Patents by Inventor Friedrich Schwabe

Friedrich Schwabe 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: 8402836
    Abstract: A pressure difference measuring cell for registering pressure difference between a first pressure and a second pressure, comprises: an elastic measuring arrangement having at least one measuring membrane, or diaphragm, that comprises silicon; a platform, which is pressure-tightly connected with the elastic measuring arrangement; a first hydraulic path for transferring a first pressure onto a first surface section of the elastic measuring arrangement; and a second hydraulic path for transferring a second pressure onto a second surface section of the elastic measuring arrangement. The first pressure opposes the second pressure, and the elastic deflection of the measuring arrangement is a measure for the difference between the first and the second pressure, wherein the pressure difference measuring cell has additionally at least one hydraulic throttle, characterized in that the at least one hydraulic throttle comprises porous silicon.
    Type: Grant
    Filed: December 12, 2008
    Date of Patent: March 26, 2013
    Assignee: Endress + Hauser GmbH + Co. KG
    Inventors: Wolfgang Dannhauer, Michael Philipps, Friedrich Schwabe, Dieter Stolze, Anh Tuan Tham
  • Publication number: 20100281992
    Abstract: A pressure difference measuring cell for registering pressure difference between a first pressure and a second pressure, comprises: an elastic measuring arrangement having at least one measuring membrane, or diaphragm, that comprises silicon; a platform, which is pressure-tightly connected with the elastic measuring arrangement; a first hydraulic path for transferring a first pressure onto a first surface section of the elastic measuring arrangement; and a second hydraulic path for transferring a second pressure onto a second surface section of the elastic measuring arrangement. The first pressure opposes the second pressure, and the elastic deflection of the measuring arrangement is a measure for the difference between the first and the second pressure, wherein the pressure difference measuring cell has additionally at least one hydraulic throttle, characterized in that the at least one hydraulic throttle comprises porous silicon.
    Type: Application
    Filed: December 12, 2008
    Publication date: November 11, 2010
    Applicant: Endress + Hauser GmbH + Co. KG
    Inventors: Wolfgang Dannhauer, Michael Philipps, Friedrich Schwabe, Dieter Stolze
  • Patent number: 6631644
    Abstract: A differential pressure pickup with a small hysteresis volume which has a sensor element, two pressure measuring chambers adjacent thereto, two pressure receiving chambers closed off by separating diaphragms and two overload chambers separated from each other by an overload diaphragm, in which pickup the overload diaphragm has a closed outer edge and a closed inner edge and is firmly restrained along its outer edge and its inner edge.
    Type: Grant
    Filed: June 11, 2001
    Date of Patent: October 14, 2003
    Assignee: Endress + Hauser GmbH + Co.
    Inventors: Dietfried Burczyk, Wolfgang Dannhauer, Frank Löffler, Ralf Nürnberger, Friedrich Schwabe
  • Publication number: 20020017143
    Abstract: A description is given of a differential pressure pickup with a small hysteresis volume which has a sensor element (1), two pressure measuring chambers (2, 3) adjacent thereto, two pressure receiving chambers (22, 32) closed off by separating diaphragms (21, 31) and two overload chambers (23, 33) separated from each other by an overload diaphragm (6), in which pickup the overload diaphragm (6) has a closed outer edge and a closed inner edge and is firmly restrained along its outer edge and its inner edge.
    Type: Application
    Filed: June 11, 2001
    Publication date: February 14, 2002
    Applicant: Endress + Hauser GmbH + Co.
    Inventors: Dietfried Burczyk, Wolfgang Dannhauer, Frank Loffler, Ralf Nurnberger, Friedrich Schwabe