Patent US2992544A successfully refreshed from Google Patents.
US2992544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insoluble resinous copolymers of (chloromethyl) styrene and polyvinyl aromatic hydrocarbons and nitrogen-containing derivatives of the copolymers
Assignee: Dow Chemical Co
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Filing: 1955-05-09
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Granted: 1961-07-18
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Expires: 1975-05-09
Abstract
No abstract record available.
Inventors
- 👤 Elmer L Mcmaster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:17
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A RESINOUS COMPOSITION IN THE FORM OF DISCRETE PARTICLES AND SUITABLE FOR THE REMOVAL OF ANIONS FROM FLUIDS, WHICH COMPRISES THE REACTION PRODUCT OF A COPOLYMER PREPARED BY POLYMERIZING A MIXTURE OF FROM 75 TO 90 PERCENT OF AR-(CHLOROMETHYL)STYRENE AND FROM 25 TO 10 PERCENT OF DIVINYLBENZENE, ON A MOLAR BASIS, SAID COPOLYMER BEING IN THE FORM OF DISCRETE PARTICLES, AND A TERTIARY AMINE SELECTED FROM THE GROUP CONSISTING OF TRIMETHYLAMINE AND DIMETHYLETHYLETHANOLAMINE.
Claim 2
Dependent Claim
73 words
A RESINOUS COMPOSITION IN THE FORM OF DISCRETE PARTICLES AND SUITABLE FOR THE REMOVAL OF ANIONS FROM FLUIDS, WHICH COMPRISES THE REACTION PRODUCT OF A COPOLYMER PREPARED BY POLYMERIZING A MIXTURE OF FROM 75 TO 90 PERCENT OF AR-(CHLOROMETHYL)STYRENE AND FROM 25 TO 10 PERCENT OF DIVINYLBENZENE, ON A MOLAR BASIS, SAID COPOLYMER BEING IN THE FORM OF DISCRETE PARTICLES, AND A TERTIARY AMINE SELECTED FROM THE GROUP CONSISTING OF TRIMETHYLAMINE AND DIMETHYLETHYLETHANOLAMINE.
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) | 1964-07-17 | 1965-01-16 | 1965-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-17 | 1969-01-16 | 1969-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-17 | 1973-01-16 | 1973-07-18 | $7700.00 | Window Closed / Lapsed |