Patent US2592447A successfully refreshed from Google Patents.
US2592447A
Expired / Lapsed
US
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Initiation by ammonia or amines of amino acid nu-carbo-anhydride condensation polymerization
Assignee: EIDP Inc
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Filing: 1947-10-04
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Granted: 1952-04-08
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Expires: 1967-10-04
Abstract
No abstract record available.
Inventors
- 👤 Macdonald Robert Neal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:31
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A PROCESS FOR THE PREPARATION OF A LINEAR AMINO ACID POLYMER FROM THE N-CARBONANHYDRIDE OF AN AMINO CARBOXYLIC ACID OF RADICAL LENGTH FROM 3 TO 4 WHICH COMPRISES BRINGING SAID N-CARBONANHYDRIDE IN CONTACT WITH, AS POLYMERIZATION INITIATOR, AN AMINE HAVING HYDROGEN, ON AMINO NITROGEN AS ITS ONLY ACTIVE HYDROGEN, HAVING HYDROGEN AND NOT MORE THAN ONE AROMATIC RADICAL ON AT LEAST ONE AMINO NITROGEN, AND HAVING AT MOST TWO HYDROGEN BEARING AMINO GROUPS, SAID AMINE BEING PRESENT IN THE AMOUNT OF 0.001 TO 1.0 MOLE PER CENT, BASED ON THE TOTAL N-CARBOANHYDRIDA PRESENT.
Claim 2
Dependent Claim
93 words
A PROCESS FOR THE PREPARATION OF A LINEAR AMINO ACID POLYMER FROM THE N-CARBONANHYDRIDE OF AN AMINO CARBOXYLIC ACID OF RADICAL LENGTH FROM 3 TO 4 WHICH COMPRISES BRINGING SAID N-CARBONANHYDRIDE IN CONTACT WITH, AS POLYMERIZATION INITIATOR, AN AMINE HAVING HYDROGEN, ON AMINO NITROGEN AS ITS ONLY ACTIVE HYDROGEN, HAVING HYDROGEN AND NOT MORE THAN ONE AROMATIC RADICAL ON AT LEAST ONE AMINO NITROGEN, AND HAVING AT MOST TWO HYDROGEN BEARING AMINO GROUPS, SAID AMINE BEING PRESENT IN THE AMOUNT OF 0.001 TO 1.0 MOLE PER CENT, BASED ON THE TOTAL N-CARBOANHYDRIDA PRESENT.
References Cited (Backward Citations)
US2406186A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-08 | 1955-10-08 | 1956-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-08 | 1959-10-08 | 1960-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-08 | 1963-10-08 | 1964-04-08 | $7700.00 | Window Closed / Lapsed |