Patents by Inventor Alfward Farwer

Alfward Farwer 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).

  • Process for the TIG alternating-current welding of aluminum
    Patent number: 6303892
    Abstract: The process for the TIG alternating-current welding of aluminum using an inert-gas mixture of helium and argon uses an inert-gas mixture of 83 to 95% by volume of helium, the remainder being predominantly argon.
    Type: Grant
    Filed: August 13, 1999
    Date of Patent: October 16, 2001
    Assignee: Messer Griesheim GmbH
    Inventor: Alfward Farwer
  • Protective gas for tig welding
    Patent number: 6237836
    Abstract: The invention relates to a protective gas for TIG welding of metals, especially high alloy or low alloy steel, whose thermal conductivity is lower than that of aluminium. The inventive gas consists of argon, helium and hydrogen and enables significant improvements to be made in electric arc stability, welding speed, oxidation of weld surface and adjacent area, flow-on performance and weld appearance.
    Type: Grant
    Filed: May 1, 2000
    Date of Patent: May 29, 2001
    Assignee: Messer Griesheim GmbH
    Inventor: Alfward Farwer
  • Protective gas for the laser welding of aluminum
    Patent number: 5488216
    Abstract: In the laser welding of aluminum, argon, helium and mixtures thereof are used as protective gases. To improve the welding behavior, 80 vpm to 250 vpm, preferably 120 vpm to 180 vpm of nitrogen, nitrous oxide or nitrogen/nitrous oxide mixture are added to the protective gas.
    Type: Grant
    Filed: August 10, 1994
    Date of Patent: January 30, 1996
    Assignee: Messer Griesheim GmbH
    Inventor: Alfward Farwer
  • Inert gas for TIG, MIG, MAG and plasma welding
    Patent number: 5210388
    Abstract: Argon having a high degree of purity or else a mixture having a high degree of purity consisting of argon, helium, hydrogen, oxygen and/or carbon dioxide are used as the inert gas for TIG, MIG, MAG and plasma welding. For purposes of improving the welding result, 80 ppm to 250 ppm, preferably 120 ppm to 180 ppm of nitrogen are added to the inert gas.
    Type: Grant
    Filed: March 2, 1992
    Date of Patent: May 11, 1993
    Assignee: Messer Griesheim GmbH
    Inventor: Alfward Farwer
  • Shielding gas for arc welding of aluminum
    Patent number: 5210389
    Abstract: A shielding gas for the arc welding of aluminum consists of argon or mixtures of argon and helium. The shielding gas also includes an admixture of 80 ppm to 250 ppm of nitrogen.
    Type: Grant
    Filed: September 26, 1991
    Date of Patent: May 11, 1993
    Assignee: Messer Griesheim GmbH
    Inventor: Alfward Farwer
  • Liquid-tight seal for storage batteries
    Patent number: 4091189
    Abstract: Metallic lead-throughs of batteries are coated with resin having carboxyl radicals. The resulting product and the method of producing it.
    Type: Grant
    Filed: June 9, 1976
    Date of Patent: May 23, 1978
    Assignee: Varta Batterie Aktiengesellschaft
    Inventors: Alfward Farwer, Wolfgang Kujawa, Klaus Schulze