Patents by Inventor John J. Fronduto

John J. Fronduto 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).

  • Stably emitting demountable photoelectron generator
    Patent number: 4970392
    Abstract: A new method and apparatus for providing a stable, temporally controllable high current density electron beam from a photocathode has been developed. A low level of cesium and, possibly a stabilizing gas, is supplied to the photoemitting surface while the electron beam is being generated, thereby replenishing cesium and possibly other ions lost from the emitting surface on a continual basis.
    Type: Grant
    Filed: January 17, 1990
    Date of Patent: November 13, 1990
    Assignee: Thermo Electron Corporation
    Inventors: Peter E. Oettinger, Timothy D. Howard, John J. Fronduto
  • N-nitroso compound analyzer with sample atomization
    Patent number: 4066411
    Abstract: A liquid-gas interface is provided between a heated reaction chamber of an N-nitroso compound detection system and a liquid chromatograph. The liquid-gas interface atomizes liquid chromatograph effluent, including the N-nitroso compounds to be measured, with a stream of carrier gas, into the reaction chamber. In the heated reaction chamber, the effluent from the interface is vaporized. Condensation of non-volatile N-nitroso compounds is avoided by preheating the liquid effluent prior to atomization.
    Type: Grant
    Filed: January 19, 1977
    Date of Patent: January 3, 1978
    Assignee: Thermo Electron Corporation
    Inventors: David H. Fine, John J. Fronduto, David P. Rounbehler