Patents by Inventor John W. Stairmand

John W. Stairmand 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: 4913814
    Abstract: In apparatus for mixing and then separating different flow streams, such as solvent extraction apparatus, a cascade of contactors and jet pumps are arranged in counter-current flow mode. The same one flow stream is applied to the drive port of each jet pump in the cascade and the other flow stream is applied to the suction port of each jet pump in the cascade. The jet pumps in the cascade increase in size from a high pressure to a low pressure end of the cascade so that the suction pressure required at successive jet pumps is reduced.
    Type: Grant
    Filed: February 10, 1989
    Date of Patent: April 3, 1990
    Assignee: Secretary of State for United Kingdom Atomic Energy Authority
    Inventors: Jaswant Singh, John W. Stairmand
  • Patent number: 4682887
    Abstract: The viability of a pack of stored blood platelets is monitored by gripping the pack between two plates (6) and (7) which are closed to pinch together the walls of the bag (10) along an L-shaped seal (14), leaving a channel (17), squeezing a part (15) of the bag by means of a reciprocating plunger (19), so that the platelets continually flow to and fro between the part (15) and the part (16), through the channel (17), and passing a beam of light from an LED (27) through the channel (17), to a photoresistor (29). The AC signal from the photoresistor corresponds to the fluctuations in the intensity of the light passing through the channel (17) and the amplitude of this signal is representative of the viability, and hence the clinical acceptability, of the platelets.
    Type: Grant
    Filed: October 30, 1984
    Date of Patent: July 28, 1987
    Assignee: Brian J. Bellhouse
    Inventors: Brian J. Bellhouse, John W. Stairmand