Patents by Inventor Edward J. Zuperku

Edward J. Zuperku 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: 4899053
    Abstract: A non-dispersive infrared gas analyzer of the type typically used to measure concentrations of gases in medical and industrial applications has no moving parts and employs two or more miniature infrared sources ("microsources") which are electrical current-modulated to produce modulated infrared radiation for synchronous detection. The microsources are operated at different frequencies. The frequency-multiplexed detector signal is demodulated and ratioed to yield an output which is correlated to the gas concentration in the sampler chamber.
    Type: Grant
    Filed: October 21, 1987
    Date of Patent: February 6, 1990
    Assignee: Criticare Systems, Inc.
    Inventors: N. C. Joseph Lai, Edward J. Zuperku, Roy A. Henning