US2657201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled, heterogeneous hydrolysis of polymeric esters
Assignee: EIDP Inc
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Filing: 1949-11-25
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Granted: 1953-10-27
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Expires: 1969-11-25
Abstract
No abstract record available.
Inventors
- 👤 Nebel Richard Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:13
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A PROCESS FOR THE PRODUCTION OF A LOW VISCOSITY, PARTIAL HYDROLYSIS PRODUCT OF A WATER-INSOLUBLE CARBOXYLIC ACID ESTER OF POLYVINYL ALCOHOL, SAID PARTIAL HYDROLYSIS BEING NO MORE THAN ABOUT 90% OF THEORETICAL, WHCIH COMPRISES HEATING AND STIRRING UNTIL EQUILIBRIUM IS ESTABLISHED, A HETEROGENEOUS AQUEOUS DISPERSION CONTAINING BOUT 23.2% TO ABOUT 25.7% OF SAID ESTERAINING AND A LOWER ALKYL CARBOXYLIC ACID CONTAINING NO MORE THAN 9 CARBON ATOMS, WHICH CONSTITUTES, AT THE LOWER CONCENTRATION OF ESTER, AT LEAST ABOUT 20% OF THE AQUEOUS DISPERSION, AND AT THE HIGHER CONCENTRATION OF ESTER, AT LEAST ABOUT 12.4% OF THE AQUEOUS DISPERSION AND FROM ABOUT 0.1% TO ABOUT 2.0% OF A CATALYST FROM THE GROUP CONSISTING OF SULFONIC, PHOSPHINIC AND PHOSPHONIC ACIDS CONTAINING AT LEAST 5 CARBON ATOMS, AND THE MONO- AND DIALKYL ORTHOPHOSPHORIC ACID ESTERS,
Claim 2
Dependent Claim
132 words
A PROCESS FOR THE PRODUCTION OF A LOW VISCOSITY, PARTIAL HYDROLYSIS PRODUCT OF A WATER-INSOLUBLE CARBOXYLIC ACID ESTER OF POLYVINYL ALCOHOL, SAID PARTIAL HYDROLYSIS BEING NO MORE THAN ABOUT 90% OF THEORETICAL, WHCIH COMPRISES HEATING AND STIRRING UNTIL EQUILIBRIUM IS ESTABLISHED, A HETEROGENEOUS AQUEOUS DISPERSION CONTAINING BOUT 23.2% TO ABOUT 25.7% OF SAID ESTERAINING AND A LOWER ALKYL CARBOXYLIC ACID CONTAINING NO MORE THAN 9 CARBON ATOMS, WHICH CONSTITUTES, AT THE LOWER CONCENTRATION OF ESTER, AT LEAST ABOUT 20% OF THE AQUEOUS DISPERSION, AND AT THE HIGHER CONCENTRATION OF ESTER, AT LEAST ABOUT 12.4% OF THE AQUEOUS DISPERSION AND FROM ABOUT 0.1% TO ABOUT 2.0% OF A CATALYST FROM THE GROUP CONSISTING OF SULFONIC, PHOSPHINIC AND PHOSPHONIC ACIDS CONTAINING AT LEAST 5 CARBON ATOMS, AND THE MONO- AND DIALKYL ORTHOPHOSPHORIC ACID ESTERS,
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) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |