Patents by Inventor Francis X. Dobscha

Francis X. Dobscha 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).

  • Pass-through zone isolation packer and process for isolating zones in a multiple-zone well
    Patent number: 5226485
    Abstract: A pass-through zone isolation packer and process for isolating zones in a multiple-zone well. The pass-through zone isolation packer has an upper packer sub with an upper sub through hole and a lower packer sub with a lower sub through hole. A packer mandrel having a through bore is positioned through the upper sub through hole and the lower sub through hole. The upper packer sub and the lower packer sub are secured to the packer mandrel. A packer element is positioned between and is secured to the upper packer sub and the lower packer sub. Likewise, a packer bladder is positioned between the upper packer sub and the lower packer sub. The packer bladder is hermetically sealed to both the upper packer sub and the lower packer sub, so as to form a gas-tight annular gas chamber between the packer mandrel and the packer bladder. An inlet tube is used to introduce a pressurized gas through the upper packer sub and into the annular gas chamber.
    Type: Grant
    Filed: November 12, 1992
    Date of Patent: July 13, 1993
    Assignee: Gas Research Institute
    Inventors: Francis X. Dobscha, Stephen W. Lambert, Jerrald L. Saulsberry
  • Pass-through zone isolation packer and process for isolating zones in a multiple-zone well
    Patent number: 5184677
    Abstract: A pass-through zone isolation packer and process for isolating zones in a multiple-zone well. The pass-through zone isolation packer has an upper packer sub with an upper sub through hole and a lower packer sub with a lower sub through hole. A packer mandrel having a through bore is positioned through the upper sub through hole and the lower sub through hole. The upper packer sub and the lower packer sub are secured to the packer mandrel. A packer element is positioned between and is secured to the upper packer sub and the lower packer sub. Likewise, a packer bladder is positioned between the upper packer sub and the lower packer sub. The packer bladder is hermetically sealed to both the upper packer sub and the lower packer sub, so as to form a gas-tight annular gas chamber between the packer mandrel and the packer bladder. An inlet tube is used to introduce a pressurized gas through the upper packer sub and into the annular gas chamber.
    Type: Grant
    Filed: May 10, 1991
    Date of Patent: February 9, 1993
    Assignee: Gas Research Institute
    Inventor: Francis X. Dobscha