Patents by Inventor John R. P. Clarke

John R. P. Clarke 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).

  • Flow injection analysis
    Patent number: 5156814
    Abstract: A liquid pump, particularly though not exclusively suitable for use in flow injection analysis, and comprising a reservoir 3 an outlet tube 6 for conducting liquid 2 from the reservoir and a device for introducing gas into the liquid in the reservoir to displace liquid therefrom through the tube. The gas may be introduced in the form of a series of rapid pulses of controlled duration and frequency and is introduced at a fixed level relative to the entrance to the outlet tube.
    Type: Grant
    Filed: December 3, 1990
    Date of Patent: October 20, 1992
    Assignees: University of Manchester Institute of Science & Technology, Imperial Chemical Industries PLC, Peter R. Fielden
    Inventors: Peter R. Fielden, John R. P. Clarke
  • Detection system
    Patent number: 5007996
    Abstract: A detection system for the detection of e.g. chlorine in a gas stream comprises an elongate support (14) which has electrolyte distributed along its length and is provided with a pair of electrodes (18,20), the electrolyte being chemically reactive with the gas to be detected to produce an electric current detectable by the electrodes. The electrolyte may be distributed along the support by capillary action or it may incorporate a viscosity-enchancing agent to allow the electrolyte to remain in place along the length of the support thereby avoiding loss of electrolyte by dripping.
    Type: Grant
    Filed: October 16, 1989
    Date of Patent: April 16, 1991
    Assignee: Imperial Chemical Industries PLC
    Inventor: John R. P. Clarke
  • Microwave moisture sensing arrangement
    Patent number: 4991915
    Abstract: A microwave moisture sensing arrangement comprises an oscillator and a detector and a microwave strip line sensor connected between the two. The sensor is inserted into bulk, penetrable materials. The detector detects a change in received signal due to absorption of radiation from the sensor. Moisture content of the material is determined by calibration.
    Type: Grant
    Filed: July 25, 1989
    Date of Patent: February 12, 1991
    Assignees: Imperial Chemical Industries PLC Manchester Polytechnic, Frank Thompson
    Inventors: Frank Thompson, John R. P. Clarke
  • Method of analysis
    Patent number: 4204838
    Abstract: Method for detecting the presence of a substance contained in a fluid medium, which medium also contains particulate matter therein, comprising the addition of at least a portion of the fluid medium to a leaf material capable of separating by diffusion the fluid medium from the particulate matter and examination, using instrumental detection means, for the presence of the substance contained in the fluid medium in a detection area on the leaf material to which the fluid medium has diffused away from the particulate matter. Apparatus for performing the method where the fluid is a liquid is also described.
    Type: Grant
    Filed: June 1, 1978
    Date of Patent: May 27, 1980
    Assignee: Imperial Chemical Industries Limited
    Inventors: John H. Atherton, Derrick C. Dobson, Ian Hodgkinson, John R. P. Clarke