Patents by Inventor Gotfred Hartmann

Gotfred Hartmann 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).

  • Nitrogen injection
    Patent number: 4895710
    Abstract: A method for production of nitrogen for application at high pressure, preferably for pressure injection in submarine or substerranean oil or natural gas wells, by combination of natural gas in air, which is compressed prior to the combustion, for binding of the oxygen content of the air in carbon dioxide to be removed from the flue gas by absorption, whereas the remaining nitrogen is pressurized to a predetermined high pressure suitable for such application.
    Type: Grant
    Filed: October 9, 1987
    Date of Patent: January 23, 1990
    Assignee: Helge G. Gran
    Inventors: Gotfred Hartmann, Helge G. Gran