US2705231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing cellulose
Assignee: —
•
Filing: —
•
Granted: 1955-03-29
•
Expires: 1972-03-29
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:09
CPC Classifications
C; C08; C08B; C08B5/00; C08B15/00; C08B15/05; C08B15/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 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 STEP OF REACTING UPON AN CELLULOSE XANTHATE OF A METAL SELECTED FROM THE GROUP CONSISTING OF DI- AND TRI- VALENT METALS OF GROUPS I,II,IV,AND VIII OF THE PERIODIC TABLE, WITH AN AMINE SELECTED FROM THE GROUP CONSISTING OF PRIMARY AND SECONDARY AMINES IN A MIXTURE CONSISTING OF SAID CELLULOSE DERIVATIVE, SAID AMINE, AND WATER.
Claim 2
Independent Claim
81 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 STEP OF REACTING UPON AN CELLULOSE XANTHATE OF A METAL SELECTED FROM THE GROUP CONSISTING OF DI- AND TRI- VALENT METALS OF GROUPS I,II,IV,AND VIII OF THE PERIODIC TABLE, WITH AN AMINE SELECTED FROM THE GROUP CONSISTING OF PRIMARY AND SECONDARY AMINES IN A MIXTURE CONSISTING OF SAID CELLULOSE DERIVATIVE, SAID AMINE, AND WATER.
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) | 1958-03-28 | 1958-09-27 | 1959-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-28 | 1962-09-27 | 1963-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-28 | 1966-09-27 | 1967-03-29 | $7700.00 | Window Closed / Lapsed |