US2837488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of cation-exchange resins containing hydroxyl and phosphonic acid groups
Assignee: Rohm and Haas Co
•
Filing: 1954-06-10
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Granted: 1958-06-03
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Expires: 1974-06-10
Abstract
No abstract record available.
Inventors
- 👤 Arthur F Ferris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:43
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/08; B01J39/12; B01J39/16; B01J39/18; B01J39/20; C; C08; C08F; C08F8/00; C08F8/40; C08F216/00; C08F216/36; C08F2810/00; C08F2810/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
A CATION-EXCHANGE RESIN COMPRISING A CROSS-LINKED COPOLYMER OF A KETONE HAVING THE FORMULA
Claim 2
Dependent Claim
13 words
A CATION-EXCHANGE RESIN COMPRISING A CROSS-LINKED COPOLYMER OF A KETONE HAVING THE FORMULA
References Cited (Backward Citations)
US1937063A
Cited
US2694684A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |