Patents by Inventor Dirk Krätzer

Dirk Krätzer 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).

  • HIFI AUDIO TUBE AMPLIFIER
    Publication number: 20170085227
    Abstract: A casing unit is provided that includes a cylindrical peripheral wall portion of quartz or glass, a cover of metal, and a fixing unit configured to fix the casing unit in or to a housing of a hi-fi tube amplifier. Also provided is a hi-fi audio tube amplifier that includes a plurality of tubes configured to amplify audio signals, and a plurality of the afore-mentioned casing units. Each casing unit encloses one tube of the plurality tubes at three sides, and the fixing unit of each casing unit is configured to fix the respective casing unit in or to a housing of the hi-fi audio tube amplifier.
    Type: Application
    Filed: September 16, 2016
    Publication date: March 23, 2017
    Applicant: Sennheiser electronic GmbH & Co. KG
    Inventors: Dirk Krätzer, Andre Grandt, Axel Grell, Alexander Grimm
  • Rechargeable battery unit and portable electronic appliance
    Patent number: 9184474
    Abstract: There is provided an accumulator unit for insertion into a portable electronic device. The accumulator unit has an integrated charging unit and a charging port. The charging port is freely accessible in the inserted and non-inserted condition of the accumulator unit.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: November 10, 2015
    Assignee: Sennheiser electronic GmbH & Co. KG
    Inventors: Dirk Reymann, Elmar Schulze, Niels Christian Steen Hansen, Dirk Krätzer
  • RECHARGEABLE BATTERY UNIT AND PORTABLE ELECTRONIC APPLIANCE
    Publication number: 20120062169
    Abstract: There is provided an accumulator unit for insertion into a portable electronic device. The accumulator unit has an integrated charging unit and a charging port. The charging port is freely accessible in the inserted and non-inserted condition of the accumulator unit.
    Type: Application
    Filed: November 20, 2009
    Publication date: March 15, 2012
    Inventors: Dirk Reymann, Elmar Schulze, Niels Christian Steen Hansen, Dirk Krätzer