Patent US3546209A successfully refreshed from Google Patents.
US3546209A
Expired / Lapsed
US
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Process for the fabrication of a cellulose hollow fiber separatory cell
Assignee: Dow Chemical Co
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Filing: 1968-10-10
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Granted: 1970-12-08
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Expires: 1988-10-10
Abstract
No abstract record available.
Inventors
- 👤 Ben J Lipps Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:59
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/10; B01D67/00; B01D67/0081; B01D67/0093; B01D67/00931; B01D69/00; B01D69/08; B01D71/12; B01D71/14; B01D71/16; B01D2323/00; B01D2323/15; B01D2323/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3276996A
Cited
US3423491A
Cited
US3290286A
Cited
US3412184A
Cited
US3432584A
Cited
US3441142A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-07 | 1974-06-08 | 1974-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-07 | 1978-06-08 | 1978-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-07 | 1982-06-08 | 1982-12-08 | $7700.00 | Window Closed / Lapsed |