US3287353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersants used in the preparation of hydroxyethyl cellulose
Assignee: Hercules LLC
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Filing: 1964-04-23
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Granted: 1966-11-22
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Expires: 1984-04-23
Abstract
No abstract record available.
Inventors
- 👤 Joseph P Stidham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:04
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
PROCESS OF PREPARING HYDROXYETHYL CELLULOSE COMPRISING AGITATING CELLULOSIC MATERIAL IN PARTICULATE FORM IN A MIXTURE OF ALKALI, WATER, A HYDROXYETHYLATING AGENT AND A LIQUID DISPERSANT CONSISTING ESSENTIALLY OF ISOPROPYL ALCOHOL AND TERTIARY BUTYL ALCOHOL IN ADMIXTURE, AND OBTAINING THE HYDROXYETHYL CELLULOSE THUS PRODUCED IN SUBSTANTIALLY THE SAME PARTICULATE FORM AS THE STARTING CELLULOSIC MATERIAL, THE ISOPROPYL ALCOHOL-TERTIARY BUTYL ALCOHOL MIXTURE CONSISTING OF ABOUT 2%-25% BY WEIGHT THEREOF OF ISOPROYL ALCOHOL.
Claim 2
Dependent Claim
70 words
PROCESS OF PREPARING HYDROXYETHYL CELLULOSE COMPRISING AGITATING CELLULOSIC MATERIAL IN PARTICULATE FORM IN A MIXTURE OF ALKALI, WATER, A HYDROXYETHYLATING AGENT AND A LIQUID DISPERSANT CONSISTING ESSENTIALLY OF ISOPROPYL ALCOHOL AND TERTIARY BUTYL ALCOHOL IN ADMIXTURE, AND OBTAINING THE HYDROXYETHYL CELLULOSE THUS PRODUCED IN SUBSTANTIALLY THE SAME PARTICULATE FORM AS THE STARTING CELLULOSIC MATERIAL, THE ISOPROPYL ALCOHOL-TERTIARY BUTYL ALCOHOL MIXTURE CONSISTING OF ABOUT 2%-25% BY WEIGHT THEREOF OF ISOPROYL ALCOHOL.
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) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |