US2847407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molecular weight fractionation of polyvinylpyrrolidone
Assignee: GAF Chemicals Corp
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Filing: 1956-04-27
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Granted: 1958-08-12
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Expires: 1976-04-27
Abstract
No abstract record available.
Inventors
- 👤 William A Hosmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:52
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
APPARATUS FOR SEPARATING POLYVINYLPYRROLIDONE INTO FRACTIONS OF RELATIVELY NARROW MOLECULAR WEIGHT RANGE COMPRISING A CONTAINER HAVING A STIRRER THEREIN, A HEATING JACKET THERE AROUND, INLET AND OUTLET PORTS, MEANS FOR THE DELIVERY OF POLYVINYLPYRROLIDONE AND SOLVENT THERETO TOGETHER WITH MEANS FOR SEPARATING STRAIFIGIED FLUID LAYERS THEREEIN; A SECOND CONTAINER HAVING A REFRIGERATING JACKET THERE AROUND TOGETHER WITH INLET, OUTLET AND DRAIN PORTS; THE SAID INLET PORTS BEING CONNECTED TO THE SAID FIRST CONTAINER TOGETHER WITH A SECOND STRATIFICATION SEPARATING MEANS IN SAID SECOND CONTAINER; A THIRD CONTAINER HAVING A HEATING JACKET THERE AROUND FOR VOLATILIZING SOLVENT THEREIN; THE THIRD CONTAINER BEING CONNECTED TO THE STRATIFICATION SEPARATING MEANS IN THE SECOND CONTAINER.
Claim 2
Dependent Claim
111 words
APPARATUS FOR SEPARATING POLYVINYLPYRROLIDONE INTO FRACTIONS OF RELATIVELY NARROW MOLECULAR WEIGHT RANGE COMPRISING A CONTAINER HAVING A STIRRER THEREIN, A HEATING JACKET THERE AROUND, INLET AND OUTLET PORTS, MEANS FOR THE DELIVERY OF POLYVINYLPYRROLIDONE AND SOLVENT THERETO TOGETHER WITH MEANS FOR SEPARATING STRAIFIGIED FLUID LAYERS THEREEIN; A SECOND CONTAINER HAVING A REFRIGERATING JACKET THERE AROUND TOGETHER WITH INLET, OUTLET AND DRAIN PORTS; THE SAID INLET PORTS BEING CONNECTED TO THE SAID FIRST CONTAINER TOGETHER WITH A SECOND STRATIFICATION SEPARATING MEANS IN SAID SECOND CONTAINER; A THIRD CONTAINER HAVING A HEATING JACKET THERE AROUND FOR VOLATILIZING SOLVENT THEREIN; THE THIRD CONTAINER BEING CONNECTED TO THE STRATIFICATION SEPARATING MEANS IN THE SECOND CONTAINER.
References Cited (Backward Citations)
GB613519A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-11 | 1962-02-10 | 1962-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-11 | 1966-02-10 | 1966-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-11 | 1970-02-10 | 1970-08-12 | $7700.00 | Window Closed / Lapsed |