Patents by Inventor Sinikka Harjunmaa

Sinikka Harjunmaa 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).

  • Noninvasive refractometer
    Patent number: 10139340
    Abstract: The present invention pertains to the measurement of the refractive index of a medium, such as a fluid, through the wall of its container. The essential characteristic of the invention is that, by using at least two separate light paths that are of unequal length and that reflect from the wall/medium interface, it is possible to perform the measurement of the refractive index of the medium so that the result is insensitive to the color and thickness of the wall.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: November 27, 2018
    Inventors: Hannu Harjunmaa, Sinikka Harjunmaa
  • NONINVASIVE REFRACTOMETER
    Publication number: 20170115214
    Abstract: The present invention pertains to the measurement of the refractive index of a medium, such as a fluid, through the wall of its container. The essential characteristic of the invention is that, by using at least two separate light paths that are of unequal length and that reflect from the wall/medium interface, it is possible to perform the measurement of the refractive index of the medium so that the result is insensitive to the color and thickness of the wall.
    Type: Application
    Filed: June 28, 2016
    Publication date: April 27, 2017
    Inventors: Hannu Harjunmaa, Sinikka Harjunmaa