US2801222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anion exchange resins containing keto groups
Assignee: Permutit Co
•
Filing: 1952-06-04
•
Granted: 1957-07-30
•
Expires: 1972-06-04
Abstract
No abstract record available.
Inventors
- 👤 Albert H Greer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:54
CPC Classifications
C; C08; C08F; C08F26/00; C08F26/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
A HIGHLY BASIC ANION EXCHANGE RESIN COMPRISING A CROSS-LINKED POLYMERIZATE OF A QUATERNARY AMMONIUM COMPOUND HAVING A FORMULA SELECTED FROM THE FORMULAE:
Claim 2
Dependent Claim
22 words
A HIGHLY BASIC ANION EXCHANGE RESIN COMPRISING A CROSS-LINKED POLYMERIZATE OF A QUATERNARY AMMONIUM COMPOUND HAVING A FORMULA SELECTED FROM THE FORMULAE:
References Cited (Backward Citations)
US2276149A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-29 | 1961-01-28 | 1961-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-29 | 1965-01-28 | 1965-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-29 | 1969-01-28 | 1969-07-30 | $7700.00 | Window Closed / Lapsed |