Patents by Inventor Prakash Thomas

Prakash Thomas 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).

  • Seamless cylinder shell construction
    Patent number: 5485736
    Abstract: A method of forming a seamless cylinder shell in which a layer of nickel is electroplated on a steel sheet so that a composite sheet is formed. The composite sheet is then preferably cut into a circular blank before further processing. The circular blank is subjected to an oxalic acid pretreatment for the nickel side and a zinc phosphate pretreatment for the steel side to retain a lubricant on the two opposed surfaces thereof and is thereafter lubricated with the lubricant. The circular blank is preferably cupped, relubricated, and drawn into the seamless cylinder shell. The seamless cylinder shell can be finished into a seamless gas cylinder by spinning one end of the cylinder into a cylinder head, internally threading the formed cylinder head, and then heat treating the cylinder.
    Type: Grant
    Filed: March 22, 1994
    Date of Patent: January 23, 1996
    Assignee: The BOC Group, Inc.
    Inventors: John P. Collier, Richard Hogle, James G. Marsh, Prakash Thomas
  • Seamless cylinder shell construction
    Patent number: 5330091
    Abstract: A method of forming a seamless cylinder shell in which a nickel sheet is clad to a steel sheet so that the sheets are uniformly bonded throughout and a composite sheet is formed. The cladding is preferably effectuated by explosive cladding. The composite sheet is then preferably cut into a circular blank before further processing. The circular blank is subjected to an oxalic acid pretreatment to retain a lubricant on the two opposed surfaces thereof and is thereafter lubricated with the lubricant. The circular blank is preferably cupped, relubricated, and drawn into the seamless cylinder shell. The seamless cylinder shell can be finished into a seamless gas cylinder by spinning one end of the cylinder into a cylinder head, internally threading the formed cylinder head, and then heat treating the cylinder.
    Type: Grant
    Filed: October 9, 1992
    Date of Patent: July 19, 1994
    Assignee: The BOC Group, Inc.
    Inventors: John P. Collier, Richard Hogel, James G. Marsh, Prakash Thomas