Patents by Inventor Paul D. I. Fletcher

Paul D. I. Fletcher 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).

  • Depth and concentration estimation
    Patent number: 7027167
    Abstract: A method of estimating dimensions of an opening (36) in a body (26) comprises filling the opening (36) with a fluid that absorbs an electromagnetic radiation (40). The radiation (40) is transmitted through the body (26) and through the fluid in the opening (36). The intensity of the electromagnetic radiation, after transmission through the fluid, is determined at an area that corresponds to a radiation path through the fluid in the opening. The intensity is used to determine the absorbance of the fluid in the radiation path and consequently the length of the radiation path. In an alternative method, when the depths of the opening are already known, the intensity is used to determine concentration of a chemical in the opening.
    Type: Grant
    Filed: June 26, 2002
    Date of Patent: April 11, 2006
    Assignee: Micro Chemical Systems Limited
    Inventors: Stephen J. Haswell, Paul D. I. Fletcher, Xunli Zhang
  • Method to monitor chemical reactions in a micro-reactor by measuring an electrical current
    Patent number: 6989090
    Abstract: A reaction is performed in a micro-reactor (10), voltages being applied by a power supply (12), under the control of a processor (14), so as to cause the reagents to move and react in the channels (24?,30?,32?,34?,36?) of the micro-reactor (10). The power supply (12) also measures currents in the channels and relays this information to the processor (14). The currents are used to monitor progress of the reaction.
    Type: Grant
    Filed: August 2, 2002
    Date of Patent: January 24, 2006
    Assignee: Micro Chemical Systems Limited
    Inventors: Stephen J. Haswell, Paul D. I. Fletcher, Xunli Zhang
  • Monitoring of chemical reactions
    Publication number: 20030047454
    Abstract: A reaction is performed in a micro-reactor (10), voltages being applied by a power supply (12), under the control of a processor (14), so as to cause the reagents to move and react in the channels (24′,30′,32′,34′,36′) of the micro-reactor (10). The power supply (12) also measures currents in the channels and relays this information to the processor (14). The currents are used to monitor progress of the reaction.
    Type: Application
    Filed: August 2, 2002
    Publication date: March 13, 2003
    Applicant: Micro Chemical Systems Limited
    Inventors: Stephen J. Haswell, Paul D.I. Fletcher, Xunli Zhang
  • Depth and concentration estimation
    Publication number: 20030016362
    Abstract: A method of estimating dimensions of an opening (36) in a body (26) comprises filling the opening (36) with a fluid that absorbs an electromagnetic radiation (40). The radiation (40) is transmitted through the body (26) and through the fluid in the opening (36). The intensity of the electromagnetic radiation, after transmission through the fluid, is determined at an area that corresponds to a radiation path through the fluid in the opening. The intensity is used to determine the absorbance of the fluid in the radiation path and consequently the length of the radiation path.
    Type: Application
    Filed: June 26, 2002
    Publication date: January 23, 2003
    Applicant: Micro Chemical Systems Limited
    Inventors: Stephen J. Haswell, Paul D.I. Fletcher, Xunli Zhang