US2910466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing cellulose thiourethanes
Assignee: Akzo Nobel UK PLC
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Filing: 1956-02-06
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Granted: 1959-10-27
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Expires: 1976-02-06
Abstract
No abstract record available.
Inventors
- 👤 William R Watt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:32
CPC Classifications
C; C08; C08B; C08B9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A METHOD FOR THE PRODUCTION OF CELLULOSE THIOURETHANES IN WHICH AT LEAST ONE HYDROGEN ATOM OF THE AMIDO GROUP IS REPLACED BY AN ORGANIC RADICAL COMPRISING THE STEPS OF TREATING A CELLULOSE XANTHATE SUCCESSIVELY WITH ANACID AND A SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF DI- AND TRI-VALENT METALS OF GROUP 1, 11, IV, PRODUCT WITH AN AMINE SELECTED FROM THE GROUP CONSISTING OF PRIMARY AND SECONDARY AMINES, SAID ACID, SALT AND AMINE BEING ADDED IN SUCH PROPORTIONS THAT THE PH OF THE REACTION MIXTURE IS BETWEEN ABOUT 5 AND 9.
Claim 2
Independent Claim
94 words
A METHOD FOR THE PRODUCTION OF CELLULOSE THIOURETHANES IN WHICH AT LEAST ONE HYDROGEN ATOM OF THE AMIDO GROUP IS REPLACED BY AN ORGANIC RADICAL COMPRISING THE STEPS OF TREATING A CELLULOSE XANTHATE SUCCESSIVELY WITH ANACID AND A SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF DI- AND TRI-VALENT METALS OF GROUP 1, 11, IV, PRODUCT WITH AN AMINE SELECTED FROM THE GROUP CONSISTING OF PRIMARY AND SECONDARY AMINES, SAID ACID, SALT AND AMINE BEING ADDED IN SUCH PROPORTIONS THAT THE PH OF THE REACTION MIXTURE IS BETWEEN ABOUT 5 AND 9.
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) | 1962-10-26 | 1963-04-27 | 1963-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-26 | 1967-04-27 | 1967-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-26 | 1971-04-27 | 1971-10-27 | $7700.00 | Window Closed / Lapsed |