Patents by Inventor Frederick R. Pritchard

Frederick R. Pritchard 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: 4589274
    Abstract: Methods and apparatus are provided for continuously detecting and monitoring the hydrocarbon dew point of a gas. A sample of the gas stream whose dew point is to be monitored is heated and/or cooled prior to detection by a dew point detector. The cooling of a first portion of a sample may be accomplished by a second portion of the sample which is removed prior to the dew point detector and allowed to expand to cool the first portion of the sample. The sample is normally cooled until the presence of condensate is detected in the gas by the dew point detector whereupon the sample gas is heated to above the dew point and the procedure of cooling and heating the gas stream occurs in a continuous manner.
    Type: Grant
    Filed: August 29, 1984
    Date of Patent: May 20, 1986
    Assignee: Shell Oil Company
    Inventors: George J. Boyle, Frederick R. Pritchard
  • Patent number: 4034286
    Abstract: An apparatus for detecting a leak in an insulation system utilizing a plurality of sensing devices disposed in a grid-like arrangement in heat transfer relationship to the insulation. Each sensing device comprises a small enclosed chamber filled with an ion-conducting material that solidifies when subjected to the temperature produced by a leak in the insulation and changes conductivity. The conductivity of the sensing devices is monitored to detect leaks in the insulation.
    Type: Grant
    Filed: November 3, 1975
    Date of Patent: July 5, 1977
    Assignee: Shell Internationale Research Maatschappij B.V.
    Inventors: Yaacov Lev, Frederick R. Pritchard