US3423491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permselective hollow fibers and method of making
Assignee: Dow Chemical Co
•
Filing: 1964-09-02
•
Granted: 1969-01-21
•
Expires: 1984-09-02
Abstract
No abstract record available.
Inventors
- 👤 Earl A Mclain
- 👤 Henry I Mahon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:54
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0002; B01D67/0023; B01D67/003; B01D69/00; B01D69/08; D; D01; D01D; D01D5/00; D01D5/24; D01F; D01F1/00; D01F1/02; D01F1/10; D01F2/00; D01F2/24; D01F2/28; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2214442A
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US2435071A
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US2461339A
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US2707201A
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US2915483A
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US3075242A
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US3228877A
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US3228876A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |