Patent US2404610A successfully refreshed from Google Patents.
Patent US2598372A successfully refreshed from Google Patents.
US2598372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polymeric compounds from anhydrocarboxy-alpha-amino-carboxylic acids in nitrobenzene
Assignee: Akzo Nobel UK PLC
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Filing: 1950-05-01
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Granted: 1952-05-27
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Expires: 1970-05-01
Abstract
No abstract record available.
Inventors
- 👤 Hanby William Edward
- 👤 Waley Stephen Gerald
- 👤 Watson James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:47
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A PROCESS FOR THE PRODUCTION OF POLYPEPTIDES BY POLYMERISING AN ANHYDROCARBOXY-ALPHAAMINO-CARBOXYLIC ACID IN THE PRESENCE OF AN INITIATOR HAVING AN ACTIVE HYDROGEN ATOM WHEREIN THE POLYMERIZATION IS EFFECTED IN NITRO-BENZENE AS A SOLVENT FOR THE ANHYDROCARBOXY-ALPHAAMINO-CARBOXYLIC ACID AND FOR THE POLYPEPTIDE, AND THE INITIATOR IS USED IN A PROPORTION SUCH THAT THE MOLECULAR RATIO OF INITIATOR TO ANHYDROCARBOXY-ALPHA-AMINO-CARBOXYLIC ACID IS 1 TO AT LEAST 350, WHEREBY THE PRODUCT OBTAINED IS FIBREFORMING.
Claim 2
Dependent Claim
71 words
A PROCESS FOR THE PRODUCTION OF POLYPEPTIDES BY POLYMERISING AN ANHYDROCARBOXY-ALPHAAMINO-CARBOXYLIC ACID IN THE PRESENCE OF AN INITIATOR HAVING AN ACTIVE HYDROGEN ATOM WHEREIN THE POLYMERIZATION IS EFFECTED IN NITRO-BENZENE AS A SOLVENT FOR THE ANHYDROCARBOXY-ALPHAAMINO-CARBOXYLIC ACID AND FOR THE POLYPEPTIDE, AND THE INITIATOR IS USED IN A PROPORTION SUCH THAT THE MOLECULAR RATIO OF INITIATOR TO ANHYDROCARBOXY-ALPHA-AMINO-CARBOXYLIC ACID IS 1 TO AT LEAST 350, WHEREBY THE PRODUCT OBTAINED IS FIBREFORMING.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-27 | 1955-11-26 | 1956-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-27 | 1959-11-26 | 1960-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-27 | 1963-11-26 | 1964-05-27 | $7700.00 | Window Closed / Lapsed |