Katsushi Isogawa

US Patent:

6936093, Aug 30, 2005

Filed:

Feb 27, 2003

Appl. No.:

10/375950

Inventors:

Katsushi Isogawa - Eagan MN, US
Carl J. Soldner - Apple Valley MN, US
Kristin Fischer - Burnsville MN, US
Vijay K. Garikipati - Eagan MN, US
James P. Hand - Lakeville MN, US

Assignee:

Donaldson Company, Inc. - Minneapolis MN

International Classification:

B03C003/155
B01D046/12
B01D053/04

US Classification:

96 55, 96 58, 96121, 96132, 96135, 96147, 96153, 96154, 553856

Abstract:

A multilayer filter assembly for use inside an electronic enclosure, such as a hard disk drive enclosure containing a rotating disk, is disclosed. The filter assembly provides filtration of air entering the enclosure, as well as air circulating within the enclosure. The filter assembly is generally a single-piece unit that can be formed without a rigid frame, thus allowing the filter assembly to be produced at a reduced cost. In one implementation of the invention, the multilayer filter assembly contains at least two particulate removal layers covering, enclosing, and dividing at least two adsorbent regions. One of the adsorbent regions is configured to be placed flush against an interior wall of the electronic enclosure to allow air to flow in and out of the enclosure, while the other adsorbent region is configured to be placed in an upright position in the enclosure with exposed surfaces that allow airflow through this portion of the filter assembly.

US Patent:

7125433, Oct 24, 2006

Filed:

Dec 31, 2003

Appl. No.:

10/749793

Inventors:

Vijay Kumar Garikipati - Eagan MN, US
Patrick L. McPhail - Minneapolis MN, US
Shu Lam Sin - Hong Kong, HK
Katsushi Isogawa - Eagan MN, US

Assignee:

Donaldson Company, Inc. - Minneapolis MN

International Classification:

B01D 53/02
G11B 33/14

US Classification:

553856, 96139, 360 9702

Abstract:

A multiple diffusion channel filter assembly is disclosed. The filter assembly provides filtration of air entering and exiting an electronic enclosure through a breather hole. In one implementation, the filter assembly contains a housing with an adsorbent component and a first diffusion channel and a second diffusion channel. In another implementation, the filter assembly contains a first layer and a second layer which surround an adsorbent component and a first and a second diffusion channel that are in fluid communication with the interior space defined by the first and second layers. In yet another implementation, the invention, includes a filter accessory containing a diffusion channel configured to work in conjunction with a separate filter assembly thereby adding an additional diffusion channel to the existing design.

US Patent:

7367997, May 6, 2008

Filed:

Jul 11, 2005

Appl. No.:

11/179788

Inventors:

Katsushi Isogawa - Eagan MN, US

Assignee:

Donaldson Company, Inc. - Minneapolis MN

International Classification:

B03C 3/155

US Classification:

553856, 96 68, 96 69, 96134, 96154, 360 9702

Abstract:

The present invention is directed to an improved electronic enclosure filter for very small spaces, such as small disk drives. The filter includes an exposed electrostatic layer that functions to catch and retain particulate contamination within the filter. The filter can be placed within disk drive enclosures such that the electrostatic layer is in very close proximity to the rotating disk without causing excessive turbulence. The close proximity of the electrostatic layer to the disk creates relatively high levels of airflow over the electrostatic layer.

US Patent:

7404836, Jul 29, 2008

Filed:

May 11, 2004

Appl. No.:

10/843215

Inventors:

Vijay K. Garikipati - Eagan MN, US
Katsushi Isogawa - Eagan MN, US
Stanley B. Miller - Eden Prairie MN, US
Carl Soldner - Apple Valley MN, US

Assignee:

Donaldson Company, Inc. - Minneapolis MN

International Classification:

G11B 17/02
B01D 53/04

US Classification:

553856, 96134, 96140, 96142, 360 9702, 360 9703

Abstract:

A filter assembly for use in a disk drive assembly is disclosed. The filter assembly is configured to remove contaminants within the drive assembly and to prevent entry of contaminants into the drive assembly. In one implementation the filter assembly includes a housing configured for placement in a disk drive assembly containing a rotating disk, the housing including an air scoop having an entrance configured for placement beneath the rotating disk in the drive assembly; and a major surface having a wall and an opening in the wall, the opening configured for receiving a filter material and being in fluid communication with the entrance to the air scoop. A filter element is positioned within the housing and configured so that a first portion of the element filters air directed from the air scoop, while a second portion of the element filters air from the exterior of the drive assembly, the first and second portions sealed by a common filter material placed over the opening in the major surface.

US Patent:

20040151966, Aug 5, 2004

Filed:

Dec 2, 2003

Appl. No.:

10/727027

Inventors:

Andrew Dahlgren - Chanhassen MN, US
Katsushi Isogawa - Eagan MN, US
Robert Nelson - Hastings MN, US
Eivind Stenersen - River Falls WI, US
Daniel Tuma - St. Paul MN, US

International Classification:

H01M008/04

US Classification:

429/034000

Abstract:

Filter assemblies that manage the movement of gases and water to and from the anode and cathode of fuel cells. The assemblies are particularly suited for methanol and other liquid fuel sources for portable hydrogen fuel cells. These fuel cells and filter elements can be used with equipment such as telephones, personal computing devices, lap top computers, and pagers. The invention provides a filter assembly that forms a selectively permeable barrier between the exterior of the fuel cell and the cathode. The filter assembly manages the exposure of the cathode to particulate and gaseous materials. The filter assembly can also manage the movement of water. The invention also provides a filter assembly that forms a selectively permeable barrier between liquid (e.g., methanol and water) and the exterior of the fuel cell. The filter assembly manages the movement of liquids and gaseous materials away from the anode.

US Patent:

20060191249, Aug 31, 2006

Filed:

Nov 9, 2005

Appl. No.:

11/270311

Inventors:

Mark Gogins - Roseville MN, US
Katsushi Isogawa - Eagan MN, US
Kristine Graham - Minnetonka MN, US

International Classification:

B01D 39/16

US Classification:

055528000

Abstract:

The present invention is directed to a filter assembly for use inside an electronic enclosure, such as a hard disk drive enclosure containing a rotating disk. The filter assembly provides filtration of air within the electronic enclosure, and optionally for air entering the electronic enclosure. Thus, the invention is directed in part to a filter assembly for use in an electronic enclosure, the filter assembly comprising particulate removal media. In certain embodiments the particulate removal media comprising a fine fiber layer containing a hydrophobic additive and at least one polymer. In some implementations it includes a blend of two or more polymers.

US Patent:

20080236397, Oct 2, 2008

Filed:

May 5, 2008

Appl. No.:

12/115164

Inventors:

Katsushi Isogawa - Eagan MN, US

Assignee:

DONALDSON COMPANY, INC. - Minneapolis MN

International Classification:

B03C 3/155

US Classification:

96134

Abstract:

The present invention is directed to an improved electronic enclosure filter for very small spaces, such as small disk drives. The filter includes an exposed electrostatic layer that functions to catch and retain particulate contamination within the filter. The filter can be placed within disk drive enclosures such that the electrostatic layer is in very close proximity to the rotating disk without causing excessive turbulence. The close proximity of the electrostatic to the disk creates relatively high levels of airflow over the electrostatic.

US Patent:

60773359, Jun 20, 2000

Filed:

Jul 12, 1999

Appl. No.:

9/352183

Inventors:

Kirk A. Schneider - Eden Prairie MN
Henry J. Drasner - Edina MN
Allan L. Liebrenz - Excelsior MN
Katsushi Isogawa - Rosemount MN
Stanley Bucknam Miller - Eden Prairie MN
Paul Lawrence Kojetin - Rosemount MN
Cynthia D. Bellefeuille - Eden Prairie MN
Andrew J. Dallas - Apple Valley MN
Suzan K. Nunnink - Delano MN

Assignee:

Donaldson Company, Inc. - Minneapolis MN

International Classification:

B01D 5304
B01D 4610

US Classification:

96135

Abstract:

A filter is provided which includes an organic vapor adsorbing layer, a first particulate removal layer, and a second particulate removal layer. The organic vapor adsorbing layer includes porous adsorbent beads which allow air or gas to flow therethrough with little resistance and provide increased surface area by virtue of the pores. The particulate removal layer can be made from an electrostatic and/or polytetraflouroethylene. The filter can have a figure of merit greater than about 10 and a capacity for permanently adsorbing organic vapors, wherein the figure of merit is calculated based upon a fractional efficiency determined for particles having a size of 0. 3. mu. m in an air flow having a velocity of 10. 5 ft. /min and for Frazier permeability at 0. 5 inches H. sub. 2 O.