Patents by Inventor Johann Gramberger

Johann Gramberger 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: 5105522
    Abstract: To make a friction ring which is intended to be used in clutches or brakes and has a sinter-bonded friction facing, an annular blank is blanked from flat sheet metal and is provided with a sinter-bonded friction facing. Thereafter the blank provided with the sintered friction facing is shaped to form a conical or cylindrical friction ring and grooves distributed around the periphery of the friction facing are embossed into the friction facing at the same time. In order to ensure that that shaping operation will result in an adequate dimensional accuracy, the operation to emboss the grooves into the friction facing is carried out in such a manner that the backing ring is similarly embossed.
    Type: Grant
    Filed: March 28, 1990
    Date of Patent: April 21, 1992
    Assignee: Miba Sintermetall Aktiengesellschaft
    Inventors: Johann Gramberger, Roitner Franz
  • Patent number: 4940847
    Abstract: In order to enable a friction ring comprising a supporting ring and a sintered friction lining to be produced without sintering the friction lining to an intermediate carrier, one initially forms a self-supporting moulded ring (7) from a compacted dry powder material (1), by pre-sintering or bonding using a bonding agent, whereafter the moulded ring is pressed into the supporting ring and the friction lining is produced by final sintering.
    Type: Grant
    Filed: February 18, 1988
    Date of Patent: July 10, 1990
    Assignees: ZWN Zahnradwerk Neuenstein GmbH, Miba Sinter
    Inventor: Johann Gramberger
  • Patent number: 4917743
    Abstract: In order to enable a friction ring comprising a supporting ring (2) and a sintered friction lining (4) to be produced without sintering the friction lining (4) to an intermediate carrier, one initially forms a self-supporting shaped strip (5) from a compacted dry powder material (1), by presintering or bonding using a bonding agent, whereafter the shaped strip (5) is pressed into the supporting ring (2) and the friction lining (4) is produced by final sintering.
    Type: Grant
    Filed: February 18, 1988
    Date of Patent: April 17, 1990
    Inventors: Johann Gramberger, Ferdinand Mairhofer