US2497054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of cation active resins
Assignee: Wyeth Holdings LLC
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Filing: 1946-09-04
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Granted: 1950-02-07
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Expires: 1966-09-04
Abstract
No abstract record available.
Inventors
- 👤 Harold M Day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:30
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/28; B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A GRANULAR, WATER-INSOLUBLE SYNTHETIC RESINOUS MATERIAL HAVING A CAPACITY FOR EXCHANGING CATIONS IN LIQUID MEDIA AND OBTAINED BY A PROCESS WHICH COMPRISES BRINGING ABOUT REACTION BETWEEN 4,4''-DIHYDROXYDIPHENYL SULFONE, FORMALDEHYDE AND AN ALKALINE SULFITING AGENT BY HEATING, UNTIL FORMATION OF A VISCOUS SYRUP OCCURS, CURING THE SYRUP BY HEATING AT ABOUT 125*-150*C., AND GRANULATING THE CURED MATERIAL TO A PARTICLE SIZE OF FROM 8 TO 60 MESH, RELATIVE MOLAR PROPORTIONS OF FORMALDEHYDE TO 4.4''-DIHYDROXYDIPHENYL SULFONE BEING FROM 4:1 TO 10:1 AND OF 4,4''-DIHYDROXYDIPHENYL SULFONE TO SULFITING AGENT BEING 1:1.
Claim 2
Dependent Claim
88 words
A GRANULAR, WATER-INSOLUBLE SYNTHETIC RESINOUS MATERIAL HAVING A CAPACITY FOR EXCHANGING CATIONS IN LIQUID MEDIA AND OBTAINED BY A PROCESS WHICH COMPRISES BRINGING ABOUT REACTION BETWEEN 4,4''-DIHYDROXYDIPHENYL SULFONE, FORMALDEHYDE AND AN ALKALINE SULFITING AGENT BY HEATING, UNTIL FORMATION OF A VISCOUS SYRUP OCCURS, CURING THE SYRUP BY HEATING AT ABOUT 125*-150*C., AND GRANULATING THE CURED MATERIAL TO A PARTICLE SIZE OF FROM 8 TO 60 MESH, RELATIVE MOLAR PROPORTIONS OF FORMALDEHYDE TO 4.4''-DIHYDROXYDIPHENYL SULFONE BEING FROM 4:1 TO 10:1 AND OF 4,4''-DIHYDROXYDIPHENYL SULFONE TO SULFITING AGENT BEING 1:1.
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) | 1953-02-06 | 1953-08-08 | 1954-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-06 | 1957-08-08 | 1958-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-06 | 1961-08-08 | 1962-02-07 | $7700.00 | Window Closed / Lapsed |