US2654726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polysulphone aminotriazoles
Assignee: Acordis UK Ltd
•
Filing: 1950-06-09
•
Granted: 1953-10-06
•
Expires: 1970-06-09
Abstract
No abstract record available.
Inventors
- 👤 Fisher James Wotherspoon
- 👤 Wheatley Edward William
- 👤 May Geoffrey Bilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:48
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
PROCESS FOR THE PRODUCTION OF A POLYSULPHONE-AMINOTRIAZOLE, WHICH COMPRISES HEATING A DIHYDRAZIDE OF A SULPHONE DICARBOXYLIC ACID, WHOSE CARBOXYLIC GROUPS ARE ITS SOLE REACTIVE GROUPS AND IN WHICH SULPHONE AND CARBOXYLIC GROUPS ARE SEPARATED FROM EACH OTHER BY AT LEAST THREE METHYLENE GROUPS, TOGETHER WITH SUFFICIENT HYDRAZINE TO YIELD A POLYMER RESISTANT TO HYDROLYSIS BY HYDROCHLORIC ACID, AND CONTINUING THE HEATING UNTIL SUCH POLYMER IS PRODUCED.
Claim 2
Dependent Claim
66 words
PROCESS FOR THE PRODUCTION OF A POLYSULPHONE-AMINOTRIAZOLE, WHICH COMPRISES HEATING A DIHYDRAZIDE OF A SULPHONE DICARBOXYLIC ACID, WHOSE CARBOXYLIC GROUPS ARE ITS SOLE REACTIVE GROUPS AND IN WHICH SULPHONE AND CARBOXYLIC GROUPS ARE SEPARATED FROM EACH OTHER BY AT LEAST THREE METHYLENE GROUPS, TOGETHER WITH SUFFICIENT HYDRAZINE TO YIELD A POLYMER RESISTANT TO HYDROLYSIS BY HYDROCHLORIC ACID, AND CONTINUING THE HEATING UNTIL SUCH POLYMER IS PRODUCED.
References Cited (Backward Citations)
US2191556A
Cited
US2201884A
Cited
FR889303A
Cited
GB612609A
Cited
US2512601A
Cited
US2571251A
Cited
US2534347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-05 | 1957-04-06 | 1957-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-05 | 1961-04-06 | 1961-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-05 | 1965-04-06 | 1965-10-06 | $7700.00 | Window Closed / Lapsed |