Patents by Inventor Carl R. Lehfeldt

Carl R. Lehfeldt 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: 5544315
    Abstract: A multimedia network system (10) for connection to a computer (12) and a computer network (28). Asynchronous transmission mode cells on the network (28) are processed by a network interface board (22) with synchronous signals routed to an ISOBUS (26) and asynchronous signals routed through a packet memory (54) to the computer (12). Asynchronous signals are routed through the ISOBUS (26) to a video board (24) and converted for output to one or more audio/video output devices (36). Signals originating at one or more audio/video input devices (34) are processed through the video board (24) and the network interface board (22) to the network (28).
    Type: Grant
    Filed: May 10, 1993
    Date of Patent: August 6, 1996
    Assignee: Communication Broadband Multimedia, Inc.
    Inventors: Carl R. Lehfeldt, Leonard P. Cygnapowicz
  • Patent number: 4754567
    Abstract: A double set trigger for a rifle is disclosed, consisting of a sear, a middle lever, a firing trigger, a set trigger, a catch for the set trigger, and a lever to sense the presence of the rifle bolt. The double set trigger has two springs, one for a light pull and one for a heavy pull. The force from the heavy pull spring is applied through the set trigger. The catch withholds the set trigger from the firing trigger for a light pull; the catch may be released by a second pull on the set trigger. The bolt sensing lever will release the set trigger if the bolt is withdrawn. A counterweight locates the center of gravity of the firing trigger concentric with the pivot point of the firing trigger.
    Type: Grant
    Filed: January 9, 1987
    Date of Patent: July 5, 1988
    Inventors: Carl R. Lehfeldt, Stuart V. Allen