Patents by Inventor Patrick S. Dillman
Patrick S. Dillman 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: 20240052818Abstract: A pump system includes a housing defining a first internal volume and a second internal volume, a first piston positioned to separate the first internal volume into a first chamber and a second chamber, a second piston positioned to separate the second internal volume into a third chamber and a fourth chamber, a first inlet check valve configured to permit fluid flow into the first chamber, a second inlet check valve configured to permit fluid flow into the third chamber, a directional control valve (DCV) repositionable between (a) a first position where the DCV is configured to fluidly couple the second chamber to a high pressure fluid source and (b) a second position where the DCV is configured to fluidly couple the fourth chamber to the high pressure fluid source, and a relief valve configured to supply a fluid to the DCV through an orifice to move the DCV.Type: ApplicationFiled: October 23, 2023Publication date: February 15, 2024Applicant: Oshkosh CorporationInventors: Kai P. Schubart, Christopher J. Rukas, Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Patent number: 11815078Abstract: A pump system includes a housing defining a first internal volume and a second internal volume, a first piston positioned to separate the first internal volume into a first chamber and a second chamber, a second piston positioned to separate the second internal volume into a third chamber and a fourth chamber, a directional control valve (DCV) fluidly coupled to the second chamber and the fourth chamber, a first relief valve fluidly coupled to the DCV via a first control line and the second chamber via a first sensing line, a first orifice positioned along the first sensing line, a second relief valve fluidly coupled to the DCV via a second control line and the fourth chamber via a second sensing line, and a second orifice positioned along the second sensing line.Type: GrantFiled: October 6, 2022Date of Patent: November 14, 2023Assignee: Oshkosh CorporationInventors: Kai P. Schubart, Christopher J. Rukas, Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Patent number: 11738615Abstract: A suspension element includes a main body having an internal volume, a tubular element extending at least partially within the main body, the main body and the tubular element each including a sidewall having an inner surface and an outer surface, a first piston assembly separating the internal volume of the main body into a first chamber and a second chamber, the second chamber defined by the outer surface of the tubular element, the inner surface of the main body, and a surface of the first piston assembly, and a second piston assembly including a side that is directly exposed to the first chamber. The sidewall of the main body defines an aperture therethrough that forms a portion of a flow path between the first chamber and the second chamber. The first piston assembly is configured to prevent direct fluid communication between the first chamber and the second chamber.Type: GrantFiled: April 12, 2021Date of Patent: August 29, 2023Assignee: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Robert K. Sollenskog, Erik Ellifson, Aaron J. Rositch
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Patent number: 11732772Abstract: The damper assembly includes a tubular member, a rod, a primary piston, a secondary piston, and a resilient member. The tubular member includes a sidewall and a cap positioned at an end of the sidewall. The sidewall and the cap define an inner volume. The sidewall includes a shoulder separating the tubular member into a first portion and a second portion. The resilient member is disposed between the secondary piston and the cap and thereby is positioned to bias the secondary piston into engagement with the shoulder.Type: GrantFiled: March 3, 2022Date of Patent: August 22, 2023Assignee: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Patent number: 11685219Abstract: A damper assembly for a vehicle suspension system includes a first damper and a second damper. The second damper includes a housing including a wall that defines an aperture, the wall and the first damper at least partially defining a chamber. The second damper also includes a piston positioned within the chamber, a conduit defining a flow path that includes the aperture, and a flow control device disposed along the flow path. The second damper is configured to provide a damping force that varies based on the position of the piston within the chamber.Type: GrantFiled: September 1, 2021Date of Patent: June 27, 2023Assignee: Oshkosh Defense, LLCInventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger, Aaron J. Rositch, Robert K. Sollenskog
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Patent number: 11649874Abstract: The damper assembly includes a tubular member, a rod, a primary piston, a secondary piston, and a resilient member. The tubular member includes a sidewall and a cap positioned at an end of the sidewall. The sidewall and the cap define an inner volume. The sidewall includes a shoulder separating the tubular member into a first portion and a second portion. The resilient member is disposed between the secondary piston and the cap and thereby is positioned to bias the secondary piston into engagement with the shoulder.Type: GrantFiled: February 21, 2022Date of Patent: May 16, 2023Assignee: Oskhosh Defense, LLCInventors: Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Publication number: 20230046193Abstract: A pump system includes a housing defining a first internal volume and a second internal volume, a first piston positioned to separate the first internal volume into a first chamber and a second chamber, a second piston positioned to separate the second internal volume into a third chamber and a fourth chamber, a directional control valve (DCV) fluidly coupled to the second chamber and the fourth chamber, a first relief valve fluidly coupled to the DCV via a first control line and the second chamber via a first sensing line, a first orifice positioned along the first sensing line, a second relief valve fluidly coupled to the DCV via a second control line and the fourth chamber via a second sensing line, and a second orifice positioned along the second sensing line.Type: ApplicationFiled: October 6, 2022Publication date: February 16, 2023Applicant: Oshkosh CorporationInventors: Kai P. Schubart, Christopher J. Rukas, Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Patent number: 11480165Abstract: A pump system includes a pump assembly and a pump controller. The pump assembly includes a housing defining a first volume and a second volume separated by a divider, a first piston dividing the first volume into a first chamber and a second chamber, a second piston dividing the second volume into a third chamber and a fourth chamber, and a piston rod coupling the first piston and the second piston such that a movement of the first piston causes an equal movement of the second piston. The pump controller is configured to alternately supply a first fluid to the second chamber and the fourth chamber to cause the first piston and the second piston to reciprocate within the housing.Type: GrantFiled: September 19, 2019Date of Patent: October 25, 2022Assignee: Oshkosh CorporationInventors: Kai P. Schubart, Christopher J. Rukas, Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Publication number: 20220307567Abstract: The damper assembly includes a tubular member, a rod, a primary piston, a secondary piston, and a resilient member. The tubular member includes a sidewall and a cap positioned at an end of the sidewall. The sidewall and the cap define an inner volume. The sidewall includes a shoulder separating the tubular member into a first portion and a second portion. The resilient member is disposed between the secondary piston and the cap and thereby is positioned to bias the secondary piston into engagement with the shoulder.Type: ApplicationFiled: March 3, 2022Publication date: September 29, 2022Applicant: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Publication number: 20220170528Abstract: The damper assembly includes a tubular member, a rod, a primary piston, a secondary piston, and a resilient member. The tubular member includes a sidewall and a cap positioned at an end of the sidewall. The sidewall and the cap define an inner volume. The sidewall includes a shoulder separating the tubular member into a first portion and a second portion. The resilient member is disposed between the secondary piston and the cap and thereby is positioned to bias the secondary piston into engagement with the shoulder.Type: ApplicationFiled: February 21, 2022Publication date: June 2, 2022Applicant: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Patent number: 11293514Abstract: The damper assembly includes a tubular member, a rod, a primary piston, a secondary piston, and a resilient member. The tubular member includes a sidewall and a cap positioned at an end of the sidewall. The sidewall and the cap define an inner volume. The sidewall includes a shoulder separating the tubular member into a first portion and a second portion. The resilient member is disposed between the secondary piston and the cap and thereby is positioned to bias the secondary piston into engagement with the shoulder.Type: GrantFiled: June 28, 2019Date of Patent: April 5, 2022Assignee: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Patent number: 11255401Abstract: The damper assembly includes a tubular member, a rod, a primary piston, a secondary piston, and a resilient member. The tubular member includes a sidewall and a cap positioned at an end of the sidewall. The sidewall and the cap define an inner volume. The sidewall includes a shoulder separating the tubular member into a first portion and a second portion. The resilient member is disposed between the secondary piston and the cap and thereby is positioned to bias the secondary piston into engagement with the shoulder.Type: GrantFiled: April 2, 2020Date of Patent: February 22, 2022Assignee: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Publication number: 20210394578Abstract: A damper assembly for a vehicle suspension system includes a first damper and a second damper. The second damper includes a housing including a wall that defines an aperture, the wall and the first damper at least partially defining a chamber. The second damper also includes a piston positioned within the chamber, a conduit defining a flow path that includes the aperture, and a flow control device disposed along the flow path. The second damper is configured to provide a damping force that varies based on the position of the piston within the chamber.Type: ApplicationFiled: September 1, 2021Publication date: December 23, 2021Applicant: Oshkosh Defense, LLCInventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger, Aaron J. Rositch, Robert K. Sollenskog
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Patent number: 11135890Abstract: A damper assembly for a vehicle suspension system includes a first damper and a second damper. The second damper includes a housing having a wall that at least partially surrounds at least a portion of the first damper, the volume between the wall and the first damper defining a chamber, and the wall defines an aperture. The second damper also includes a piston positioned within the chamber, a conduit defining a flow path that includes the aperture, and a flow control device disposed along the flow path. The second damper is configured to provide a damping force that varies based on the position of the piston within the chamber.Type: GrantFiled: July 15, 2019Date of Patent: October 5, 2021Assignee: Oshkosh Defense, LLCInventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger, Aaron J. Rositch, Robert K. Sollenskog
