Patents by Inventor John H. Burrows

John H. Burrows 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 making an extraction cartridge
    Patent number: 5603160
    Abstract: An extraction cartridge, for extracting a component from a composition, contains a packing composition including a buffer composition, diatomaceous earth and absorbent. The cartridge is made by heating each component to assure it is free from contaminants. The diatomaceous earth is sifted to obtain a particular particle size. The cartridge also includes frits and filters for holding the packing composition within the cartridge. All of the components of the cartridge are selected or processed to assure that no contaminants are leached into the sample being extracted. A processing system automatically processes a plurality of cartridges. The processing system, which is capable of continuous operation, includes a platform, a rack for holding the cartridges, sample vials and extraction tubes.
    Type: Grant
    Filed: April 10, 1995
    Date of Patent: February 18, 1997
    Assignee: Phoenix International Life Sciences Inc.
    Inventors: Denis Lessard, John H. Burrows
  • Method for extraction, extraction cartridge and automated extraction processing system
    Patent number: 5598933
    Abstract: An extraction cartridge, for extracting a component from a composition, contains a packing composition including a buffer composition, diatomaceous earth and absorbent. The cartridge is made by heating each component to assure it is free from contaminants. The diatomaceous earth is sifted to obtain a particular particle size. The cartridge also includes frits and filters for holding the packing composition within the cartridge. All of the components of the cartridge are selected or processed to assure that no contaminants are leached into the sample being extracted. A processing system automatically processes a plurality of cartridges. The processing system, which is capable of continuous operation, includes a platform, a rack for holding the cartridges, sample vials and extraction tubes.
    Type: Grant
    Filed: April 10, 1995
    Date of Patent: February 4, 1997
    Assignee: Phoenix International Life Sciences Inc.
    Inventors: Denis Lessard, John H. Burrows
  • Method for extraction, extraction cartridge and automated extraction processing system
    Patent number: 5585070
    Abstract: An extraction cartridge, for extracting a component from a composition, contains a packing composition including a buffer composition, diatomaceous earth and absorbent. The cartridge is made by heating each component to assure it is free from contaminants. The diatomaceous earth is sifted to obtain a particular particle size. The cartridge also includes frits and filters for holding the packing composition within the cartridge. All of the components of the cartridge are selected or processed to assure that no contaminants are leached into the sample being extracted. A processing system automatically processes a plurality of cartridges. The processing system, which is capable of continuous operation, includes a platform, a rack for holding the cartridges, sample vials and extraction tubes.
    Type: Grant
    Filed: April 29, 1994
    Date of Patent: December 17, 1996
    Assignee: Phoenix International Life Sciences Inc.
    Inventors: Denis Lessard, John H. Burrows