US4251377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation device of cordierite ceramic and α-alumina
Assignee: EIDP Inc
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Filing: 1979-08-28
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Granted: 1981-02-17
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Expires: 1999-08-28
Abstract
Abstract A ceramic filamentary structure particularly useful in ultrafiltration applications composed of cordierite ceramic and a quantity of α-alumina substantially in excess of that required to form the cordierite.
Inventors
- 👤 Henry M. Schleinitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:17
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/10; B01D69/108; B01D61/00; B01D61/14; B01D61/18; B01D69/08; B01D71/00; B01D71/02; B01D71/024; B82; B82Y; B82Y30/00; C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/117; C04B35/622; C04B35/62227; C04B35/62231; C04B35/6224; C04B35/62245; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63436; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/34; C04B2235/3427; C04B2235/3463; C04B2235/3481; C04B2235/349; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/526; C04B2235/5264; C04B2235/5284; C04B2235/54; C04B2235/5418; C04B2235/5436; C04B2235/5463; C04B2235/60; C04B2235/602; C04B2235/6021; C04B2235/6028; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
In a self-supporting, unitary structure comprising rigid, porous, inorganic hollow filament arranged in a three-dimensional network of hollow filament, the hollow filament defining tortuous paths for fluid passing through the network, the improvement wherein the inorganic hollow filament comprises complementarily about from 5 to 50% cordierite ceramic and about from 95 to 50% α-alumina, the α-alumina being in excess of the stoichiometric proportion needed to form the cordierite ceramic.
Claim 2
Dependent Claim
69 words
In a self-supporting, unitary structure comprising rigid, porous, inorganic hollow filament arranged in a three-dimensional network of hollow filament, the hollow filament defining tortuous paths for fluid passing through the network, the improvement wherein the inorganic hollow filament comprises complementarily about from 5 to 50% cordierite ceramic and about from 95 to 50% α-alumina, the α-alumina being in excess of the stoichiometric proportion needed to form the cordierite ceramic.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |