Patents by Inventor Hans F. Lofberg

Hans F. Lofberg 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).

  • Reflex device with marking behind cover layer
    Patent number: 4264665
    Abstract: A reflex device has a marking or other particular distinctive feature provided on a carrier which is located behind a covering layer having a light reflectivity and a light transmission varying in response to the direction of incidence of incident light. The covering layer offers the highest reflectivity and the lowest transmission to light having a direction of incidence substantially perpendicular to said layer.
    Type: Grant
    Filed: September 26, 1978
    Date of Patent: April 28, 1981
    Inventor: Hans F. Lofberg