Patents by Inventor Helmut Ewaldt

Helmut Ewaldt 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).

  • Printing method for disc-shaped information carriers
    Patent number: 5317337
    Abstract: Method and apparatus for printing label information in the form of graphics and/or characters on a disc-shaped information carrier (such as a CD). The label information is prepared by a data-processing system and transferred to a printer for processing. The printer then prints the label information directly on the information carrier.
    Type: Grant
    Filed: March 22, 1990
    Date of Patent: May 31, 1994
    Assignee: U.S. Philips Corporation
    Inventor: Helmut Ewaldt
  • Photosensitive semiconductor resistor
    Patent number: 4462019
    Abstract: A photosensitive semiconductor resistor has a monocrystalline semiconductor body of one conductivity type which, on two oppositely located surfaces, is provided with an anode contact and with a cathode contact, and is constructed so that the cathode contact is a highly doped zone of the same conductivity type as the semiconductor body. The semiconductor body can be exposed to photon radiation at its surface supporting the cathode contact and the area of the anode contact is at least 1000 times larger than the area of the cathode contact. Such a photosensitive semiconductor resistor is easy to manufacture and has both a low inertia and a good sensitivity.
    Type: Grant
    Filed: February 1, 1982
    Date of Patent: July 24, 1984
    Assignee: U.S. Philips Corporation
    Inventors: Helmut Ewaldt, Gerhard Raabe, Heinz Sauermann, Rainer Burmeister