Patents by Inventor Alexander Telfer

Alexander Telfer 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).

  • Automated method and apparatus for determining total suspended solids in liquids
    Patent number: 4890484
    Abstract: The determination of total suspended solids (non-filterable residue) in water and waste water is automated to operate without operator intervention. Volatile total suspended solids can also be determined.
    Type: Grant
    Filed: January 28, 1988
    Date of Patent: January 2, 1990
    Assignee: Shell Oil Company
    Inventors: Alexander Telfer, Joseph C. Raia
  • Wide-range fluid level detector
    Patent number: 4870278
    Abstract: The range of a neutron backscatter fluid level detector is extended to provide essentially continuous level indication by interpolating neutron backscatter counts of neutrons supplied from a plurality of sources at various heights.
    Type: Grant
    Filed: June 8, 1988
    Date of Patent: September 26, 1989
    Assignee: Shell Oil Company
    Inventors: Anthony M. Leonardi-Cattolica, Dale H. McMillan, Alexander Telfer
  • Robotic liquid separation sensing using a cannula
    Patent number: 4829837
    Abstract: Robotic liquid separation operates independently of liquid volume, viscosity, or optical characteristics, by sensing changes in the dielectric constant of the liquid as it is being drawn through a cannula. The cannula has electrodes which form a sensing capacitor for detecting the changes in the liquid dielectric constant as the liquid is drawn therethrough.
    Type: Grant
    Filed: January 28, 1988
    Date of Patent: May 16, 1989
    Assignee: Shell Oil Company
    Inventor: Alexander Telfer
  • Liquid sensor for robotic filtration station
    Patent number: 4820425
    Abstract: A capacitance liquid sensor for a filtration station for a robotic liquid analyzer detects conclusion of the fluid filtration step by return of the capacitance in the station to its original value.
    Type: Grant
    Filed: January 28, 1988
    Date of Patent: April 11, 1989
    Assignee: Shell Oil Company
    Inventor: Alexander Telfer
  • Neutron interface detector
    Patent number: 4358682
    Abstract: A fixed neutron backscatter level detector for hydrogen containing liquids or solids. The detector comprises a source of fast neutrons and a thermal neutron detector disposed to measure thermal neutrons that are backscattered by the liquids or solids.
    Type: Grant
    Filed: July 7, 1980
    Date of Patent: November 9, 1982
    Assignee: Shell Oil Company
    Inventors: Alexander Telfer, Dale H. McMillan
  • Neutron interface detector
    Patent number: 4216376
    Abstract: An apparatus for measuring the level of a low mass element material in an enclosed vessel. The apparatus comprises a long probe having a source of fast neutrons and a detector of slow neutrons mounted at one end. The length of the probe ensures the safety of the operator and means are provided for remotely depositing the source in a shielded vessel so that it may be safely transported.
    Type: Grant
    Filed: June 22, 1978
    Date of Patent: August 5, 1980
    Assignee: Shell Oil Company
    Inventors: Leonard H. Griffin, Richard H. Hunt, Alexander Telfer