US3453354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of manufacturing ion-exchange membranes
Assignee: US Filter Wallace and Tiernan Inc
•
Filing: 1965-12-27
•
Granted: 1969-07-01
•
Expires: 1985-12-27
Abstract
No abstract record available.
Inventors
- 👤 Alvaro R Tejeda
- 👤 Vincent G Sarli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:39
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2275; C08J5/2281; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; C08J2327/00; C08J2327/02; C08J2327/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |