Patents by Inventor David P. Langenfeld

David P. Langenfeld 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).

  • Patent number: 11980553
    Abstract: A prosthetic device. The prosthetic device may include a flexure cut and/or a sensor to detect movement in accordance with a degree of movement. In an embodiment, the sensor may be disposed within the flexure cut. Other embodiments include at least one wire configured to connect a sensor located in a distal portion to a proximal portion, while annularly traversing a joint.
    Type: Grant
    Filed: June 4, 2021
    Date of Patent: May 14, 2024
    Assignee: DEKA Products Limited Partnership
    Inventors: N. Christopher Perry, Keith D. Violette, Grant A. Peret, David D. B. Cannan, Christopher C. Langenfeld, Jacob P. Laplante, Thomas A. Doyon
  • Patent number: 5941320
    Abstract: An underground directional boring machine includes a frame and a drive mechanism slidably mounted on the frame. A drill string is coupled to the drive mechanism for rotation and longitudinal advancement and retraction. A drive assembly moves the drive mechanism along the frame. The drive assembly includes two hydraulic cylinders coupled to the drive mechanism and extending in opposite directions. Free ends of the hydraulic cylinders are releasably secured to the frame at any one of a plurality of positions along the length of the frame. Selective pressurization of the cylinders results in sequential movement of the drive mechanism along the frame by alternative extension and retraction of the cylinders.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: August 24, 1999
    Assignee: Vermeer Manufacturing Company
    Inventors: Gregg A. Austin, David P. Langenfeld, Peter C. Rozendaal
  • Patent number: 5556253
    Abstract: An automatic pipe loading device includes a magazine containing a plurality of pipes which are gravity fed through a discharge opening at a discharge end of the magazine. A pipe transfer member is mounted beneath the magazine and rotates between load and unload positions. In a load position, the pipe transfer mechanism presents a pocket in alignment with a discharge opening of the magazine. In all other positions, the pipe transfer mechanism presents a blocking surface preventing pipes from being discharged from the magazine. The pipe transfer member includes a pipe grip for grasping a pipe received within the receiving pocket and releasing the grasped pipe at a desired location.
    Type: Grant
    Filed: May 11, 1995
    Date of Patent: September 17, 1996
    Assignee: Vermeer Manufacturing Company
    Inventors: Peter C. Rozendaal, David P. Langenfeld