US2828270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange resins derived from vinyl pyridine, polyvinyl benzene and styrene compounds
Assignee: ChampionX LLC
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Filing: 1953-08-04
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Granted: 1958-03-25
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Expires: 1973-08-04
Abstract
No abstract record available.
Inventors
- 👤 Murata Yoshiaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:34
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/08; C08F8/00; C08F8/02; C08F8/44; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A WATER-INSOLUBLE RESINOUS COMPOSITION FROM THE GROUP CONSISTING OF THE LOWER ALKYL QUATERNARY AMMONIUM SALTS AND HYDROXIDES OF A COPOLYMER OF FROM 19 TO 66 MOLAR PERCENT OF VINYL PYRIDINE, FROM 1.3 TO 12 MOLAR PERCENT OF POLYVINYLBENZENE AND FROM 30 TO 78 MOLAR PERCENT OF A COMPOUND FROM THE GROUP CONSISTING OF STYRENE, DICHLOROSTYRENE AND ALPHA-METHYLSTYRENE.
Claim 2
Dependent Claim
57 words
A WATER-INSOLUBLE RESINOUS COMPOSITION FROM THE GROUP CONSISTING OF THE LOWER ALKYL QUATERNARY AMMONIUM SALTS AND HYDROXIDES OF A COPOLYMER OF FROM 19 TO 66 MOLAR PERCENT OF VINYL PYRIDINE, FROM 1.3 TO 12 MOLAR PERCENT OF POLYVINYLBENZENE AND FROM 30 TO 78 MOLAR PERCENT OF A COMPOUND FROM THE GROUP CONSISTING OF STYRENE, DICHLOROSTYRENE AND ALPHA-METHYLSTYRENE.
References Cited (Backward Citations)
US2540984A
Cited
US2540985A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |