Patent US2187818A successfully refreshed from Google Patents.
US2187818A
Expired / Lapsed
US
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Dialyzing apparatus
Assignee: IG Farbenindustrie AG
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Filing: 1937-04-13
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Granted: 1940-01-23
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Expires: 1957-04-13
Abstract
No abstract record available.
Inventors
- 👤 Johannes Walter
- 👤 Zetzsche Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:53
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/24; B01D61/28; B01D2313/00; B01D2313/20; B01D2313/201
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-01-22 | 1943-07-24 | 1944-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-01-22 | 1947-07-24 | 1948-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-01-22 | 1951-07-24 | 1952-01-23 | $7700.00 | Window Closed / Lapsed |