Inventors
- 👤 Filon A Gadecki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:52
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
IN THE PROCESS FOR PREPARING A SYNTHETIC LINEAR POLYAMIDE BY MELT POLYMERIZATION OF A DIAMINE WITH A DICARBOXYLIC ACID, THE IMPROVEMENT FOR PREPARING A POLYAMIDE FROM A WEAKLY BASIC DIAMINE HAVING A PK VALUE OF LESS THAN 5.5 WHICH COMPRISES MELT POLYMERIZING AT A TEMPERATURE OF AT LEAST 200*C. AN ANHYDROUS MIXTURE OF SUBSTANTIALLY EQUIVALENT PROPORTIONS OF THE WEAKLY BASIC DIAMINE WITH AN ALIPHATIC DICARBOXYLIC ACID AND 0.01 TO 3.0% BY WEIGHT OF MANGANOUS HYPOPHOSPHITE CATALYST, BASED ON THE WEIGHT OF THE MIXTURE.
Claim 2
Dependent Claim
83 words
IN THE PROCESS FOR PREPARING A SYNTHETIC LINEAR POLYAMIDE BY MELT POLYMERIZATION OF A DIAMINE WITH A DICARBOXYLIC ACID, THE IMPROVEMENT FOR PREPARING A POLYAMIDE FROM A WEAKLY BASIC DIAMINE HAVING A PK VALUE OF LESS THAN 5.5 WHICH COMPRISES MELT POLYMERIZING AT A TEMPERATURE OF AT LEAST 200*C. AN ANHYDROUS MIXTURE OF SUBSTANTIALLY EQUIVALENT PROPORTIONS OF THE WEAKLY BASIC DIAMINE WITH AN ALIPHATIC DICARBOXYLIC ACID AND 0.01 TO 3.0% BY WEIGHT OF MANGANOUS HYPOPHOSPHITE CATALYST, BASED ON THE WEIGHT OF THE MIXTURE.
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) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |