US2497526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of treating a polymeric nitrile with hydrazine
Assignee: EIDP Inc
•
Filing: 1948-02-26
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Granted: 1950-02-14
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Expires: 1968-02-26
Abstract
No abstract record available.
Inventors
- 👤 Harold W Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:40
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/673; D06P1/67308; C; C08; C08F; C08F8/00; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A PROCESS WHICH COMPRISES CONTACTING A POLYMERIC NITRILE WITH HYDRAZINE AT A TEMPERATURE OF FROM 20* TO 180*C. UNTIL THE DYE RECEPTIVITY OF SAID POLYMERIC NITRILE IS SUBSTANTIALLY INCREASED, SAID POLYMERIC NITRILE BEING THE POLYMER OF AN UNSATURATED MONONITRILE OF THE FORMULA H2C=CRCN WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND MONOVALENT HYDROCARBON RADICALS.
Claim 2
Dependent Claim
57 words
A PROCESS WHICH COMPRISES CONTACTING A POLYMERIC NITRILE WITH HYDRAZINE AT A TEMPERATURE OF FROM 20* TO 180*C. UNTIL THE DYE RECEPTIVITY OF SAID POLYMERIC NITRILE IS SUBSTANTIALLY INCREASED, SAID POLYMERIC NITRILE BEING THE POLYMER OF AN UNSATURATED MONONITRILE OF THE FORMULA H2C=CRCN WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND MONOVALENT HYDROCARBON RADICALS.
References Cited (Backward Citations)
US2436926A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |