Patents by Inventor Per F. Tengblad

Per F. Tengblad 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 increasing the pressure in oil-bearing geological structures
    Patent number: 4416332
    Abstract: A method for increasing pressure in geological oil-bearing structures by gas production due to microbial activity comprising adding to a geological oil-bearing structure, a methane producing aneorobic micro-organism, a culture medium and formic acid. The formic acid is converted to carbon dioxide and methane gases resulting in increased pressure in the structures.
    Type: Grant
    Filed: June 3, 1981
    Date of Patent: November 22, 1983
    Assignee: Chemical Dynamics Sweden AB
    Inventors: Lars I. Wiberger, Peter H. Ronnow, Per F. Tengblad, Bert G. H. Hellman
  • Method for increasing the pressure in oil-bearing geological structures
    Patent number: 4300632
    Abstract: A method for increasing pressure in geological oil-bearing structures by gas production due to microbial activity comprising adding to a geological oil-bearing structure, an aneorobic micro-organism (Methanobacterium Termoautotroficum), a culture medium and formic acid. The formic acid is converted to carbon dioxide and methane gases resulting in increased pressure in the structures.
    Type: Grant
    Filed: October 17, 1979
    Date of Patent: November 17, 1981
    Assignee: Chemical Dynamics Sweden AB
    Inventors: Lars I. Wiberger, Peter H. Ronnow, Per F. Tengblad, Bert G. H. Hellman