US2808380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous compositions containing polyvinyl alcohol and substituted starch, the substituent being a salt of a carboxyl radical
Assignee: NAT STARCH PRODUCTS Inc
•
Filing: 1953-02-27
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Granted: 1957-10-01
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Expires: 1973-02-27
Abstract
No abstract record available.
Inventors
- 👤 Herbert C Olsen
- 👤 Richard A Weidener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:58
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/327; D06M15/333; D06M15/01; D06M15/03; D06M15/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A STABLE, AQUEOUS, STARCH-PROLYVINYL ALCOHOL COMPOSITION COMPRISING A MIXTURE OF WATER, PLYVINYL ALCOHOL AND A SUBSTITUTED ATARCH PRODUCT SELECTED FROM THE CLASS CONSISTING OF WATER DISPERSIBLE STARCH ETHERS AND STARCH ESTERS, THE SAID STARCH ESTERS RESULTING FROM THE REACTION OF STARCH WITH ANHYDRIDES OF ORGANIC CYCLIC DI-BASIC ACIDS SELECTED FROM THE CALSS CONSISTING OF MALEIC, SUCCINIC, PHTHALIC, GLUTARIC AND CITRACONIC ANHYDRIDES, SAID SUBSTITUTED STARCH PRODUCT CONTAINING WITHIN ITS SUBSTITUENT GROUPS A SALT OF A CARBODYL RADICAL SELECTED FROM THE CLASS CONSISTING OF AMMONIUM, SODIUM AND POTASSIUM SALTS.
Claim 2
Dependent Claim
87 words
A STABLE, AQUEOUS, STARCH-PROLYVINYL ALCOHOL COMPOSITION COMPRISING A MIXTURE OF WATER, PLYVINYL ALCOHOL AND A SUBSTITUTED ATARCH PRODUCT SELECTED FROM THE CLASS CONSISTING OF WATER DISPERSIBLE STARCH ETHERS AND STARCH ESTERS, THE SAID STARCH ESTERS RESULTING FROM THE REACTION OF STARCH WITH ANHYDRIDES OF ORGANIC CYCLIC DI-BASIC ACIDS SELECTED FROM THE CALSS CONSISTING OF MALEIC, SUCCINIC, PHTHALIC, GLUTARIC AND CITRACONIC ANHYDRIDES, SAID SUBSTITUTED STARCH PRODUCT CONTAINING WITHIN ITS SUBSTITUENT GROUPS A SALT OF A CARBODYL RADICAL SELECTED FROM THE CLASS CONSISTING OF AMMONIUM, SODIUM AND POTASSIUM SALTS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |