Patents by Inventor John Stephen Wakeman

John Stephen Wakeman 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).

  • Spectrophotometric analysis
    Patent number: 5763884
    Abstract: A method of and apparatus for spectrophotometric analysis of a powder material by reflectance measurements of a near infrared beam has a sample cell 2 within which the powder 20A is compressed between a spring biased plate 13 and a window 8 to a predetermined density. Spectrophotometric analysis is effected on the powder 20A through the window 8 by scanning with the infrared beam over an area of the powder 20A which when multiplied by the density of the powder and the depth of penetration of the beam is consistent with a predetermined dosage weight--such as that at which the powder may be marketed.
    Type: Grant
    Filed: April 23, 1996
    Date of Patent: June 9, 1998
    Assignee: Pfizer Inc.
    Inventors: Stephen Victor Hammond, John Stephen Wakeman, David Grant Romans