US3131177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of water-soluble hydroxyalkyl cellulose ethers
Assignee: Hercules Powder Co
•
Filing: 1960-04-13
•
Granted: 1964-04-28
•
Expires: 1980-04-13
Abstract
No abstract record available.
Inventors
- 👤 Eugene D Klug
- 👤 William D Roberson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:08
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
PROCESS OF PREPARING WATER-SOLUBLE HYDROXYALKYL CELLULOSE ETHERS IN THE PRESENCE OF A SUBSTANTIALLY WATER MISCIBLE KETONE COMPRISING HYDROXYALKYLATING CELLULOSE TO AN MS NOT EXCEEDING 1.0 IN THE PRESENCE OF AN ALKALI AND WATER, THE ALKALI/CELLULOSE AND WATER/CELLULOSE RATIOS BEING 0.2/1-0.8/1 AND 0.8/1-4.0/1, RESPECTIVELY, NEUTRALIZING 70%-98% OF THE ALKALI, CONTINUING THE HYDROXYALKYLATION IN THE PRESENCE OF THE REMAINING ALKALI AND THE RESULTING NEUTRALIZATION PRODUCT TO AN MS OF ABOUT 1.53.0 EMPLOYING A WATER/HYDROXYALKYL CELLULOSE RATIO OF 1/1-20/1.
Claim 2
Dependent Claim
76 words
PROCESS OF PREPARING WATER-SOLUBLE HYDROXYALKYL CELLULOSE ETHERS IN THE PRESENCE OF A SUBSTANTIALLY WATER MISCIBLE KETONE COMPRISING HYDROXYALKYLATING CELLULOSE TO AN MS NOT EXCEEDING 1.0 IN THE PRESENCE OF AN ALKALI AND WATER, THE ALKALI/CELLULOSE AND WATER/CELLULOSE RATIOS BEING 0.2/1-0.8/1 AND 0.8/1-4.0/1, RESPECTIVELY, NEUTRALIZING 70%-98% OF THE ALKALI, CONTINUING THE HYDROXYALKYLATION IN THE PRESENCE OF THE REMAINING ALKALI AND THE RESULTING NEUTRALIZATION PRODUCT TO AN MS OF ABOUT 1.53.0 EMPLOYING A WATER/HYDROXYALKYL CELLULOSE RATIO OF 1/1-20/1.
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) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |