US2522569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of cation active resins
Assignee: Wyeth Holdings LLC
•
Filing: 1946-06-11
•
Granted: 1950-09-19
•
Expires: 1966-06-11
Abstract
No abstract record available.
Inventors
- 👤 Harold M Day
- 👤 Hoff Ronald L De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:02
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
95 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, AS SOLE REACTANTS, 4,4''-DIPHENYLOL DIMETHYL METHANE, FORMALDEHYDE AND AN ALKALINE SULFITING AGENT IN MOLAR PROPORTIONS OF FROM 4:1 TO 10:1, FORMALDEHYDE TO 4,4''-DIPHENYLOL DIMETHYL METHANE, AND FROM 1.5:1 TO 1:0.5, 4,4''-DIPHENYLOL DIMETHYL METHANE TO SULFITING AGENT, HEAT, HEATING THE REACTION PRODUCT OBTAINED UNTIL FORMATION OF A VISCOUS SYRUP OCCURS, CURING THE SYRUP BY HEATING, AND GRANULATING THE CURRED MATERIAL TO A PARTICLE SIZE OF FROM 8 TO 60 MESH.
Claim 2
Dependent Claim
95 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, AS SOLE REACTANTS, 4,4''-DIPHENYLOL DIMETHYL METHANE, FORMALDEHYDE AND AN ALKALINE SULFITING AGENT IN MOLAR PROPORTIONS OF FROM 4:1 TO 10:1, FORMALDEHYDE TO 4,4''-DIPHENYLOL DIMETHYL METHANE, AND FROM 1.5:1 TO 1:0.5, 4,4''-DIPHENYLOL DIMETHYL METHANE TO SULFITING AGENT, HEAT, HEATING THE REACTION PRODUCT OBTAINED UNTIL FORMATION OF A VISCOUS SYRUP OCCURS, CURING THE SYRUP BY HEATING, AND GRANULATING THE CURRED MATERIAL TO A PARTICLE SIZE OF FROM 8 TO 60 MESH.
References Cited (Backward Citations)
FR823808A
Cited
US1225749A
Cited
US2357798A
Cited
US2373549A
Cited
US2373548A
Cited
US2373547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-18 | 1954-03-20 | 1954-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-18 | 1958-03-20 | 1958-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-18 | 1962-03-20 | 1962-09-19 | $7700.00 | Window Closed / Lapsed |