Patents by Inventor Ari J. Ahtiainen

Ari J. Ahtiainen 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).

  • Continuous action capacitive moisture measuring apparatus
    Patent number: 4259632
    Abstract: Capacitive moisture measuring apparatus for continuously measuring the moisture content of granular material, such as grain, includes a series circuit including a measuring capacitor whose capacitance varies as a function of moisture content of granular material in which it is immersed during operation and a resistor coupled to the measuring capacitor, and an oscillator for generating a voltage signal of stable frequency and amplitude which is applied to the circuit. An operational amplifier is serially coupled to a diode to constitute an ideal diode, the latter being coupled across the measuring capacitor.
    Type: Grant
    Filed: November 13, 1978
    Date of Patent: March 31, 1981
    Assignee: OT-tehdas Oy
    Inventor: Ari J. Ahtiainen