Patents by Inventor Helena Westberg

Helena Westberg 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).

  • Prosthetic articles made of surface conversion nitrided titanium or titanium alloys
    Patent number: 5427631
    Abstract: Objects of titanium or titanium alloys having the surface converted to a hard and wear-resistant nitride layer with good adhesion, which is distributed uniformly and also provides internal capillaries. The objects are produced by being treated in a vacuum furnace with an atmosphere of pure nitrogen gas at a temperature of 650.degree.-1000.degree. C. and at a pressure below atmospheric pressure. The thickness of the nitride layer can be controlled by controlling the treatment time and temperature.
    Type: Grant
    Filed: March 30, 1994
    Date of Patent: June 27, 1995
    Assignee: Ytbolaget I Uppsala Aktiebolag
    Inventors: Erik Johansson, Helena Westberg
  • Method of producing integral, hard nitride layer on titanium/titanium alloy
    Patent number: 5320686
    Abstract: Objects of titanium or titanium alloys having the surface converted to a hard and wear-resistant nitride layer with good adhesion, which is distributed uniformly and also provides internal capillaries. The objects are produced by being treated in a vacuum furnace with an atmosphere of pure nitrogen gas at a temperature of 650.degree.-1000.degree. C. and at a pressure below atmospheric pressure. The thickness of the nitride layer can be controlled by controlling the treatment time and temperature.
    Type: Grant
    Filed: March 21, 1991
    Date of Patent: June 14, 1994
    Assignee: Tisurf International AB
    Inventors: Erik Johansson, Helena Westberg