US2844571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of highly hydroxyalkylated polyvinyl alcohols
Assignee: Union Carbide Corp
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Filing: 1956-05-09
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Granted: 1958-07-22
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Expires: 1976-05-09
Abstract
No abstract record available.
Inventors
- 👤 Aubrey E Broderick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:23
CPC Classifications
C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
AS NEW PRODUCTS, HYDROXYALKYL ETHERS OF POLYVINYL ALCOHOLS SELECTED FROM THE CLASS CONSISTING OF THE HYDROXYETHYL AND HYDROXYPROPYL ETHERS OF POLYVINYL ALCOHOLS, WHICH ETHERS CONTAIN AT LEAST ABOUT 4.5 PARTS BY WEIGHT OF HYDROXYALKYL RESIDUES PER PART BY WEIGHT OF POLYVINYL ALCOHOL RESIDUES AND ARE SOLUBLE IN ACETONITRILE AND IN DIOXANE.
Claim 2
Dependent Claim
51 words
AS NEW PRODUCTS, HYDROXYALKYL ETHERS OF POLYVINYL ALCOHOLS SELECTED FROM THE CLASS CONSISTING OF THE HYDROXYETHYL AND HYDROXYPROPYL ETHERS OF POLYVINYL ALCOHOLS, WHICH ETHERS CONTAIN AT LEAST ABOUT 4.5 PARTS BY WEIGHT OF HYDROXYALKYL RESIDUES PER PART BY WEIGHT OF POLYVINYL ALCOHOL RESIDUES AND ARE SOLUBLE IN ACETONITRILE AND IN DIOXANE.
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) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |