US2720464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing cold-water-soluble powdered cellulose ethers
Assignee: Dow Chemical Co
•
Filing: 1952-10-24
•
Granted: 1955-10-11
•
Expires: 1972-10-24
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Anderson
- 👤 Bernhard V Moeller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:19
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A METHOD OF TREATING A FIBROUS COLD-WATER-SOLUBLE CELLULOSE ETHER, WHICH NORMALLY GELS IN HOT WATER, TO IMPROVE ITS RATE OF SOLUTION IN COLD WATER WHICH COMPRISES COMPLETELY WETTING THE FIBROUS CELLULOSE ETHER WITHOUT DISSOLVING IT, AT A TEMPERATURE ABOVE THE GEL FORMATION TEMPERATURE OF SAID ETHER, WITHAN AQUEOUS SOLUTION OF FROM 0.01 TO 1 PER CENT BY WEIGHT OF SODIUM LAURYL SULFATE, AND DRYING THE WET ETHER, CONTAINING AN AMOUNT OF THE TREATING SOLUTION WHICH HOLDS FROM 0.01 TO 1 PER CENT OF THE SURFACE ACTIVE AGENT, BASED ON THE WEIGHT OF CELLULOSE ETHER, AT A TEMPERATURE ABOVE THE GEL FORMATION TEMPERATURE OF SAID ETHER.
Claim 2
Independent Claim
105 words
A METHOD OF TREATING A FIBROUS COLD-WATER-SOLUBLE CELLULOSE ETHER, WHICH NORMALLY GELS IN HOT WATER, TO IMPROVE ITS RATE OF SOLUTION IN COLD WATER WHICH COMPRISES COMPLETELY WETTING THE FIBROUS CELLULOSE ETHER WITHOUT DISSOLVING IT, AT A TEMPERATURE ABOVE THE GEL FORMATION TEMPERATURE OF SAID ETHER, WITHAN AQUEOUS SOLUTION OF FROM 0.01 TO 1 PER CENT BY WEIGHT OF SODIUM LAURYL SULFATE, AND DRYING THE WET ETHER, CONTAINING AN AMOUNT OF THE TREATING SOLUTION WHICH HOLDS FROM 0.01 TO 1 PER CENT OF THE SURFACE ACTIVE AGENT, BASED ON THE WEIGHT OF CELLULOSE ETHER, AT A TEMPERATURE ABOVE THE GEL FORMATION TEMPERATURE OF SAID ETHER.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |