US2805196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permselective electrodialysis
Assignee: Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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Filing: 1953-02-06
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Granted: 1957-09-03
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Expires: 1973-02-06
Abstract
No abstract record available.
Inventors
- 👤 Roebersen Hermannus Gerhardus
- 👤 Cornelis Van Bochove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:46
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2212; C08J2301/00; C08J2301/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
36 words
PROCESS FOR ELECTRODIALYZING SALT-CONTAINING SOLUTIONS WITH APPLICATION OF MEMBRANES OF HIGH-MOLECULAR MATERIAL OF THE CLASS CONSISTING OF CELLULOSE, AMYLOSE AND POLYVINYLALCOHOL, IN WHICH HYDROGEN ATOMS OF REACTIVE HYDROXYL GROUPS HAVE AT LEAST BEEN PARTLY REPLACED BY
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US2322888A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |