US3037945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anion exchanging and chelating resins having primary amino groups
Assignee: Dow Chemical Co
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Filing: 1959-01-14
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Granted: 1962-06-05
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Expires: 1979-01-14
Abstract
No abstract record available.
Inventors
- 👤 Leo R Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:41
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/14; C08F212/16; C08F212/18; C08F8/00; C08F8/30; C08F8/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A METHOD FOR MAKING AN ANION EXCHANGING AND CHELATING RESIN WHEREIN A HALOMETHYLATED COPOLYMER OF A MONOVINYLARYL HYDROCARBON AND FROM ABOUT 1 TO ABOUT 4 WEIGHT PERCENT OF A DIVINYLARYL HYDROCARBON, SAID COPOLYMER CONTAINING BETWEEN ABOUT 0.5 AND ABOUT 1.2 HALOMETHYL GROUPS PER ARYL NUCLEUS IS REACTED BY HEATING AT ABOUT 40* TO ABOUT 100*C, WITH AT LEAST A STOICHIOMETRIC EQUIVALENT OF A SCHIFF BASE PREPARED FROM A POLYALKYLENE POLYAMINE HAVING 2 PRIMARY AMINO GROUPS AND FROM 1 TO 4 SECONDARY AMINO GROUPS AND AN ALDEHYDE HAVING FROM 1 TO 3 CARBON ATOMS, AND HYDROLYZING OFF THE COMBINED ALDEHYDE TO LEAVE PRIMARY AMINO GROUPS, WHEREBY POLYALKYLENE POLYAMINE RESIDUES ARE LINKED AT BENZYLIC CARBON ATOMS OF SAID COPOLYMER THROUGH A SECONDARY AMINO NITROGEN OF SAID POLYALKYLENE POLYAMINE.
Claim 2
Independent Claim
126 words
A METHOD FOR MAKING AN ANION EXCHANGING AND CHELATING RESIN WHEREIN A HALOMETHYLATED COPOLYMER OF A MONOVINYLARYL HYDROCARBON AND FROM ABOUT 1 TO ABOUT 4 WEIGHT PERCENT OF A DIVINYLARYL HYDROCARBON, SAID COPOLYMER CONTAINING BETWEEN ABOUT 0.5 AND ABOUT 1.2 HALOMETHYL GROUPS PER ARYL NUCLEUS IS REACTED BY HEATING AT ABOUT 40* TO ABOUT 100*C, WITH AT LEAST A STOICHIOMETRIC EQUIVALENT OF A SCHIFF BASE PREPARED FROM A POLYALKYLENE POLYAMINE HAVING 2 PRIMARY AMINO GROUPS AND FROM 1 TO 4 SECONDARY AMINO GROUPS AND AN ALDEHYDE HAVING FROM 1 TO 3 CARBON ATOMS, AND HYDROLYZING OFF THE COMBINED ALDEHYDE TO LEAVE PRIMARY AMINO GROUPS, WHEREBY POLYALKYLENE POLYAMINE RESIDUES ARE LINKED AT BENZYLIC CARBON ATOMS OF SAID COPOLYMER THROUGH A SECONDARY AMINO NITROGEN OF SAID POLYALKYLENE POLYAMINE.
References Cited (Backward Citations)
US2840533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-04 | 1965-12-04 | 1966-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-04 | 1969-12-04 | 1970-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-04 | 1973-12-04 | 1974-06-05 | $7700.00 | Window Closed / Lapsed |