Patents Assigned to British Technology Limited
  • Transition metal azatetrabenzoporphyrins useful as gas sensors
    Patent number: 5451674
    Abstract: A gas sensor has a gas-sensing component which changes color and/or conductivity on exposure to certain gases, which component comprises a (mono, di or tri) azatetrabenzoporphyrin. Certain (mono, di or tri) azatetrabenzoporphyrins containing a transition metal ion selected from chromium (III), vanadyl, manganese, cobalt or iron (III) are novel.
    Type: Grant
    Filed: November 30, 1993
    Date of Patent: September 19, 1995
    Assignee: British Technology Limited
    Inventors: Jack Silver, Kenneth R. Rickwood, Mustafa T. Ahmet