Patents by Inventor David J. Hoffmann

David J. Hoffmann 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: 20080104902
    Abstract: A dock seal, such as a head seal mountable above a doorway of a loading dock, includes a compressible body with a support panel. The compressible body can conformably seal against the rear edge of a vehicle's enclosed trailer as the vehicle backs the trailer up against the seal. The support panel provides relatively dense structure for mounting the seal to the wall of a building. Compared to the horizontal distance that the compressible body projects from the wall, the support panel is ultra-thin to avoid consuming compressible space between the wall and the rear of the trailer. In some cases, a flexible panel suspends the compressible body and its support panel from the wall such that the flexible panel allows the dock seal to move relative to the wall.
    Type: Application
    Filed: November 7, 2006
    Publication date: May 8, 2008
    Applicant: RITE-HITE HOLDING CORPORATION
    Inventors: Charles J. Ashelin, David J. Hoffmann
  • Patent number: 7246467
    Abstract: A compressible seal for a loading dock includes a pliable heat shield that helps protect the seal from concentrated heat generated by a truck's taillight being pressed against the seal. The seal includes a compressible foam core protected by a tough outer covering. The heat shield is preferably placed against the foam core, just underneath the cover. The shield reflects heat away from the foam and helps disperse the heat over a broader area to reduce the peak temperature of any hot spots.
    Type: Grant
    Filed: April 13, 2000
    Date of Patent: July 24, 2007
    Assignee: Rite-Hite Holding Corporation
    Inventors: Jason D. Miller, David J. Hoffmann, Charles J. Ashelin
  • Publication number: 20040226228
    Abstract: A dock pad for a loading dock includes a heat shield that helps protect the pad from heat generated by an adjacent lamp. The heat shield overlays an exterior surface of the pad, and, in some cases, the heat shield includes a plurality of layers. The thermal conductivity may differ among the layers with one layer having greater thermal conductivity than the exterior surface of the pad and another layer having less thermal conductivity. In some cases, a screen or mesh creates an air gap between the layers.
    Type: Application
    Filed: May 16, 2003
    Publication date: November 18, 2004
    Inventors: Charles J. Digmann, David J. Hoffmann
  • Publication number: 20030177720
    Abstract: A sealing curtain for a loading dock includes a pliable heat shield that helps protect the sealing curtain from concentrated heat generated by a truck's taillight being pressed against the sealing curtain. The heat shield is preferably placed just underneath a sealing surface of the sealing curtain. The heat shield reflects heat away from an inner surface and disperses the heat over a broader area to reduce the peak temperature of any hot spots. The sealing curtain may be height adjustable to position the heat shield at various heights along the loading dock.
    Type: Application
    Filed: February 20, 2003
    Publication date: September 25, 2003
    Inventors: David J. Hoffmann, Charles J. Ashelin
  • Publication number: 20030140579
    Abstract: A sealing apparatus for forming a weather seal between a vehicle and a loading dock is provided. In some embodiments, the apparatus includes a roller seal rotatably mounted to a support for rotation about an axis. The roller seal is movable in at least a vertical direction from a first position in the path of a vehicle entering the parking area, to a second position wherein the roller seal is disposed adjacent the top of the vehicle. Preferably, a curtain is suspended distally of the roller seal such that, when the roller seal is in the second position, the curtain forms a first seal with the top of the vehicle and the roller seal forms a second seal with the top of the vehicle. The curtain is semi-rigid and, in some instances, defines a ramping surface to facilitate movement of the roller seal over the leading edge of a vehicle approaching the loading dock.
    Type: Application
    Filed: March 24, 2003
    Publication date: July 31, 2003
    Inventors: David J. Hoffmann, Charles J. Ashelin, Paul D. Rowlett
  • Patent number: 6550191
    Abstract: A sealing apparatus for forming a weather seal between a vehicle and a loading dock is provided. In some embodiments, the apparatus includes a roller seal rotatably mounted to a support for rotation about an axis. The roller seal is movable in at least a vertical direction from a first position in the path of a vehicle entering the parking area, to a second position wherein the roller seal is disposed adjacent the top of the vehicle. Preferably, a curtain is suspended distally of the roller seal such that, when the roller seal is in the second position, the curtain forms a first seal with the top of the vehicle and the roller seal forms a second seal with the top of the vehicle. The curtain is semi-rigid and, in some instances, defines a ramping surface to facilitate movement of the roller seal over the leading edge of a vehicle approaching the loading dock.
    Type: Grant
    Filed: January 9, 2001
    Date of Patent: April 22, 2003
    Assignee: Rite-Hite Holding Corporation
    Inventors: David J. Hoffmann, Charles J. Ashelin, Paul D. Rowlett
  • Publication number: 20010018813
    Abstract: A sealing apparatus for forming a weather seal between a vehicle and a loading dock is provided. In some embodiments, the apparatus includes a compressible seal and a support mounted for pivoting away from the top of an adjacent vehicle to facilitate exiting. In some embodiments, a stiffening member is located proximally to the seal to provide a compression force between the seal and the top of the vehicle. In other embodiments, the apparatus includes a deflectable seal and a locator including a distal recess for engaging the leading edge of a vehicle entering the parking area.
    Type: Application
    Filed: March 8, 2001
    Publication date: September 6, 2001
    Applicant: Rite-Hite Holding Corporation
    Inventors: Charles J. Ashelin, Thomas J. Boffeli, David J. Hoffmann
  • Publication number: 20010004814
    Abstract: A sealing apparatus for forming a weather seal between a vehicle and a loading dock is provided. In some embodiments, the apparatus includes a roller seal rotatably mounted to a support for rotation about an axis. The roller seal is movable in at least a vertical direction from a first position in the path of a vehicle entering the parking area, to a second position wherein the roller seal is disposed adjacent the top of the vehicle. Preferably, a curtain is suspended distally of the roller seal such that, when the roller seal is in the second position, the curtain forms a first seal with the top of the vehicle and the roller seal forms a second seal with the top of the vehicle. The curtain is semi-rigid and, in some instances, defines a ramping surface to facilitate movement of the roller seal over the leading edge of a vehicle approaching the loading dock.
    Type: Application
    Filed: January 9, 2001
    Publication date: June 28, 2001
    Applicant: RITE-HITE HOLDING CORPORATION
    Inventors: David J. Hoffmann, Charles J. Ashelin, Paul D. Rowlett
  • Patent number: 6233885
    Abstract: A sealing apparatus for forming a weather seal between a vehicle and a loading dock is provided. In some embodiments, the apparatus includes a roller seal rotatably mounted to a support for rotation about an axis. The roller seal is movable in at least a vertical direction from a first position in the path of a vehicle entering the parking area, to a second position wherein the roller seal is disposed adjacent the top of the vehicle. Preferably, a curtain is suspended distally of the roller seal such that, when the roller seal is in the second position, the curtain forms a first seal with the top of the vehicle and the roller seal forms a second seal with the top of the vehicle. The curtain is semi-rigid and, in some instances, defines a ramping surface to facilitate movement of the roller seal over the leading edge of a vehicle approaching the loading dock.
    Type: Grant
    Filed: February 24, 1998
    Date of Patent: May 22, 2001
    Assignee: Rite-Hite Holding Corporation
    Inventors: David J. Hoffmann, Charles J. Ashelin, Paul D. Rowlett
  • Patent number: 6205721
    Abstract: A sealing apparatus for forming a weather seal between a vehicle and a loading dock is provided. In some embodiments, the apparatus includes a compressible seal and a support mounted for pivoting away from the top of an adjacent vehicle to facilitate exiting. In some embodiments, a stiffening member is located proximally to the seal to provide a compression force between the seal and the top of the vehicle. In other embodiments, the apparatus includes a deflectable seal and a locator including a distal recess for engaging the leading edge of a vehicle entering the parking area.
    Type: Grant
    Filed: December 9, 1997
    Date of Patent: March 27, 2001
    Assignee: Rite-Hite Holding Corporation
    Inventors: Charles J. Ashelin, Thomas J. Boffeli, David J. Hoffmann
  • Patent number: 5622016
    Abstract: A seal assembly, which minimizes or eliminates infiltration of rain water along the roof of a truck parked in a loading dock, generally comprises a downwardly inclined roof panel which extends outwardly from the building wall and collects the water. A gutter member, supported by and disposed along the length of the roof panel, collects water runoff from the building walls and the roof panel and channels the water away from the center of the door opening and towards either side of the loading dock opening. The seal assembly also comprises a seal member mounted to the roof panel and/or the gutter member so that it generally hangs into the upper portion of the door opening and engages the top portion of the truck so as to sealably engage the truck roof and form a water blocking barrier, thereby minimizing or eliminating infiltration of rain water along the truck roof.
    Type: Grant
    Filed: October 7, 1993
    Date of Patent: April 22, 1997
    Assignee: Rite-Hite Corporation
    Inventors: Robert J. Frommelt, William Triervieler, David J. Hoffmann, Kenneth F. Lenz, Thomas J. Medley, Thomas J. Boffeli
  • Patent number: 5606854
    Abstract: An exhaust filter (10) removes pollutants from exhaust emitted by an internal combustion engine without producing substantial back pressure on the engine. The exhaust filter (10) is assembled from a frame (16), a mounting sleeve (14), and a replaceable filter cartridge (12). A series of baffles (40, 42, 44, 46, 48, and 50) are located along an exhaust passageway (84) within the cartridge (12) for diverting a first portion (88) of a flow of exhaust (80) through a filter media (78). An outlet (86) passes a second portion (90) of the flow of exhaust (80) from the exhaust filter (10) independently of the filter media (78).
    Type: Grant
    Filed: April 20, 1995
    Date of Patent: March 4, 1997
    Assignee: Air Filter Plus Inc.
    Inventor: David J. Hoffmann
  • Patent number: 5394662
    Abstract: A loading dock shelter having a resilient and flexible seal assembly is provided for forming a substantially air-tight seal between the dock opening and the truck. The seal assembly comprises a support or panel member which is adapted to attach to the loading dock frame and to support a seal member. The seal member has a substantially hook-shaped cross-section adapted to hookedly engage the incoming truck and is capable of resiliently flexing between a hook-shaped cross-section in the disengaged position and a substantially straight cross-section in the sealing position in response to the truck. The hook-shaped cross section permits the seal member to sealably engage the interior wall of the truck, and, in the alternative, will seal against the peripheral edge of the truck, or the exterior wall of the truck depending on the size and position of the truck.
    Type: Grant
    Filed: June 17, 1993
    Date of Patent: March 7, 1995
    Assignee: Rite-Hite Corporation
    Inventors: Jon Giuliani, William Triervieler, David J. Hoffmann, Thomas J. Boffeli, Thomas J. Medley, Robert Frommelt, Kenneth Lenz, Thomas E. Duccini