Patents by Inventor Rauli Virkkala

Rauli Virkkala 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 measuring gas content and a gas content measuring device
    Patent number: 6012324
    Abstract: The invention relates to a method for measuring gas content in a fluid, such as papermaking pulp or coating paste, and to a gas content measuring device. Pressure variations generated by a pump, for instance, are to occur in the fluid. Travel time, phase and/or attenuation of the microwave signal (20) are measured with the gas content measuring device while the signal (20) penetrates through the fluid (13), and the gas content is determined on the basis of changes in travel time, phase and/or attenuation of the microwave signal (20) caused by pressure variations of the fluid (13).
    Type: Grant
    Filed: May 19, 1998
    Date of Patent: January 11, 2000
    Assignee: Valmet Automation Inc.
    Inventors: Pekka Jakkula, Urpo Kasurinen, Rauli Virkkala, Jouko Niinimaki