Patent US6464649B1 successfully refreshed from Google Patents.
Patent US4301188A successfully refreshed from Google Patents.
US2572039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of cellulose ethers
Assignee: Hercules Powder Co
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Filing: 1949-11-04
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Granted: 1951-10-23
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Expires: 1969-11-04
Abstract
No abstract record available.
Inventors
- 👤 Eugene D Klug
- 👤 Howard G Tennent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:43
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
IN THE MANUFACTURE OF ETHER OF CELLULOSE, THE IMPROVEMENT WHICH COMPRISES MIXING CELLULOSIC MATERIAL IN PARTICULATE FORM WITH AN ALCOHOL OF THE GROUP CONSISTING OF THE SECONDARY 3-CARBON AND SECONDARY AND TERTIARY 4-, AND 5-CARBON ALIPHATIC ALCOHOLS AND MIXTURE THEREOF IN THE PRESENCE OF ALKALI AND WATER, EMPLOYING AT LEAST ABOUT 2 PARTS BY WEIGHT OF SAID ALCOHOL FOR EACH PART BY WEIGHT OF WATER WHICH IS PRESENT, REACTING SAID CELLULOSIC MATERIAL IN PARTICULATE FORM AND IN THE PRESENCE OF THE ALKALI, THE WATER AND THE ALCOHOL WITH A HYDROXYALKYLATING AGENT, AND OBTAINING THE HYDROXYALKYL CELLULOSE ETHER THUS PRODUCED IN SUBSTANTIALLY THE SAME PARTICLUATE FORM AS THE STARTING CELLULOSIC MATERIAL.
Claim 2
Dependent Claim
110 words
IN THE MANUFACTURE OF ETHER OF CELLULOSE, THE IMPROVEMENT WHICH COMPRISES MIXING CELLULOSIC MATERIAL IN PARTICULATE FORM WITH AN ALCOHOL OF THE GROUP CONSISTING OF THE SECONDARY 3-CARBON AND SECONDARY AND TERTIARY 4-, AND 5-CARBON ALIPHATIC ALCOHOLS AND MIXTURE THEREOF IN THE PRESENCE OF ALKALI AND WATER, EMPLOYING AT LEAST ABOUT 2 PARTS BY WEIGHT OF SAID ALCOHOL FOR EACH PART BY WEIGHT OF WATER WHICH IS PRESENT, REACTING SAID CELLULOSIC MATERIAL IN PARTICULATE FORM AND IN THE PRESENCE OF THE ALKALI, THE WATER AND THE ALCOHOL WITH A HYDROXYALKYLATING AGENT, AND OBTAINING THE HYDROXYALKYL CELLULOSE ETHER THUS PRODUCED IN SUBSTANTIALLY THE SAME PARTICLUATE FORM AS THE STARTING CELLULOSIC MATERIAL.
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) | 1954-10-22 | 1955-04-23 | 1955-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-22 | 1959-04-23 | 1959-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-22 | 1963-04-23 | 1963-10-23 | $7700.00 | Window Closed / Lapsed |