Patents by Inventor Jarmo Karhu

Jarmo Karhu 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 measuring instrument for measuring water content
    Patent number: 8188751
    Abstract: For measuring the water content of a web in the wire section of a paper machine, at least one radiofrequency-operated resonator sensor forms an electric near field, in which a web affects the resonance frequency of each resonator sensor. The water content of the web is measured as a function of the resonance frequency of each resonator sensor in a measuring unit.
    Type: Grant
    Filed: May 15, 2006
    Date of Patent: May 29, 2012
    Assignees: Senfit Oy, Metso Paper, Inc
    Inventors: Pekka Jakkula, Jarmo Karhu, Kari Luostarinen, Matti Limingoja
  • Method for microwave measurement, measuring device and oscillator
    Patent number: 7616009
    Abstract: An object to be measured is measured using microwave radiation. Oscillation energy is generated by means of a feedback coupled active unit. The solution involves generating resonance into at least one oscillator, each oscillator comprising at least one open resonator, each resonator being coupled to at least one active unit, by using the object to be measured as a functional part of the resonator, the object to be measured causing a resonance frequency dependent on the location of a surface of the object to be measured to be generated in each oscillator. A measurement part determines at least one characteristic of the object to be measured on the basis of the resonance frequency of each oscillator.
    Type: Grant
    Filed: September 19, 2005
    Date of Patent: November 10, 2009
    Assignee: Senfit Oy
    Inventors: Pekka Jakkula, Taavi Hirvonen, Juha Heikkinen, Taisto Soikkeli, Olavi Hyry, Jarmo Karhu
  • Method and Measuring Instrument for Measuring Water Content
    Publication number: 20080211516
    Abstract: For measuring the water content of a web in the wire section of a paper machine, at least one radiofrequency-operated resonator sensor forms an electric near field, in which a web affects the resonance frequency of each resonator sensor. The water content of the web is measured as a function of the resonance frequency of each resonator sensor in a measuring unit.
    Type: Application
    Filed: May 15, 2006
    Publication date: September 4, 2008
    Applicant: Elektrobit Microwave Oy
    Inventors: Pekka Jakkula, Jarmo Karhu, Kari Luostarinen, Matti Limingoja
  • Method for Microwave Measurement, Measuring Device and Oscillator
    Publication number: 20070268024
    Abstract: An object to be measured is measured using microwave radiation. Oscillation energy is generated by means of a feedback coupled active unit. The solution involves generating resonance into at least one oscillator, each oscillator comprising at least one open resonator, each resonator being coupled to at least one active unit, by using the object to be measured as a functional part of the resonator, the object to be measured causing a resonance frequency dependent on the location of a surface of the object to be measured to be generated in each oscillator. A measurement part determines at least one characteristic of the object to be measured on the basis of the resonance frequency of each oscillator.
    Type: Application
    Filed: September 19, 2005
    Publication date: November 22, 2007
    Inventors: Pekka Jakkula, Taavi Hirvonen, Juha Heikkinen, Taisto Soikkeli, Olavi Hyry, Jarmo Karhu