US4629563B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asymmetric membranes
Assignee: Pall Filtration and Separations Group Inc
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Filing: 1981-08-11
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Granted: 1997-06-03
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Expires: 2001-08-11
Abstract
No abstract record available.
Inventors
- 👤 Wolfgang J Wrasidlo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:30
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/02; B01D61/00; B01D61/14; B01D61/145; B01D61/147; B01D63/00; B01D65/00; B01D65/10; B01D65/102; B01D67/00; B01D67/0002; B01D67/0009; B01D67/0011; B01D67/00111; B01D2323/00; B01D2323/08; B01D2323/081; B01D2323/12; B01D2325/00; B01D2325/02; B01D2325/022; B01D2325/20
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) | 2000-06-02 | 2000-12-02 | 2001-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-02 | 2004-12-02 | 2005-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-02 | 2008-12-02 | 2009-06-03 | $7700.00 | Window Closed / Lapsed |