Patent US5254090A successfully refreshed from Google Patents.
US2879268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of improving the dissolution of high-molecular substances
Assignee: Mo och Domsjo AB
•
Filing: 1954-12-28
•
Granted: 1959-03-24
•
Expires: 1974-12-28
Abstract
No abstract record available.
Inventors
- 👤 Jullander Elof Ingvar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:36
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/20; Y; Y10; Y10S; Y10S424/00; Y10S424/07; Y10S8/00; Y10S8/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A METHOD OF TREATING A CELLULOSE DERIVATIVE SELECTED FROM THE CLASS CONSISTING OF CELLULOSE ESTERS AND ETHERS SOLUBLE IN WATER AND CELLULOSE ESTERS AND ETHERS SOLUBLE IN AQUEOUS ALKALI, WHICH COMPRISES REACTING SAID CELLULOSE DERIVATIVE IN SOLID FORM WITH AN ALDEHYDE SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE AND GLYOXAL IN AN AMOUNT WHICH IS WITHIN THE RANGE OF FROM ABOUT 0.005% TO ABOUT 5% BASED ON THE WEIGHT OF SAID CELLULOSE DERIVATIVE AND WHICH IS INSUFFICIENT TO SUBSTANTIALLY IMPAIR THE SOLUBILITY OF SAID CELLULOSE DERIVATIVE BUT SUFFICIENT TO SUBSTANTIALLY REDUCE THE AGGLOMERATION OF SAID CELLULOSE DERIVATIVE WHEN IT IS SUBSEQUENTLY DISSOLVED IN SAID SOLVENT.
Claim 2
Independent Claim
105 words
A METHOD OF TREATING A CELLULOSE DERIVATIVE SELECTED FROM THE CLASS CONSISTING OF CELLULOSE ESTERS AND ETHERS SOLUBLE IN WATER AND CELLULOSE ESTERS AND ETHERS SOLUBLE IN AQUEOUS ALKALI, WHICH COMPRISES REACTING SAID CELLULOSE DERIVATIVE IN SOLID FORM WITH AN ALDEHYDE SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE AND GLYOXAL IN AN AMOUNT WHICH IS WITHIN THE RANGE OF FROM ABOUT 0.005% TO ABOUT 5% BASED ON THE WEIGHT OF SAID CELLULOSE DERIVATIVE AND WHICH IS INSUFFICIENT TO SUBSTANTIALLY IMPAIR THE SOLUBILITY OF SAID CELLULOSE DERIVATIVE BUT SUFFICIENT TO SUBSTANTIALLY REDUCE THE AGGLOMERATION OF SAID CELLULOSE DERIVATIVE WHEN IT IS SUBSEQUENTLY DISSOLVED IN SAID SOLVENT.
References Cited (Backward Citations)
US2148952A
Cited
US2285490A
Cited
US2399456A
Cited
US2635972A
Cited
US2636804A
Cited
US2684914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |