Patents by Inventor Fred H. Wahlquist
Fred H. Wahlquist has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20040139707Abstract: A V-pack filter includes a frame construction having a first frame structure and a second frame structure. The V-pack filter also includes first and second panel sections mounted in extension between the first and second frame structures. The first panel section has first and second ends. The second panel section has third and fourth ends. The first and third ends have a first distance therebetween while the second and fourth ends have a second distance therebetween. The second distance is generally greater than the first distance. The first and second panel sections and the second frame structure define an air flow aperture. A seal arrangement circumscribes the air flow aperture and projects outwardly from the second frame structure. The first frame structure defines a first receiver indent. Assemblies and methods are also included.Type: ApplicationFiled: January 12, 2004Publication date: July 22, 2004Applicant: Donaldson Company, Inc.Inventors: Gary R. Gillingham, Stan M. Koehler, William J. Krisko, Thomas G. Miller, Winston E. Olson, Fred H. Wahlquist, Ervin P. Fuchs, Eugene D. Wilson
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Patent number: 6676721Abstract: A V-pack filter includes a frame construction having a first frame structure and a second frame structure. The V-pack filter also includes first and second panel sections mounted in extension between the first and second frame structures. The first panel section has first and second ends. The second panel section has third and fourth ends. The first and third ends have a first distance therebetween while the second and fourth ends have a second distance therebetween. The second distance is generally greater than the first distance. The first and second panel sections and the second frame structure define an air flow aperture. A seal arrangement circumscribes the air flow aperture and projects outwardly from the second frame structure. The first frame structure defines a first receiver indent. Assemblies and methods are also included.Type: GrantFiled: April 12, 2002Date of Patent: January 13, 2004Assignee: Donaldson Company, Inc.Inventors: Gary R. Gillingham, Stan M. Koehler, William J. Krisko, Thomas G. Miller, Winston E. Olson, Fred H. Wahlquist, Ervin P. Fuchs, Eugene D. Wilson
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Publication number: 20030121845Abstract: Fluted filter media includes filter material having a plurality of flutes formed therein having alternating ends of adjacent flutes closed to force fluid through filter material. A first embodiment of the filter media includes tapered flutes which have the open ends of the flutes larger in cross-section than the closed flutes, wherein the upstream open flutes converge toward the downstream end and the upstream closed end flutes diverge toward the downstream end. A second embodiment includes filter media which is asymmetric formed with dissimilar upstream and downstream flute cross-sections with larger flute openings to the upstream side of the filter. A third embodiment includes filter media with an upstream edge crushed to improve flow at the upstream edge. A fourth embodiment includes filter media with the upstream sealing material recessed from the upstream edge for reducing effects from blockages at the upstream edge of the filter.Type: ApplicationFiled: February 21, 2003Publication date: July 3, 2003Applicant: Donaldson Company, Inc.Inventors: Wayne M. Wagner, Gary R. Gillingham, Joseph C. Tokar, Daniel T. Risch, Jim C. Rothman, Fred H. Wahlquist, Bernard A. Matthys, Gregory L. Reichter, Stephen W. Sabelko, Bryan D. Patten
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Patent number: 6213146Abstract: A valve assembly includes a housing and a float. The housing is constructed and arranged to inhibit movement of the float between a resting position to a position where it is situated in its valve seat, unless a selected liquid volume within the valve housing is attained. In one embodiment, a series of projection members or rings creates a tortuous path, such that there is no clear path for the float to reach the valve seat. In another embodiment, vacuum pressure is created between the float and its cup support. Still other embodiments utilize magnets, springs, linkages, and bent wires. Methods for preventing liquid ingestion into an engine through an air intake are also provided.Type: GrantFiled: December 7, 1999Date of Patent: April 10, 2001Assignee: Donaldson Company, Inc.Inventors: Daniel T. Risch, Gary R. Gillingham, Fred H. Wahlquist, Wayne M. Wagner, Joseph C. Tokar, Bernard A. Matthys, Pete A. Betts
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Patent number: 6209559Abstract: A valve assembly includes a housing and a float. The housing is constructed and arranged to inhibit movement of the float between a resting position to a position where it is situated in its valve seat, unless a selected liquid volume within the valve housing is attained. In one embodiment, a series of projection members or rings creates a tortuous path, such that there is no clear path for the float to reach the valve seat. In another embodiment, vacuum pressure is created between the float and its cup support. Still other embodiments utilize magnets, springs, linkages, and bent wires. Methods for preventing liquid ingestion into an engine through an air intake are also provided.Type: GrantFiled: December 7, 1999Date of Patent: April 3, 2001Assignee: Donaldson Company, Inc.Inventors: Daniel T. Risch, Gary R. Gillingham, Fred H. Wahlquist, Wayne M. Wagner, Joseph C. Tokar, Bernard A. Matthys, Pete A. Betts
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Patent number: 6009898Abstract: A valve assembly includes a housing and a float. The housing is constructed and arranged to inhibit movement of the float between a resting position to a position where it is situated in its valve seat, unless a selected liquid volume within the valve housing is attained. In one embodiment, a series of projection members or rings creates a tortuous path, such that there is no clear path for the float to reach the valve seat. In another embodiment, vacuum pressure is created between the float and its cup support. Still other embodiments utilize magnets, springs, linkages, and bent wires. Methods for preventing liquid ingestion into an engine through an air intake are also provided.Type: GrantFiled: September 17, 1998Date of Patent: January 4, 2000Assignee: Donaldson Company, Inc.Inventors: Daniel T. Risch, Gary R. Gillingham, Fred H. Wahlquist, Wayne M. Wagner, Joseph C. Tokar, Bernard A. Matthys, Pete A. Betts
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Patent number: 5902364Abstract: A conical filter device inserts into a duct having flow passing from upstream to downstream. The filter device includes fluted filter media having flutes formed therein and a housing. The filter forms a seal between the outer edge of the filter at the downstream side and the housing. The upstream face of the filter is conical shaped in a first embodiment and frusto-conical in a second embodiment with the housing roughly corresponding to the shape of the filter. The filter elements are formed by winding layers of filter media to form a circular cross-section. The elements are moved axially as they are wound or placed on a shaping form while the sealant is still pliable to shape the element.Type: GrantFiled: April 26, 1996Date of Patent: May 11, 1999Assignee: Donaldson Company, Inc.Inventors: Joseph C. Tokar, Gary R. Gillingham, Wayne M. Wagner, Daniel T. Risch, Jim C. Rothman, Fred H. Wahlquist, Edward A. Steinbrueck, Steven A. Carter
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Patent number: 5895574Abstract: A filter apparatus includes a fluted filter element in a filter housing having a first open end and a second closed end. The filter element includes fluted filter media coiled into a cylindrical shape and may include an end cap for support and fluid control. Fluid flows into the open end and either around the filter to the closed and back through the filter element or through the filter element to the closed end and then back through a central opening in the filter element.Type: GrantFiled: April 26, 1996Date of Patent: April 20, 1999Assignee: Donaldson Company, Inc.Inventors: Francis A. Friedmann, Gary R. Gillingham, Bernard A. Matthys, Daniel T. Risch, Wayne M. Wagner, Fred H. Wahlquist
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Patent number: 5820646Abstract: A filter device inserts into a duct having flow passing from upstream to downstream. The filter device includes fluted filter media having flutes formed therein. The filter forms a seal between the outer edge of the filter and the downstream side of the duct. The filter media may be rolled or stacked in layers to match the shape of the duct.Type: GrantFiled: April 26, 1996Date of Patent: October 13, 1998Assignee: Donaldson Company, Inc.Inventors: Gary R. Gillingham, Wayne M. Wagner, Joseph C. Tokar, Daniel T. Risch, Jim C. Rothman, Fred H. Wahlquist
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Patent number: 5772883Abstract: A filter device inserts into a duct having flow passing from upstream to downstream. The filter device includes fluted filter media having flutes formed therein inserting into a housing. The filter media is stacked and placed at an angle to the prevailing flow direction.Type: GrantFiled: April 26, 1996Date of Patent: June 30, 1998Assignee: Donaldson Company, Inc.Inventors: Jim C. Rothman, Gary R. Gillingham, Wayne M. Wagner, Joseph C. Tokar, Daniel T. Risch, Fred H. Wahlquist, Bernard A. Matthys
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Patent number: 5683479Abstract: An air cleaner construction including a precleaner arrangement, a filter assembly and a scavenger arrangement is provided. In the precleaner arrangement, air directed into the air cleaner assembly is subjected to some particulate removal. The air from the precleaner arrangement is then directed into the filter assembly, for further particulate material. The scavenger arrangement is constructed and arranged to scavenge separated particulate material from both the precleaner arrangement and the filter assembly. A pulse jet cleaner assembly is provided to facilitate removal of particulate material from the filter assembly.Type: GrantFiled: October 22, 1996Date of Patent: November 4, 1997Assignee: Donaldson Company, Inc.Inventors: Gary R. Gillingham, Peter A. Betts, Daniel T. Risch, James C. Rothman, Fred H. Wahlquist
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Patent number: 5575826Abstract: An air cleaner construction including a precleaner arrangement, a filter assembly and a scavenger arrangement is provided. In the precleaner arrangement, air directed into the air cleaner assembly is subjected to some particulate removal. The air from the precleaner arrangement is then directed into the filter assembly, for further particulate material. The scavenger arrangement is constructed and arranged to scavenge separated particulate material from both the precleaner arrangement and the filter assembly. A pulse jet cleaner assembly is provided to facilitate removal of particulate material from the filter assembly.Type: GrantFiled: March 28, 1995Date of Patent: November 19, 1996Assignee: Donaldson Company, Inc.Inventors: Gary R. Gillingham, Peter A. Betts, Daniel T. Risch, James C. Rothman, Fred H. Wahlquist
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Patent number: 5401285Abstract: An air cleaner construction including a precleaner arrangement, a filter assembly and a scavenger arrangement is provided. In the precleaner arrangement, air directed into the air cleaner assembly is subjected to some particulate removal. The air from the precleaner arrangement is then directed into the filter assembly, for further particulate material. The scavenger arrangement is constructed and arranged to scavenge separated particulate material from both the precleaner arrangement and the filter assembly. A pulse jet cleaner assembly is provided to facilitate removal of particulate material from the filter assembly.Type: GrantFiled: September 17, 1993Date of Patent: March 28, 1995Assignee: Donaldson Company, Inc.Inventors: Gary R. Gillingham, Peter A. Betts, Daniel T. Risch, James C. Rothman, Fred H. Wahlquist
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Patent number: 5116083Abstract: A clamp suitable for joining a pair of tubular members such as truck exhaust pipes including a metal band having a reinforcing bar at each end wrapped more than one turn, each wrapped reinforced end forming at least one hold for receiving, threading, and securing a set of bolts and nuts. The band is preferably formed from an aluminized steel, and the reinforcing bars may be non-plated. Embodiments using only the wrapped ends without reinforcing bars, folded rims, beading, and bolt-securing plates are also disclosed.Type: GrantFiled: April 9, 1990Date of Patent: May 26, 1992Assignee: Donaldson Company, Inc.Inventors: Gary R. Gillingham, Wayne M. Wagner, Fred H. Wahlquist
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Patent number: 4504293Abstract: An improved self-cleaning air filter (2) of the pulse jet type. The filter includes at least one filter element (20) located in a dirty air plenum (6) which is separated from a clean air plenum (8). A valve (64) directs a cleaning jet of gas that moves in a back flow direction along the filter element to remove accumulated contaminants therefrom. A diffuser is located in the clean air plenum for diffusing the cleaning jet of gas to convert the cleaning jet to a high volume, low pressure jet which substantially fills the entire cross-sectional area of the filter element. The filter element is releasably contained inside the dirty air plenum on elongated support members (36). Rotatable cams (44) are provided for laterally shifting the filter element to lock the filter element in place against a dividing wall (10).Type: GrantFiled: June 28, 1983Date of Patent: March 12, 1985Assignee: Donaldson Company, Inc.Inventors: Gary R. Gillingham, Fred H. Wahlquist, Bernard A. Matthys
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Patent number: 4452616Abstract: An improved selfcleaning air filter (2) of the pulse jet type. The filter includes at least one filter element (20) located in a dirty air plenum (6) which is separated from a clean air plenum (8) by a partition (10). A nozzle (70) directs a cleaning jet of gas that moves in a back flow direction along the filter element to remove accumulated contaminants therefrom. A diffuser is located in the clean air plenum for diffusing the cleaning jet of gas to convert the cleaning jet to a high volume, low pressure jet which substantially fills the entire cross-sectional area of the filter element at the element outlet.Type: GrantFiled: April 1, 1982Date of Patent: June 5, 1984Assignee: Donaldson Company, Inc.Inventors: Gary R. Gillingham, Fred H. Wahlquist