US3033853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of hydroxyalkyl starches
Assignee: Hercules Powder Co
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Filing: 1959-04-15
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Granted: 1962-05-08
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Expires: 1979-04-15
Abstract
No abstract record available.
Inventors
- 👤 Eugene D Klug
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:50
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/08; C08B31/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
THE PROCESS OF PREPARING HYDROXYALKYL ETHERS OF STARCH WHICH COMPRISES REACTING STARCH WITH AN ALKYLENE OXIDE IN THE PRESENCE OF WATER AND AN ALKALI CATALYST, AND RECOVERING THE RESULTING STARCH ETHER PRODUCT, THE WEIGHT RATIO OF WATER/STARCH, ALKALI/STARCH AND ALKYLENE OXIDE/ STARCH BEING 4.4/1-6,4/1, 0.017/1-0.025/1 AND 0.10/1 TO 0.75/1 RESPECTIVELY.
Claim 2
Dependent Claim
50 words
THE PROCESS OF PREPARING HYDROXYALKYL ETHERS OF STARCH WHICH COMPRISES REACTING STARCH WITH AN ALKYLENE OXIDE IN THE PRESENCE OF WATER AND AN ALKALI CATALYST, AND RECOVERING THE RESULTING STARCH ETHER PRODUCT, THE WEIGHT RATIO OF WATER/STARCH, ALKALI/STARCH AND ALKYLENE OXIDE/ STARCH BEING 4.4/1-6,4/1, 0.017/1-0.025/1 AND 0.10/1 TO 0.75/1 RESPECTIVELY.
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) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |