Patent US2770761A successfully refreshed from Google Patents.
US3422008A
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Wound hollow fiber permeability apparatus and process of making the same
Assignee: Dow Chemical Co
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Filing: 1963-10-24
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Granted: 1969-01-14
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Expires: 1983-10-24
Abstract
No abstract record available.
Inventors
- 👤 Earl A Mclain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:31
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/02; B01D63/04; B01D63/043; B01D53/00; B01D53/22; B01D63/021; B01D63/0233; B01D63/024; B01D63/025; C; C01; C01B; C01B2203/00; C01B2203/04; C01B2203/0405; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/496; Y10T29/49604
Claims Analysis
Total Claims: 0
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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) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |