US3228920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chelating resins and method of preparation
Assignee: Metal Recovery Systems
•
Filing: 1960-05-12
•
Granted: 1966-01-11
•
Expires: 1980-05-12
Abstract
No abstract record available.
Inventors
- 👤 Alelio Gaetano F D
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:29
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/32; C08G59/3209; B; B01; B01J; B01J45/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
A CROSS-LINKED POLYMER HAVING A PLURALITY OF REPEATING UNITS IN THE LINEAR CHAINS THEREOF HAVING A FORMULA SELECTED FROM THE CLASS CONSISTING OF:
Claim 2
Dependent Claim
23 words
A CROSS-LINKED POLYMER HAVING A PLURALITY OF REPEATING UNITS IN THE LINEAR CHAINS THEREOF HAVING A FORMULA SELECTED FROM THE CLASS CONSISTING OF:
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Cited
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Cited
US3090771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |