Patents by Inventor David L. Ash
David L. Ash 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: 20240066518Abstract: Broad volumetric range pipettes with multi-tiered pipette tip holder and ejection assemblies and methods of using such pipettes are disclosed herein. These pipettes typically include a concentric cylinder arrangement with each outer cylinder configured for contacting and dislodging a pipette tip attached to the tip holder portion of the immediately adjacent inner cylinder. In this manner, different sized pipette tips can be used on a single device. In addition, a locking mechanism is described for locking the large tip holder into a downward position to minimize the extension of the small tip holder and thereby enabling attachment of large, filtered pipette tips and reducing/eliminating the risk that the liquid being transferred will contaminate the pipetting device.Type: ApplicationFiled: August 29, 2023Publication date: February 29, 2024Applicant: DeNovix Inc.Inventors: Benayah Ben-Avraham, Daniel Schieffer, David L. Ash, Fernando Frederick Kielhorn, David B. Ward
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Patent number: 11679383Abstract: Multivolume liquid pipettes with nested plunger and vacuum chamber configurations and methods of using such pipettes are disclosed herein. These pipettes typically include a body and a fluid displacement assembly with a small plunger element slideably received within a larger plunger element, each movable within a vacuum chamber for the precise and accurate control of the displacement of fluid, such as air. In turn, this allows for a single device to aspirate and dispense a broad range of liquids in a dynamic, accurate, and precise manner. In addition, the devices disclosed herein may also include a multi-tiered spring-loaded ejection mechanism to allow the user to use and eject pipette tips of different sizes.Type: GrantFiled: July 27, 2022Date of Patent: June 20, 2023Assignee: DeNovix, IncInventors: Daniel A. Schieffer, David L. Ash, David B. Ward
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Patent number: 11660592Abstract: Multivolume liquid pipettes with nested plunger and vacuum chamber configurations and methods of using such pipettes are disclosed herein. These pipettes typically include a body and a fluid displacement assembly with a small plunger element slideably received within a larger plunger element, each movable within a vacuum chamber for the precise and accurate control of the displacement of fluid, such as air. In turn, this allows for a single device to aspirate and dispense a broad range of liquids in a dynamic, accurate, and precise manner. In addition, the devices disclosed herein may also include a multi-tiered spring-loaded ejection mechanism to allow the user to use and eject pipette tips of different sizes.Type: GrantFiled: February 12, 2021Date of Patent: May 30, 2023Assignee: DeNovix, Inc.Inventors: Daniel A. Schieffer, David L. Ash, David B. Ward
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Publication number: 20220362759Abstract: Multivolume liquid pipettes with nested plunger and vacuum chamber configurations and methods of using such pipettes are disclosed herein. These pipettes typically include a body and a fluid displacement assembly with a small plunger element slideably received within a larger plunger element, each movable within a vacuum chamber for the precise and accurate control of the displacement of fluid, such as air. In turn, this allows for a single device to aspirate and dispense a broad range of liquids in a dynamic, accurate, and precise manner. In addition, the devices disclosed herein may also include a multi-tiered spring-loaded ejection mechanism to allow the user to use and eject pipette tips of different sizes.Type: ApplicationFiled: July 27, 2022Publication date: November 17, 2022Applicant: DENOVIX, INC.Inventors: Daniel A. Schieffer, David L. Ash, David B. Ward
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Publication number: 20210252496Abstract: Multivolume liquid pipettes with nested plunger and vacuum chamber configurations and methods of using such pipettes are disclosed herein. These pipettes typically include a body and a fluid displacement assembly with a small plunger element slideably received within a larger plunger element, each movable within a vacuum chamber for the precise and accurate control of the displacement of fluid, such as air. In turn, this allows for a single device to aspirate and dispense a broad range of liquids in a dynamic, accurate, and precise manner. In addition, the devices disclosed herein may also include a multi-tiered spring-loaded ejection mechanism to allow the user to use and eject pipette tips of different sizes.Type: ApplicationFiled: February 12, 2021Publication date: August 19, 2021Applicant: DENOVIX, INC.Inventors: Daniel A. SCHIEFFER, David L. Ash, David B. Ward
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Patent number: 10598598Abstract: Cell counters and methods of their use are disclosed herein. The cell counters include a sample mounting system that includes a base, which includes a mounted lower sample surface and a cover having a mounted upper sample surface; a bright-field light source incorporated in the cover; an objective lens mounted below the sample mounting system; optionally, a fluorescence excitation source in optical communication with the sample mounting system; and an imaging system in optical communication with the bright-field light source and the objective lens. The mounted sample surfaces are configured for repeated use, such that disposable sample cartridges are not needed.Type: GrantFiled: April 23, 2019Date of Patent: March 24, 2020Assignee: Denovix, Inc.Inventors: Fernando F. Kielhorn, Daniel A. Schieffer, David L. Ash, Kevin Kelley, Andrew William Jones
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Publication number: 20190310197Abstract: Cell counters and methods of their use are disclosed herein. The cell counters comprise a sample mounting system that includes a base comprising a mounted lower sample surface and a cover comprising a mounted upper sample surface; a bright-field light source incorporated in the cover; an objective lens mounted below the sample mounting system; optionally, a fluorescence excitation source in optical communication with the sample mounting system; and an imaging system in optical communication with the bright-field light source and the objective lens. The mounted sample surfaces are configured for repeated use, such that disposable sample cartridges are not needed.Type: ApplicationFiled: April 23, 2019Publication date: October 10, 2019Applicant: Denovix, Inc.Inventors: Fernando F. Kielhorn, Daniel A. Schieffer, David L. Ash, Kevin Kelley, Andrew William Jones
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Patent number: 10302568Abstract: Cell counters and methods of their use are disclosed herein. The cell counters comprise a sample mounting system that includes a base comprising a mounted lower sample surface and a cover comprising a mounted upper sample surface; a bright-field light source incorporated in the cover; an objective lens mounted below the sample mounting system; optionally, a fluorescence excitation source in optical communication with the sample mounting system; and an imaging system in optical communication with the bright-field light source and the objective lens. The mounted sample surfaces are configured for repeated use, such that disposable sample cartridges are not needed.Type: GrantFiled: June 20, 2017Date of Patent: May 28, 2019Assignee: Denovix, Inc.Inventors: Fernando F. Kielhorn, Daniel A. Schieffer, David L. Ash, Kevin Kelley
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Publication number: 20170370848Abstract: Cell counters and methods of their use are disclosed herein. The cell counters comprise a sample mounting system that includes a base comprising a mounted lower sample surface and a cover comprising a mounted upper sample surface; a bright-field light source incorporated in the cover; an objective lens mounted below the sample mounting system; optionally, a fluorescence excitation source in optical communication with the sample mounting system; and an imaging system in optical communication with the bright-field light source and the objective lens. The mounted sample surfaces are configured for repeated use, such that disposable sample cartridges are not needed.Type: ApplicationFiled: June 20, 2017Publication date: December 28, 2017Inventors: Fernando F. Kielhorn, Daniel A. Schieffer, David L. Ash, Kevin Kelley
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Publication number: 20160290866Abstract: An apparatus and method for measuring fluorescence of a sample is described. An apparatus includes three or more fluorescence channels passing through a sample site. The three or more fluorescence channels allow for exposing a sample at the sample site to light from three or more light sources, which results in fluorescence measurements based on emissions from the sample in response to the three or more light sources.Type: ApplicationFiled: March 30, 2016Publication date: October 6, 2016Inventors: Fernando F. Kielhorn, David B. Ward, David L. Ash
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Patent number: 6487979Abstract: A stowable shelf assembly for use in a vehicle. The shelf assembly has a shelf and a bracket. The shelf has a first flange and a brace member each extending outwardly from the shelf. The shelf is also movable between use and stowed positions. The bracket has a second flange and a support, each extending outwardly from the bracket. The first flange of the shelf is located between the second flange and the support. The first flange abuts the second flange, the shelf is carried by the support and the brace member is adjacent the bracket while the shelf is in the use position. Conversely, the first flange is spaced apart from the second flange, the shelf is spaced apart from the support and the brace member is spaced apart from the bracket while the shelf is in the stowed position.Type: GrantFiled: March 15, 2001Date of Patent: December 3, 2002Assignee: UtilimasterInventors: David L. Ash, John E. Knudtson, DeRay G. Steffensen, Gene A. Dylewski
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Patent number: 6398283Abstract: A vehicle having a movable cargo tray apparatus for the floor of the vehicle is provided. The apparatus having a base, bearing, a pair of longitudinally extending mounting rails, and at least one stop. The stop selectively engages the rail.Type: GrantFiled: July 21, 2000Date of Patent: June 4, 2002Assignee: Utilimaster CorporationInventors: John E. Knudtson, David L. Ash, DeRay G. Steffensen, Gene A. Dylewski, Nevin L. Martin, Jr.
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Publication number: 20010035114Abstract: A stowable shelf assembly for use in a vehicle. The shelf assembly has a shelf and a bracket. The shelf has a first flange and a brace member each extending outwardly from the shelf. The shelf is also movable between use and stowed positions. The bracket has a second flange and a support, each extending outwardly from the bracket. The first flange of the shelf is located between the second flange and the support. The first flange abuts the second flange, the shelf is carried by the support and the brace member is adjacent the bracket while the shelf is in the use position. Conversely, the first flange is spaced apart from the second flange, the shelf is spaced apart from the support and the brace member is spaced apart from the bracket while the shelf is in the stowed position.Type: ApplicationFiled: March 15, 2001Publication date: November 1, 2001Inventors: David L. Ash, John E. Knudtson, DeRay G. Steffensen, Gene A. Dylewski