Patents by Inventor Abraham William Berger

Abraham William Berger 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).

  • Sulfur detecting apparatus comprising holmium, and erbium filters
    Patent number: 4099883
    Abstract: An improvement in sulfur detecting apparatus is described wherein a filter system provides a signal path for light passing to detecting means, which signal path contains holmium and erbium, in quantities selected so that the optical transmission in the signal path is preponderantly in a wavelength interval 5 nm. wide and including the wavelength 374 nm. Embodiments of the invention additionally feature a calibration path for light passing to the light detecting means, containing samarium and holmium, the quantities of holmium and samarium being selected so that the optical transmission in the calibration path is preponderantly in a wavelenth interval 10 nm. wide and including the wavelength 374, the transmission being greater at wavelengths of 372 nm. and 378 nm. than at 374 nm. Further features includes a balanced transmission in the signal and calibration paths.
    Type: Grant
    Filed: February 7, 1977
    Date of Patent: July 11, 1978
    Inventors: Abraham William Berger, Harry Eugene Stubbs