Patents by Inventor Andreas Kretschmer

Andreas Kretschmer 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).

  • Mechanical seal arrangement having sliding surfaces of different hardness
    Patent number: 9841107
    Abstract: The invention relates to a mechanical seal arrangement comprising: a rotating slide ring (2) having a first slide surface and a stationary slide ring (3) with a second slide surface which between them define a sealing gap 4, wherein the first and second slide surfaces have different hardnesses, wherein the harder slide surface has a diamond coating (20) and the softer slide surface is produced from carbon composite material, and wherein an average initial roughness Ra1 (of the diamond coating 20) is less than an average initial roughness Ra2 of the slide surface made from carbon composite material.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: December 12, 2017
    Assignee: EagleBurgmann Germany GmbH & Co. KG
    Inventors: Joachim Otschik, Andreas Kretschmer, Carsten Scholz, Rudolf Schicktanz, Andreas Schrufer
  • MECHANICAL SEAL ARRANGEMENT HAVING SLIDING SURFACES OF DIFFERENT HARDNESS
    Publication number: 20160053895
    Abstract: The invention relates to a mechanical seal arrangement comprising: a rotating slide ring (2) having a first slide surface and a stationary slide ring (3) with a second slide surface which between them define a sealing gap 4, wherein the first and second slide surfaces have different hardnesses, wherein the harder slide surface has a diamond coating (20) and the softer slide surface is produced from carbon composite material, and wherein an average initial roughness Ra1 (of the diamond coating 20) is less than an average initial roughness Ra2 of the slide surface made from carbon composite material.
    Type: Application
    Filed: March 11, 2014
    Publication date: February 25, 2016
    Applicant: EagleBurgmann Germany GmbH & Co. KG
    Inventors: Joachim Otschik, Andreas Kretschmer, Carsten Scholz, Rudolf Schicktanz, Andreas Schrufer