Patents by Inventor Tapio Wiik

Tapio Wiik 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).

  • Dew point detection method and device
    Patent number: 4378168
    Abstract: A piezoelectric sensor consists of material for transmitting elastic waves and has a surface subjected to the condensation and presence of dew and liquid to be detected. A wave producing device includes a transmitter for producing an acoustic surface wave on the surface in conjunction with piezoelectric phenomena of the sensor. A detector includes a receiver for receiving the wave after transmission thereof across the surface. The wave is variably attenuated in transmission between the transmitter and receiver in accordance with dew or liquid on the surface. A measuring device measures the attenuation of the detected wave and thereby indicates the dew point or presence of liquid on the surface.
    Type: Grant
    Filed: February 26, 1981
    Date of Patent: March 29, 1983
    Assignee: Vaisala Oy
    Inventors: Heikki Kuisma, Tapio Wiik