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Patent US6394281B2 successfully refreshed from Google Patents.
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US6394281B2 Expired / Lapsed US ⏱️ 0.0 years remaining

Ceramic filter element

Assignee: Coorstek Inc
•
Filing: 2001-03-09
•
Granted: 2002-05-28
•
Expires: 2021-03-09
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Abstract

Abstract A process for sealing a ceramic filter by infiltrating a metal into an end of the filter is disclosed. The process includes the steps of contacting the end of a porous ceramic filter with a molten metal, whereby the metal enters into the ceramic matrix to substantially fill the void space. The ceramic filter is cooled to form a filter having a ceramic-metal composite portion. The present invention also provides a filter having an infiltrated metal seal. Methods for joining infiltrated ends are also provided.

Inventors

  • 👤 Marcus A. Ritland
  • 👤 Dennis W. Readey
  • 👤 Richard N. Kleiner
  • 👤 Jack D. Sibold
  • 👤 Kyle Knudson
  • 👤 Steven Landin
  • 👤 Paul Thoen

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 14:32
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/19; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/31; B01D29/35; B01D29/50; B01D29/52; B01D46/00; B01D46/0001; B01D46/24; B01D46/2403; B01D46/2418; B01D46/2425; B01D46/2429; B01D46/24491; B01D46/24492; B01D46/2451; B01D46/2476; B01D53/00; B01D53/02; B01D53/04; B01D53/0407; B01D63/00; B01D63/06; B01D63/061; B01D63/066; B01D65/00; B01D65/003; B32; B32B; B32B18/00; C; C04; C04B; C04B37/00; C04B37/001; C04B37/02; C04B37/023; C04B37/026; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/51; C04B41/5127; C04B41/5144; C04B41/52; C04B41/80; C04B41/81; C04B41/85; C04B41/88; C04B41/89; C22; C22C; C22C1/00; C22C1/10; C22C1/1005; C22C1/1015; C22C1/1036; C22C1/1057; C22C1/1063; C22C29/00; C22C29/12; F; F01; F01L; F01L3/00; F01L3/02; F01L3/22; F02; F02F; F02F3/00; F02F7/00; F02F7/0085; F02F7/0087; H; H05; H05K; H05K3/00; H05K3/40; H05K3/4038; H05K3/4053; H05K3/4061; H10; H10W; H10W70/00; H10W70/01; H10W70/05; H10W70/095; H10W70/60; H10W70/611; H10W70/62; H10W70/63; H10W70/635; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0446; B01D2201/34; B01D2201/40; B01D2201/403; B01D2201/46; B01D2253/00; B01D2253/10; B01D2253/104; B01D2253/106; B01D2253/112; B01D2253/1124; B01D2253/25; B01D2253/30; B01D2253/302; B01D2253/308; B01D2253/311; B01D2271/00; B01D2271/02; B01D2271/025; B23K2103/00; B23K2103/16; C04B2111/00; C04B2111/00474; C04B2111/00793; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/121; C04B2237/123; C04B2237/124; C04B2237/125; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/341; C04B2237/343; C04B2237/345; C04B2237/346; C04B2237/348; C04B2237/36; C04B2237/365; C04B2237/366; C04B2237/368; C04B2237/40; C04B2237/405; C04B2237/406; C04B2237/50; C04B2237/61; C04B2237/62; C04B2237/68; C04B2237/70; C04B2237/708; C04B2237/72; C04B2237/76; C04B2237/765; C04B2237/78; C04B2237/80; C04B2237/84; F01L2301/00; F01L2301/02; F02B; F02B3/00; F02B3/06; F05; F05C; F05C2201/00; F05C2201/04; F05C2201/0403; F05C2201/0415; F05C2203/00; F05C2203/08; F05C2203/0865; F05C2203/0895; F05C2253/00; F05C2253/16; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K2201/00; H05K2201/01; H05K2201/0104; H05K2201/0116; H05K2203/00; H05K2203/12; H05K2203/128; Y; Y10; Y10S; Y10S228/00; Y10S228/903; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49885; Y10T29/4998; Y10T29/49982; Y10T29/49988

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 82 words
A ceramic filter element for a filtration device, comprising: (a) a substantially cylindrical sintered ceramic porous support having channels therethrough; and (b) a metal comprising from about 1.5 weight percent to about 10 weight percent oxygen infiltrated into an end portion of said ceramic filter element by capillary action to form a ceramic-metal composite portion wherein said ceramic metal composite portion creates a substantially hermetic internal seal within said porous support and wherein said channels are not substantially filled with said metal.
Claim 2
Dependent Claim 82 words
A ceramic filter element for a filtration device, comprising: (a) a substantially cylindrical sintered ceramic porous support having channels therethrough; and (b) a metal comprising from about 1.5 weight percent to about 10 weight percent oxygen infiltrated into an end portion of said ceramic filter element by capillary action to form a ceramic-metal composite portion wherein said ceramic metal composite portion creates a substantially hermetic internal seal within said porous support and wherein said channels are not substantially filled with said metal.
Claim 3
Dependent Claim 24 words
The ceramic filter element of claim 1 , further comprising a connecting means, wherein said connecting means is attached to said ceramic-metal composite portion.
Claim 4
Dependent Claim 20 words
The ceramic filter element of claim 2 , wherein said connecting means comprises a swage fitting or a compression fitting.
Claim 5
Dependent Claim 15 words
The ceramic filter element of claim 2 , wherein said connecting means comprises a weld.
Claim 6
Dependent Claim 15 words
The ceramic filter element of claim 2 , wherein said connecting means comprises a braze.
Claim 7
Dependent Claim 16 words
The ceramic filter element of claim 2 , wherein said connecting means comprises a metal bellows.
Claim 8
Dependent Claim 35 words
The ceramic filter element of claim 2 , wherein said connecting means comprises threads formed into said ceramic-metal composite portion before or after metal infiltration for screwing said ceramic filter element into a threaded member.
Claim 9
Dependent Claim 24 words
The ceramic filter element of claim 1 , further comprising a supporting ring, wherein said supporting ring is attached to said ceramic-metal composite portion.
Claim 10
Dependent Claim 17 words
The ceramic filter element of claim 8 , wherein said supporting ring is a stainless steel ring.
Claim 11
Dependent Claim 15 words
The ceramic filter element of claim 1 , wherein said filter element comprises alumina ceramic.
Claim 12
Dependent Claim 27 words
The ceramic filter element of claim 1 , wherein said filter element has an open porosity of from about 30 volume percent to about 50 volume percent.

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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) 2005-05-27 2005-11-26 2006-05-28 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2009-05-27 2009-11-26 2010-05-28 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2013-05-27 2013-11-26 2014-05-28 $7700.00 Window Closed / Lapsed

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