Patents by Inventor Andre P. De Haan

Andre P. De Haan 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).

  • Processes and apparatus for detecting the nature of combustion gases
    Patent number: 5248617
    Abstract: This invention relates to processes and apparatus for detecting the overall nature of combustion gases using a detector comprising a semi-conducting film of a metallic phthalocyanine which is deposited between two electrodes on an insulating wafer and which is placed in contact with the combustion gases and maintained at a temperature higher than a determined threshold, for example higher than 40.degree. C. for a monoclinic copper phthalocyanine, in order to render the phthalocyanine insensitive to the water vapour contained in the combustion gases.
    Type: Grant
    Filed: December 10, 1991
    Date of Patent: September 28, 1993
    Inventor: Andre P. De Haan