US2661349A
Expired / Lapsed
US
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Polysaccharide derivatives of substituted dicarboxylic acids
Assignee: NAT STARCH PRODUCTS Inc
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Filing: 1949-02-18
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Granted: 1953-12-01
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Expires: 1969-02-18
Abstract
No abstract record available.
Inventors
- 👤 Carlyle G Caldwell
- 👤 Otto B Wurzburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:45
CPC Classifications
C; C08; C08B; C08B3/00; C08B3/14; C08B3/12; C08B31/00; C08B31/02; C08B31/04; C08B37/00; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
A SUBSTITUTED POLYSACCHARIDE DERIVATIVE IN THE FORM OF A WATER-DISPERSIBLE MATERIAL, CHARACTERIZED BY EACH SUBSTITUENT RADICAL CONTAINING BOTH A HYDROPHILIC GROUP AND A HYDROPHOBIC GROUP, HAVING THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
29 words
A SUBSTITUTED POLYSACCHARIDE DERIVATIVE IN THE FORM OF A WATER-DISPERSIBLE MATERIAL, CHARACTERIZED BY EACH SUBSTITUENT RADICAL CONTAINING BOTH A HYDROPHILIC GROUP AND A HYDROPHOBIC GROUP, HAVING THE FOLLOWING FORMULA:
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) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |