US3791999A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing a cross-linked porous copolymer
Assignee: Mitsubishi Chemical Corp
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Filing: 1971-12-16
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Granted: 1974-02-12
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Expires: 1991-12-16
Abstract
Abstract A CYANO GROUP-CONTAINING CROSS-LINKED POROUS COPOLYMER, WHICH IS LARGE IN SURFACE AREA AND HIGH IN POROSITY AND HIGH IN ADSORPTIVITY FOR POLAR SUBSTANCES IS OBTAINED BY POLYMERIZING A MONOVINYL CYANIDE, OR A MONOVINYLIDENE CYANIDE, MONOMER, WITH A POLYVINYL MONOMER, IN THE PRESENCE OF AN ORGANIC SOLVENT WHICH IS INERT TO THESE MONOMERS, AND WHICH FUNCTIONS BOTH AS A SOLVENT THEREFOR AND AS A SWELLING AGENT FOR THE RESULTING COPOLYMER, AND WITH A LINEAR MONOVINYL POLYMER, WHICH IS CAPABLE OF FORMING A HOMOGENEOUS LIQUID PHASE WITH THE MONOMERS AND THE SOLVENT, AND THEREAFTER REMOVING THE LINEAR POLYMER FROM THE RESULTING COPOLYMER BY EXTRACTION.
Inventors
- 👤 Y Fuchiwaki
- 👤 T Nishikaji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:41
CPC Classifications
C; C08; C08F; C08F291/00; B; B01; B01J; B01J20/00; B01J20/22; B01J20/26; B01J20/261; B01J20/264; B01J20/265; B01J20/267; B01J20/281; B01J20/282; B01J20/285; B01J2220/00; B01J2220/50; B01J2220/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |