Patents by Inventor Carl Ferdinand Kurth

Carl Ferdinand Kurth 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).

  • Method and apparatus for interfacing digital and analog carrier systems
    Patent number: 4013842
    Abstract: Apparatus for interconnecting a time-division multiplex carrier system, such as T1, with a frequency-division multiplex carrier system, such as LMX-3. The interconnexion is effected in an all digital manner by the use of digital filters, thus avoiding the necessity of down-converting either system to voiceband.
    Type: Grant
    Filed: April 15, 1976
    Date of Patent: March 22, 1977
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Chih-Yu Kao, Carl Ferdinand Kurth
  • Monolithic crystal filter
    Patent number: 3944951
    Abstract: An improved monolithic crystal filter is disclosed. The filter has input and output ports formed from particular combinations of first, second and third terminals, the latter terminals having been adapted to be connected to certain preselected electrodes of the two adjacent resonators comprising the filter. More specifically, the first terminal is adapted to be connected to one of the electrodes of a first one of the aforesaid two resonators, the second terminal to the other electrode of the first resonator and to one of the electrodes of the second of the two resonators, and the third terminal to the remaining electrode of the second resonator.
    Type: Grant
    Filed: November 21, 1974
    Date of Patent: March 16, 1976
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Carl Ferdinand Kurth