Patents by Inventor John E. Preedy

John E. Preedy 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).

  • Method for detecting diamonds in remote locations
    Patent number: 4919533
    Abstract: A method for detecting diamonds in locations which are not easily accessible comprises irradiating material suspected of containing diamonds by means adapted for access to the location, collecting the resultant scattered Raman radiation by means adapted for access to the location and filtering and sensing the radiation to produce a signal whenever radiation characteristic of diamonds is sensed whereby the absence or the presence of diamonds in the location is indicated.
    Type: Grant
    Filed: November 15, 1988
    Date of Patent: April 24, 1990
    Assignee: The British Petroleum Company plc
    Inventors: Heather J. Bowley, Donald L. Gerrard, John E. Preedy
  • Diamond separation using raman scattering
    Patent number: 4693377
    Abstract: A method for separating diamonds from gangue in which discrete units of gangue are passed through a beam of laser radiation capable of causing Raman spectral activation. The scattered radiation is detected and caused to actuate an ejector which separates units of diamond containing gangue from units of non-diamond containing gangue. The units of diamond containing gangue are then collected together.
    Type: Grant
    Filed: August 27, 1986
    Date of Patent: September 15, 1987
    Assignee: The British Petroleum Company p.l.c.
    Inventors: Donald L. Gerrard, John E. Preedy, Kenneth P. J. Williams
  • Polymer composition
    Patent number: 4131481
    Abstract: This specification relates to foams produced from ion leachable glass and a polycarboxylic acid.
    Type: Grant
    Filed: March 22, 1977
    Date of Patent: December 26, 1978
    Assignee: The British Petroleum Company Limited
    Inventors: Paul H. Drake, Colin J. Humphris, John E. Preedy