Patents Assigned to Clairaire Limited
  • Publication number: 20080308733
    Abstract: There is disclosed a gas sensor comprising an electromagnetic radiation source, a detector which is sensitive to radiation from the source and a waveguide which comprises at least a part of an optical path from the source to the detector through a gas sample, the waveguide comprising a first waveguide portion which extends from the radiation source and a reflector which is arranged to change the direction of and laterally displace radiation conducted from the source through the first waveguide portion into a second waveguide portion which is separate to the first waveguide portion and which conducts received radiation towards the detector. The gas sensor can be formed as a layered structure. A convoluted passage allows gas access to the optical path.
    Type: Application
    Filed: May 21, 2008
    Publication date: December 18, 2008
    Applicant: Clairair Limited
    Inventor: Alan Mason Doncaster
  • Patent number: 4274979
    Abstract: Activated carbon is made by pre-treating a fibrous cellulose material with a Lewis acid comprising one or more selected halides, drying and softening the treated material, suspending the material from a frame in a tensionless manner, heating the suspended material in a furnace to effect carbonization of the cellulosic material in an environment which is substantially non-reactive towards that material, activating the suspended carbonized material at an elevated temperature in an atmosphere comprising an activating gas until the desired degree of activation has been produced, and thereafter cooling the furnace, the furnace having at least one heating element at its base and at least one heating element arranged on or in a side wall, each heating element being spaced apart from the suspended material.
    Type: Grant
    Filed: September 7, 1979
    Date of Patent: June 23, 1981
    Assignee: Clairaire Limited
    Inventor: Keith Simpson