US2442989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anion exchange resins
Assignee: Permutit Co
•
Filing: 1942-06-16
•
Granted: 1948-06-08
•
Expires: 1962-06-16
Abstract
No abstract record available.
Inventors
- 👤 Sussman Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:20
CPC Classifications
C; C08; C08G; C08G12/00; B; B01; B01J; B01J41/00; B01J41/08; B01J41/12; B01J41/13; C08G12/02; C08G12/04; C08G12/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB466346A
Cited
US2276309A
Cited
US2198874A
Cited
US2223930A
Cited
CH208535A
Cited
US2272783A
Cited
US2259169A
Cited
US2286752A
Cited
US2251234A
Cited
US2362086A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-08 | 1951-12-08 | 1952-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-08 | 1955-12-08 | 1956-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-08 | 1959-12-08 | 1960-06-08 | $7700.00 | Window Closed / Lapsed |