Patents by Inventor Torulf Pettersson

Torulf Pettersson 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 determination of concentration
    Patent number: 4110044
    Abstract: The percentage of suspended substances in a flowing medium is indicated by illuminating said medium with light perpendicularly to the direction of flow. The light intensity is held mainly constant at a predetermined value. Detection is made by a first light detector of light radiated from the medium in a predetermined direction and the electrical signal obtained is led to a device squaring the effective value of the portion of said signal lying within a predetermined frequency range. The percentage of the suspended substance is obtained from said square of the effective value.
    Type: Grant
    Filed: November 23, 1976
    Date of Patent: August 29, 1978
    Assignee: Svenska Traforskningsinstitutet
    Inventors: Torulf Pettersson, Gerdt Fladda, Lennart Eriksson