Patents by Inventor Jorma Kivilahti

Jorma Kivilahti 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 for joining metals by soldering
    Patent number: 6193139
    Abstract: The invention relates to a method for joining coated metallic conductors and the application of the method to production of very high density microjoints as well as to the fabrication of macrojoints. It is characteristic for the invention that the surfaces to be connected are coated with solder metal or solder alloy layers, one on the top of the other. The mating contact areas are heated for a short period of time over the temperature where the base coatings and the top coatings fuse transiently. It is essential that the base coating and the top coating cannot produce intermetallic compounds with each other and that the contact interface between them is as metallic as possible. This kind of contact can be obtained for example by chemical or electrochemical deposition. Moreover, when the topcoat is capable of protecting the base coating, for example bismuth, the joining can be performed under normal atmosphere and without any flux.
    Type: Grant
    Filed: August 21, 1998
    Date of Patent: February 27, 2001
    Inventor: Jorma Kivilahti
  • Method for joining metals by soldering
    Patent number: 6015082
    Abstract: The invention relates to a method for joining coated metallic conductors and the application of the method to production of very high density microjoints as well as to the fabrication of macrojoints. It is characteristic for the invention that the surfaces to be connected are coated with solder metal or solder alloy layers, one on the top of the other. The mating contact areas are heated for a short period of time over the temperature where the base coatings and the top coatings fuse transiently. It is essential that the base coating and the top coating cannot produce intermetallic compounds with each other and that the contact interface between them is as metallic as possible. This kind of contact can be obtained for example by chemical or electrochemical deposition. Moreover, when the topcoat is capable of protecting the base coating, for example bismuth, the joining can be performed under normal atmosphere and without any flux.
    Type: Grant
    Filed: October 17, 1996
    Date of Patent: January 18, 2000
    Inventor: Jorma Kivilahti