US2623869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear poly-4-amino-1, 2, 4 triazoles heated with a monocarboxylic acid or certain derivatives thereof
Assignee: Acordis UK Ltd
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Filing: 1950-10-27
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Granted: 1952-12-30
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Expires: 1970-10-27
Abstract
No abstract record available.
Inventors
- 👤 Kleinschrod Friedrich Georg
- 👤 Fisher James Wotherspoon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:49
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
PROCESS FOR THE PRODUCTION OF LINEAR POLY-4AMINO-1.2.4-TRIAZOLES, WHICH COMPRISES HEATING TOGETHER REAGENTS WHICH ON HYDROLYSIS YIELD A MIXTURE OF DICARBOXYLIC ACID AND SUFFICIENT HYDRAZINE TO YIELD A POLYMER RESISTANT TO HYDROLYSIS BY HYDROCHLORIC ACID AND, WHEN THE INTRINSIC VISCOSITY OF THE POLYMER, THE HYPERBOLIC LOGARITHM OF THE RELATIVE VISCOSITY OF A META-CRESOL SOLUTION IN A CONCENTRATION OF 1 GRAM OF POLYMER PER 100 CCS. OF SOLUTION, MEASURED AT 2* C., HAS REACHED A VALUE OF AT LEAST 0.25, ADDING A QUANTITY, LESS THAN 14 MOLAR PER CENT BASED ON THE DICARBOXYLIC ACID, OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF MONOCARBOXYLIC ACIDS, THEIR HYDRAZIDES, ESTERS, ANHYDRIDES AND NITRILES, AND CONTINUING THE HEATING UNTIL A POLYMER IS PRODUCED.
Claim 2
Dependent Claim
118 words
PROCESS FOR THE PRODUCTION OF LINEAR POLY-4AMINO-1.2.4-TRIAZOLES, WHICH COMPRISES HEATING TOGETHER REAGENTS WHICH ON HYDROLYSIS YIELD A MIXTURE OF DICARBOXYLIC ACID AND SUFFICIENT HYDRAZINE TO YIELD A POLYMER RESISTANT TO HYDROLYSIS BY HYDROCHLORIC ACID AND, WHEN THE INTRINSIC VISCOSITY OF THE POLYMER, THE HYPERBOLIC LOGARITHM OF THE RELATIVE VISCOSITY OF A META-CRESOL SOLUTION IN A CONCENTRATION OF 1 GRAM OF POLYMER PER 100 CCS. OF SOLUTION, MEASURED AT 2* C., HAS REACHED A VALUE OF AT LEAST 0.25, ADDING A QUANTITY, LESS THAN 14 MOLAR PER CENT BASED ON THE DICARBOXYLIC ACID, OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF MONOCARBOXYLIC ACIDS, THEIR HYDRAZIDES, ESTERS, ANHYDRIDES AND NITRILES, AND CONTINUING THE HEATING UNTIL A POLYMER IS PRODUCED.
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) | 1955-12-30 | 1956-06-30 | 1956-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-30 | 1960-06-30 | 1960-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-30 | 1964-06-30 | 1964-12-30 | $7700.00 | Window Closed / Lapsed |