Patents by Inventor Carl S. G. Lawenhaupt

Carl S. G. Lawenhaupt 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).

  • Photocell controlled power supply circuit for an LED
    Patent number: 4330706
    Abstract: A power supply for a light emitting diode (2) is governed by two photo diodes (6,7) each arranged to act upon the base of one of two transistors (3,4) in a darlington connection. One photo diode (6) is adapted to be influenced by low intensity light, whereas the other diode (7) is adapted to be influenced by light of higher intensity.
    Type: Grant
    Filed: March 10, 1980
    Date of Patent: May 18, 1982
    Assignee: Aimpoint AB
    Inventor: Carl S. G. