Patents by Inventor Erik Ordell

Erik Ordell 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).

  • Optical angle-measuring device
    Patent number: 4969744
    Abstract: A plane-parallel plate (E) is irradiated with coherent light from a laser and an interference pattern observed on a screen (S) and imaged on a multi-channel, position defining detector (D). The interference pattern will move when the plate (E) is rotated about its axis. There is thus provided a highly sensitive angle-measuring device with which measurements can be made to fractions of a second of arc.
    Type: Grant
    Filed: February 28, 1989
    Date of Patent: November 13, 1990
    Assignee: Polymetric AB
    Inventor: Erik Ordell