Patents by Inventor Edward J. Steigerwalt

Edward J. Steigerwalt 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 and apparatus for perforating or cutting with a solid fueled gas mixture
    Patent number: 4446920
    Abstract: A method for cutting pipe casings and concrete liners or perforating the same and localized portions of surrounding strata in an earth bore is set forth wherein a gas phase cutting or perforating jet mixture of fluorine and nitrogen trifluoride is delivered to the cutting or perforation site from the decomposition of a solid, normally stable, perfluoroammonium salt. An appropriate apparatus for delivering the gas mixture of fluorine and nitrogen trifluoride from the salt is also disclosed.
    Type: Grant
    Filed: January 13, 1983
    Date of Patent: May 8, 1984
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Andrew J. Woytek, John T. Lileck, Edward J. Steigerwalt
  • Removal of dinitrogen difluoride from nitrogen trifluoride
    Patent number: 4193976
    Abstract: This invention relates to a process for purifying a nitrogen trifluoride containing atmosphere contaminated with dinitrogen difluoride. The atmosphere is purified by heating the nitrogen trifluoride atmosphere in the presence of a particulate metal capable of defluorinating dinitrogen difluoride, but inert to nitrogen trifluoride, preferably the metal being selected from the group consisting of iron, cobalt, and nickel, to a temperature of from about 300.degree.-1000.degree. F. for a time sufficient to effect defluorination of the dinitrogen difluoride.
    Type: Grant
    Filed: April 6, 1978
    Date of Patent: March 18, 1980
    Assignee: Air Products & Chemicals, Inc.
    Inventors: John T. Lileck, John Papinsick, Edward J. Steigerwalt