US2900353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined electron and ion exchange compositions
Assignee: Research Corp
•
Filing: 1954-11-15
•
Granted: 1959-08-18
•
Expires: 1974-11-15
Abstract
No abstract record available.
Inventors
- 👤 Harold G Cassidy
- 👤 Ezrin Myer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:22
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F8/36; C08F2800/00; C08F2800/10; C08F2800/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
THE PRODUCT OBTAINED BY THE SULFONATION OF A COPOLYMER OF VINYHYDROQUINONE WITH A MONOMER OF THE FORMULA FORMULA
Claim 2
Dependent Claim
18 words
THE PRODUCT OBTAINED BY THE SULFONATION OF A COPOLYMER OF VINYHYDROQUINONE WITH A MONOMER OF THE FORMULA FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |