Patent US2809943A successfully refreshed from Google Patents.
US2809943A
Expired / Lapsed
US
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Weighted ion exchange resin granules and method of making same
Assignee: Dow Chemical Co
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Filing: 1952-09-11
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Granted: 1957-10-15
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Expires: 1972-09-11
Abstract
No abstract record available.
Inventors
- 👤 David J Pye
- 👤 West Theo John
- 👤 Paul M Craven
- 👤 James A Patterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:58
CPC Classifications
B; B01; B01J; B01J2/00; B01J39/00; B01J39/08; B01J39/16; B01J39/17; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
ROUNDED GRANULES OF: (1) AN ION EXCHANGE RESIN WHICH IS A DERIVATIVE OF A COPOLYMER, OF A MAJOR PROPORTION BY WEIGHT OF AT LEAST ONE ALKENYL AROMATIC HYDROCARBON HAVING AN ALKENYL RADICAL SELECTED FROM THE GROUP CONSISTING OF VINYL AND ISOPROPENYL RADICALS ATTACHED TO A CARBON ATOM OF THE AROMATIC NUCLEUS AND A MINOR AMOUNT OF DIVINYLBENZENE, HAVING ION EXCHANGE RADICALS PRESENT AS SUBSTITUENTS ON THE COPOLYMER MOLECULE, AND (2) A FINELY DIVIDED SOLID MATERIAL HAVING A DENSITY OF AT LEAST 2.5, WHICH MATERIAL IS INCOMPATIBLE WITH THE SOLID POLYMERIC MATERIAL AND IS EMBEDDED TO THE LATTER IN A PROPORTION LARGER THAN 5 PERCENT OF THE COMBINED ABSOLUTE VOLUME OF THE SAME AND SAID POLYMERIC MATERIAL AND SUCH THAT THE GRANULES HAVE A DENSITY GREATER THAN THAT OF THE POLYMERIC MATERIAL ALONE.
Claim 2
Dependent Claim
132 words
ROUNDED GRANULES OF: (1) AN ION EXCHANGE RESIN WHICH IS A DERIVATIVE OF A COPOLYMER, OF A MAJOR PROPORTION BY WEIGHT OF AT LEAST ONE ALKENYL AROMATIC HYDROCARBON HAVING AN ALKENYL RADICAL SELECTED FROM THE GROUP CONSISTING OF VINYL AND ISOPROPENYL RADICALS ATTACHED TO A CARBON ATOM OF THE AROMATIC NUCLEUS AND A MINOR AMOUNT OF DIVINYLBENZENE, HAVING ION EXCHANGE RADICALS PRESENT AS SUBSTITUENTS ON THE COPOLYMER MOLECULE, AND (2) A FINELY DIVIDED SOLID MATERIAL HAVING A DENSITY OF AT LEAST 2.5, WHICH MATERIAL IS INCOMPATIBLE WITH THE SOLID POLYMERIC MATERIAL AND IS EMBEDDED TO THE LATTER IN A PROPORTION LARGER THAN 5 PERCENT OF THE COMBINED ABSOLUTE VOLUME OF THE SAME AND SAID POLYMERIC MATERIAL AND SUCH THAT THE GRANULES HAVE A DENSITY GREATER THAN THAT OF THE POLYMERIC MATERIAL ALONE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |