US3677979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfonated phenol-aldehyde resins
Assignee: Monsanto Co
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Filing: 1971-01-21
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Granted: 1972-07-18
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Expires: 1991-01-21
Abstract
Abstract THERMOSETTABLE WATER-SOLUBLE PHENOLIC TWO-COMPONENT MIXED RESIN COMPOSITIONS HAVING SULFONIC ACID GROUPS CHEMICALLY COMBINED THEREINTO ESPECIALLY USEFUL IN THE MANUFACTURE OF POROUS ION-EXCHANGE MEDIA. THESE COMPOSITIONS ARE PREFERABLY PREPARED AS AQUEOUS SOLUTIONS HAVING A PH RANGING FROM ABOUT 6.5 TO 8.0. METHODS FOR MANUFACTURE ARE DESCRIBED.
Inventors
- 👤 Raymond D Beaulieu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:32
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2256; B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/19; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/18; C08G8/24; C08L; C08L61/00; C08L61/04; C08L61/06; C08J2381/00
Claims Analysis
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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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |