Patents by Inventor Robert L. Derhaag

Robert L. Derhaag 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: 5777830
    Abstract: A belt-driven tape cartridge having more internal tape storage capacity than prior art cartridges adhering to a standard, but having the same outside dimensions as such a standard cartridge. The invention optimizes internal tape storage capacity in a approximately standard quarter inch cartridge by optimizing the geometric configuration and placement of internal tape guide rollers, repositioning internal side walls, and optimizing the size of the tape drive roller. Compared to the standard, the tape guide rollers are reduced in diameter and moved further away from the center line of the tape reels. Also in comparison to the standard, the side walls are also repositioned further away from the radial center of the tape reels. Optionally, the drive interface portion of the belt drive roller is decreased in size, while the required linear velocity of the tape is maintained by proportionally decreasing the radius of the belt interface portion of the belt drive roller.
    Type: Grant
    Filed: October 9, 1996
    Date of Patent: July 7, 1998
    Assignee: Gigatek Memory Systems
    Inventors: Andrew Wrobel, James A. Eggebeen, Robert L. Derhaag
  • Patent number: 4875233
    Abstract: A communication headset has an earpiece assembly mounted on one end of an arcuate headband having a single-piece integral, unitary construction and a resilient composition. The earpiece assembly includes an earmuff which engages a user's ear and which receives a speaker and speaker holder. The speaker holder is mounted rotatably to an interface module which in turn is mounted to a microphone module. An end cap engages the interface module and the microphone module. The mounting structure for attaching the microphone module to the interface module enables free rotational movement of the microphone module relative to the interface module about a central axis transverse to the interface module. A temple piece is disposed on the opposite end of the headband for engaging the user's temple.
    Type: Grant
    Filed: October 16, 1987
    Date of Patent: October 17, 1989
    Inventors: Robert L. Derhaag, David B. Rose
  • Patent number: D310368
    Type: Grant
    Filed: March 27, 1987
    Date of Patent: September 4, 1990
    Assignee: H.M. Electronics, Inc.
    Inventors: Robert L. Derhaag, Donald A. Kutz