Patent US2093087A successfully refreshed from Google Patents.
US3041318A
Expired / Lapsed
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Process for recovering water soluble polymers
Assignee: Wyeth Holdings LLC
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Filing: 1957-10-01
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Granted: 1962-06-26
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Expires: 1977-10-01
Abstract
No abstract record available.
Inventors
- 👤 Irwin H Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:49
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/14; C08J3/02; C08J3/09; C08J2300/00; C08J2300/14; C08J2357/00; C08J2357/06; Y; Y10; Y10S; Y10S260/00; Y10S260/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A PROCESS FOR REMOVING A WATER-SOLUTION POLYMER OF A POLYMERIZABLE COMPOUND CONTAINING A CH2=C* GROUP FROM AN AQUEOUS DISPERSION THEROF COMPRISING EMULSIFYING SAID AQUEOUS DISPERSION IN THE PRESENCE OF A WATER IMMISCIBLE ORGANIC MATERIAL TO FORM A WATER-IN-OIL EMULSION OF SAID AQUEOUS DISPERSION, WHEREIN THE OIL PHASE IS A LIQUID, WATER-IMMISICBLE, ORGANIC MATERIAL WHICH SAID POLYMER IS INSOLUBLE, BLENDING SAID EMULSION THOROUGHLY WITH A LIQUID ORGANIC PRECIPTATING AGENT IN AN AMOUNT SUFFICIENT TO PRECIPITATE THE POLYMER FROM THE RESIDUAL, SEPARATING THE SOLID PRECIPITATED POLYMER FROM THE RESIDUAL FLUID AND DRYING THE SEPARATED POLYMER, WHEREIN SAID PRETO SAID POLYMER AND IN WHICH SAID POLYMER IS SUNSTANTIALLY INSOLUBLE, WHEREIN AN AQUEOUS SOLUTION OF SAID PRECIPITTATING AGENT IS A NON-SOLVENT FOR SAID POLYMER AT A CONCENTRATION UP TO AND INCLUDING SATURATION AND WHEREIN SAID WATER IMMISCIBLE ORGANIC MATERIAL IS CHARACTERIZED AS ONE IN WHICH SAID POLYMER.
Claim 2
Dependent Claim
143 words
A PROCESS FOR REMOVING A WATER-SOLUTION POLYMER OF A POLYMERIZABLE COMPOUND CONTAINING A CH2=C* GROUP FROM AN AQUEOUS DISPERSION THEROF COMPRISING EMULSIFYING SAID AQUEOUS DISPERSION IN THE PRESENCE OF A WATER IMMISCIBLE ORGANIC MATERIAL TO FORM A WATER-IN-OIL EMULSION OF SAID AQUEOUS DISPERSION, WHEREIN THE OIL PHASE IS A LIQUID, WATER-IMMISICBLE, ORGANIC MATERIAL WHICH SAID POLYMER IS INSOLUBLE, BLENDING SAID EMULSION THOROUGHLY WITH A LIQUID ORGANIC PRECIPTATING AGENT IN AN AMOUNT SUFFICIENT TO PRECIPITATE THE POLYMER FROM THE RESIDUAL, SEPARATING THE SOLID PRECIPITATED POLYMER FROM THE RESIDUAL FLUID AND DRYING THE SEPARATED POLYMER, WHEREIN SAID PRETO SAID POLYMER AND IN WHICH SAID POLYMER IS SUNSTANTIALLY INSOLUBLE, WHEREIN AN AQUEOUS SOLUTION OF SAID PRECIPITTATING AGENT IS A NON-SOLVENT FOR SAID POLYMER AT A CONCENTRATION UP TO AND INCLUDING SATURATION AND WHEREIN SAID WATER IMMISCIBLE ORGANIC MATERIAL IS CHARACTERIZED AS ONE IN WHICH SAID POLYMER.
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) | 1965-06-25 | 1965-12-25 | 1966-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-25 | 1969-12-25 | 1970-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-25 | 1973-12-25 | 1974-06-26 | $7700.00 | Window Closed / Lapsed |