Patents by Inventor Alfred Seitz

Alfred Seitz 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).

  • Circuit arrangement for the pulsed illumination of a stroboscope ring
    Patent number: 4354142
    Abstract: A circuit arrangement for the pulsed illumination of a stroboscope ring of a record player is formed from a pulsating direct voltage by rectification, and the pulsating direct voltage is applied to a series connection of an ohmic resistor and a light emitting diode.
    Type: Grant
    Filed: July 21, 1980
    Date of Patent: October 12, 1982
    Assignee: U.S. Philips Corporation
    Inventor: Alfred Seitz
  • Multiple speed stroboscope device
    Patent number: 4225227
    Abstract: A stroboscope device for a record player for monitoring at least two speeds such as 331/3 and 45 r.p.m. A turntable rim may be provided with a single stroboscope pattern for the relevant speeds. As they pass a light pulse generator, the marks of the stroboscope pattern are optically comparable with light pulse trains produced by a light pulse generator at one of a plurality of frequencies obtained from a given or a-c mains frequency.
    Type: Grant
    Filed: October 24, 1978
    Date of Patent: September 30, 1980
    Assignee: U.S. Philips Corporation
    Inventor: Alfred Seitz