Patent US2559914A successfully refreshed from Google Patents.
US2559914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of cellulose sulfuric acid esters
Assignee: Individual
•
Filing: 1946-12-13
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Granted: 1951-07-10
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Expires: 1966-12-13
Abstract
No abstract record available.
Inventors
- 👤 Frank Georges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:53
CPC Classifications
C; C08; C08B; C08B5/00; C08B5/14; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PROCESS FOR THE PRODUCTION OF FIBROUS CELLULOSE SULFATE WHICH COMPRISES REACTING CELLULOSE WITH A MIXTURE COMPRISES REACTING CELLULOSE AND SULPHURIC ACID, THERE BEING PRESENT IN SAID MIXTURE FROM ABOUT ONE TO ABOUT THREE MOLES OF SULFATE RADICAL PER MOLE OF ALIPHATIC RADICAL, SAID ALIPHATIC SULFATE BEING DERIVED FROM A SULPHURIC ACID MISCIBLE ALIPHATIC ALCOHOL EXCEPTING ISOMERS THEREOF LABILE IN SULPHURIC ACID.
Claim 2
Dependent Claim
62 words
A PROCESS FOR THE PRODUCTION OF FIBROUS CELLULOSE SULFATE WHICH COMPRISES REACTING CELLULOSE WITH A MIXTURE COMPRISES REACTING CELLULOSE AND SULPHURIC ACID, THERE BEING PRESENT IN SAID MIXTURE FROM ABOUT ONE TO ABOUT THREE MOLES OF SULFATE RADICAL PER MOLE OF ALIPHATIC RADICAL, SAID ALIPHATIC SULFATE BEING DERIVED FROM A SULPHURIC ACID MISCIBLE ALIPHATIC ALCOHOL EXCEPTING ISOMERS THEREOF LABILE IN SULPHURIC ACID.
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) | 1954-07-09 | 1955-01-08 | 1955-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-09 | 1959-01-08 | 1959-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-09 | 1963-01-08 | 1963-07-10 | $7700.00 | Window Closed / Lapsed |