Patents by Inventor Douglas J. Reid

Douglas J. Reid 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).

  • Friability testing apparatus
    Patent number: 5140857
    Abstract: The invention provides a friability testing apparatus which has an electrically excitable vibrator (10, 12) for vibrating a capsule (14) containing material to be tested. The apparatus includes a microprocssor (20) which proivdes an output waveform with a frequency which is determined by an oscillator (22). The output of the microprocssor drives a power amplifier (18) which controls the vibrator. An accelerometer (16) supplies signal to the microprocessor, so that the operation of the vibrator is maintained within predetermined limits.
    Type: Grant
    Filed: December 11, 1990
    Date of Patent: August 25, 1992
    Inventor: Douglas J. Reid
  • Method of making tool inserts and drill bits
    Patent number: 4481016
    Abstract: A method of making inserts suitable for tool or drill bits which includes the step of fragmenting, e.g. by means of a laser beam, an abrasive compact in a plurality of discrete, non-segmental fragments. The inserts may have a variety of shapes, some of which are new, such as conical, truncated conical or truncated pyrimidal. The inserts are particularly useful for wire-drawing die blanks and core or oil-well drill bits.
    Type: Grant
    Filed: November 30, 1981
    Date of Patent: November 6, 1984
    Inventors: Nicoll A. D. Campbell, Henry B. Dyer, Rainer Dietrich, Cornelius Phaal, Douglas J. Reid