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Publication number: 20210229515Abstract: A suspension element includes a main body having an internal volume, a tubular element extending at least partially within the main body, the main body and the tubular element each including a sidewall having an inner surface and an outer surface, a first piston assembly separating the internal volume of the main body into a first chamber and a second chamber, the second chamber defined by the outer surface of the tubular element, the inner surface of the main body, and a surface of the first piston assembly, and a second piston assembly including a side that is directly exposed to the first chamber. The sidewall of the main body defines an aperture therethrough that forms a portion of a flow path between the first chamber and the second chamber. The first piston assembly is configured to prevent direct fluid communication between the first chamber and the second chamber.Type: ApplicationFiled: April 12, 2021Publication date: July 29, 2021Applicant: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Robert K. Sollenskog, Erik Ellifson, Aaron J. Rositch
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Patent number: 10974561Abstract: A suspension element includes a main body having an internal volume configured to contain a liquid therein, a tubular element extending at least partially within the main body, the tubular element having an internal volume that defines a first fluid chamber configured to contain a compressible gas therein, a first piston separating the internal volume of the main body into a second fluid chamber and a third fluid chamber, a second piston positioned to separate the first fluid chamber from the second fluid chamber, and a flow control element disposed along a flow path between the second fluid chamber and the third fluid chamber. Movement of the tubular element generates a flow of the liquid through the flow control element to produce a damping force and changes the pressure of the compressible gas to produce a spring force.Type: GrantFiled: June 24, 2019Date of Patent: April 13, 2021Assignee: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Robert K. Sollenskog, Erik Ellifson, Aaron J. Rositch
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Publication number: 20210088036Abstract: A pump system includes a pump assembly and a pump controller. The pump assembly includes a housing defining a first volume and a second volume separated by a divider, a first piston dividing the first volume into a first chamber and a second chamber, a second piston dividing the second volume into a third chamber and a fourth chamber, and a piston rod coupling the first piston and the second piston such that a movement of the first piston causes an equal movement of the second piston. The pump controller is configured to alternately supply a first fluid to the second chamber and the fourth chamber to cause the first piston and the second piston to reciprocate within the housing.Type: ApplicationFiled: September 19, 2019Publication date: March 25, 2021Applicant: Oshkosh CorporationInventors: Kai P. Schubart, Christopher J. Rukas, Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Publication number: 20200232533Abstract: The damper assembly includes a tubular member, a rod, a primary piston, a secondary piston, and a resilient member. The tubular member includes a sidewall and a cap positioned at an end of the sidewall. The sidewall and the cap define an inner volume. The sidewall includes a shoulder separating the tubular member into a first portion and a second portion. The resilient member is disposed between the secondary piston and the cap and thereby is positioned to bias the secondary piston into engagement with the shoulder.Type: ApplicationFiled: April 2, 2020Publication date: July 23, 2020Applicant: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Patent number: 10619696Abstract: The damper assembly includes a tubular member, a rod, a primary piston, a secondary piston, and a resilient member. The tubular member includes a sidewall and a cap positioned at an end of the sidewall. The sidewall and the cap define an inner volume. The sidewall includes a shoulder separating the tubular member into a first portion and a second portion. The resilient member is disposed between the secondary piston and the cap and thereby is positioned to bias the secondary piston into engagement with the shoulder.Type: GrantFiled: July 20, 2018Date of Patent: April 14, 2020Assignee: Oshkosh Defense, LLCInventors: Patrick S. Dillman, Erik S. Ellifson, Aaron J. Rositch
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Publication number: 20190337350Abstract: A damper assembly for a vehicle suspension system includes a first damper and a second damper. The second damper includes a housing having a wall that at least partially surrounds at least a portion of the first damper, the volume between the wall and the first damper defining a chamber, and the wall defines an aperture. The second damper also includes a piston positioned within the chamber, a conduit defining a flow path that includes the aperture, and a flow control device disposed along the flow path. The second damper is configured to provide a damping force that varies based on the position of the piston within the chamber.Type: ApplicationFiled: July 15, 2019Publication date: November 7, 2019Applicant: Oshkosh Defense, LLCInventors: Erik S. Ellifson, Patrick S. Dillman, Jason J. Zuleger, Aaron J. Rositch, Robert K. Sollenskog