Patents by Inventor Kalle Hakkarainen

Kalle Hakkarainen 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 switching arrangement for identifying the charger of rechargable batteries of portable devices
    Patent number: 5648711
    Abstract: The object of the Invention is a method and a switching arrangement for identifying the charger of the rechargeable batteries of portable devices. In the solution according to the invention the charger transmits the identification of the charger via a charging cable by switching the charging voltage on and off by using a certain pulse ratio, pulse length, or pulse count. The solution according to the invention can be applied in mobile phone sets.
    Type: Grant
    Filed: May 4, 1995
    Date of Patent: July 15, 1997
    Assignee: Nokia Mobile Phones Ltd.
    Inventor: Kalle Hakkarainen