Patents by Inventor David L. Schaeffer

David L. Schaeffer 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).

  • Publication number: 20240091679
    Abstract: A process for the preparation of a concentrated filter cake from an admixture of partially-decomposed organic material and a polar liquid using a filter press without the input of thermal heat or superheated steam or other pressurized gas or liquid is provided by this invention. The admixture is mixed with an additional amount of the polar liquid to produce a feed slurry of the admixture having a moisture content of about 90-99% wt. The resulting slurry admixture is then introduced into the filter press having a plurality of filter plates with porous membranes secured along their outlet. The pressure condition introduced inside the filter plate chambers is increased by a pressurized gas or liquid to force the polar liquid from the admixture slurry though apertures contained in the membrane, thereby leaving a filter cake of the partially-decomposed organic material having a moisture content that is lower than the moisture content of the initial partially-decomposed organic material feed.
    Type: Application
    Filed: September 15, 2022
    Publication date: March 21, 2024
    Inventors: Douglas A. Green, David L. Schaeffer
  • Publication number: 20240091678
    Abstract: A process for the preparation of a concentrated filter cake from an admixture of partially-decomposed organic material and a polar liquid using a filter press without the input of thermal heat or superheated steam or other pressurized gas or liquid is provided by this invention. The admixture is mixed with an additional amount of the polar liquid to produce a feed slurry of the admixture having a moisture content of about 90-99% wt. The resulting slurry admixture is then introduced into the filter press having a plurality of filter plates with porous membranes secured along their outlet. The pressure condition introduced inside the filter plate chambers is increased by a pressurized gas or liquid to force the polar liquid from the admixture slurry though apertures contained in the membrane, thereby leaving a filter cake of the partially-decomposed organic material having a moisture content that is lower than the moisture content of the initial partially-decomposed organic material feed.
    Type: Application
    Filed: September 14, 2023
    Publication date: March 21, 2024
    Inventors: Douglas A. Green, David L. Schaeffer
  • Patent number: 11891141
    Abstract: A knuckle for a heavy-duty vehicle self-steering axle/suspension system that includes integrally formed structure for mounting components of a drum brake system. The knuckle includes a spindle that is welded directly to the knuckle and a discrete tie rod arm bolted to the knuckle.
    Type: Grant
    Filed: November 18, 2021
    Date of Patent: February 6, 2024
    Assignee: Hendrickson USA, L.L.C.
    Inventors: Jay D. White, David L. Schaeffer, Dhawal P. Dharaiya
  • Patent number: 11746846
    Abstract: A slack adjuster assembly for use with a heavy-duty vehicle drum brake system, the slack adjuster assembly comprising a slack adjuster, a cam tube assembly, and an interlock assembly. The interlock assembly is disposed on an outboard side of the slack adjuster and interconnects the cam tube assembly with the slack adjuster. A component of the interlock assembly and a component of the cam tube assembly cooperate to form a rotation reference mechanism for indexing of an automatic adjustment mechanism of the slack adjuster. The slack adjuster assembly further comprising an inboard sealing assembly and an outboard sealing assembly engaging respective inboard and outboard sides of the slack adjuster to form respective 360-degree interfaces. The cam tube assembly, interlock assembly, and inboard and outboard sealing assemblies forming a continuous grease pathway between the cam tube assembly and the slack adjuster.
    Type: Grant
    Filed: August 11, 2021
    Date of Patent: September 5, 2023
    Assignee: Hendrickson USA, L.L.C.
    Inventors: Jeffrey R. Wittlinger, Jay D. White, Dhawal P. Dharaiya, David L. Schaeffer, Wyatt R. Weekley
  • Publication number: 20230243394
    Abstract: A slack adjuster assembly for use with a heavy-duty vehicle drum brake system, the slack adjuster assembly comprising a slack adjuster, a cam tube assembly, and an inboard sealing assembly and an outboard sealing assembly. The outboard sealing assembly includes a tubular sealing ring having an L-shaped projection extending radially-inward. The inboard sealing assembly engages an inboard side of the slack adjuster to form a 360-degree interface, and the outboard sealing assembly engages an outboard side of the slack adjuster to form another 360-degree interface. The L-shaped projection limits grease being purged from the cam tube assembly.
    Type: Application
    Filed: April 11, 2023
    Publication date: August 3, 2023
    Inventors: Jeffrey R. Wittlinger, Jay D. White, Dhawal P. Dharaiya, David L. Schaeffer, Wyatt R. Weekley
  • Publication number: 20230088211
    Abstract: A slack adjuster assembly for heavy-duty vehicles, the slack adjuster assembly comprising a slack adjuster and an inboard sealing assembly. The slack adjuster is disposed about and has an internal spline for receiving an external spline of an inboard end of a camshaft of a camshaft assembly of the heavy-duty vehicle. The internal spline has a radial clearance from the external spline. The inboard sealing assembly includes mechanical components that cooperate with the radial clearance to increase grease flow and distribution. The inboard sealing assembly is disposed over the inboard end of the camshaft and engages an inboard side of the slack adjuster to form a 360-degree seal about the inboard side.
    Type: Application
    Filed: September 13, 2022
    Publication date: March 23, 2023
    Inventors: Jay D. White, David L. Schaeffer, Dhawal P. Dharaiya, Wyatt R. Weekly
  • Publication number: 20220185369
    Abstract: A knuckle for a heavy-duty vehicle self-steering axle/suspension system that includes integrally formed structure for mounting components of a drum brake system. The knuckle includes a spindle that is welded directly to the knuckle and a discrete tie rod arm bolted to the knuckle.
    Type: Application
    Filed: November 18, 2021
    Publication date: June 16, 2022
    Inventors: Jay D. White, David L. Schaeffer, Dhawal P. Dharaiya
  • Publication number: 20220065317
    Abstract: A slack adjuster assembly for use with a heavy-duty vehicle drum brake system, the slack adjuster assembly comprising a slack adjuster, a cam tube assembly, and an interlock assembly. The interlock assembly is disposed on an outboard side of the slack adjuster and interconnects the cam tube assembly with the slack adjuster. A component of the interlock assembly and a component of the cam tube assembly cooperate to form a rotation reference mechanism for indexing of an automatic adjustment mechanism of the slack adjuster. The slack adjuster assembly further comprising an inboard sealing assembly and an outboard sealing assembly engaging respective inboard and outboard sides of the slack adjuster to form respective 360-degree interfaces. The cam tube assembly, interlock assembly, and inboard and outboard sealing assemblies forming a continuous grease pathway between the cam tube assembly and the slack adjuster.
    Type: Application
    Filed: August 11, 2021
    Publication date: March 3, 2022
    Inventors: Jeffrey R. Wittlinger, Jay D. White, Dhawal P. Dharaiya, David L. Schaeffer
  • Patent number: 10072214
    Abstract: A process for the preparation of a concentrated filter cake from an admixture of partially-decomposed organic material and a polar liquid using a filter press without the input of thermal heat or superheated steam or other pressurized gas or liquid is provided by this invention. The admixture is mixed with an additional amount of the polar liquid to produce a feed slurry of the admixture having a moisture content of about 90-99% wt. The resulting slurry admixture is then introduced into the filter press having a plurality of filter plates with porous membranes secured along their outlet. The pressure condition introduced inside the filter plate chambers is increased by a pressurized gas or liquid to force the polar liquid from the admixture slurry though apertures contained in the membrane, thereby leaving a filter cake of the partially-decomposed organic material having a moisture content that is lower than the moisture content of the initial partially-decomposed organic material feed.
    Type: Grant
    Filed: February 15, 2017
    Date of Patent: September 11, 2018
    Assignee: American Peat Technology, LLC
    Inventors: Douglas A. Green, Gabriel A. Browning, David L. Schaeffer