US2775564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacture of strongly basic anion exchangers
Assignee: Stamicarbon BV
•
Filing: 1953-10-26
•
Granted: 1956-12-25
•
Expires: 1973-10-26
Abstract
No abstract record available.
Inventors
- 👤 Jong Geert J De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:30
CPC Classifications
B; B01; B01J; B01J41/00; B01J41/08; B01J41/12; B01J41/13
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
47 words
A PROCESS FOR THE MANUFACTURE OF A WATER INSOLUBLE RESINOUS PRODUCT HAVING STRONGLY BASIC ANION EXCHANGING PROPERTIES, WHICH COMPRISES REACTING A METHYL TRI (METHOXYPHENYL) PHOSPHONIUM SALT WITH FORMALDEHYDE IN THE PRESENCE OF CONCENTRATED SULFURIC ACID TO OBTAIN A RESIN AND SUBSEQUENTLY WASHING THE RESULTING RESIN WITH ALKALI.
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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) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |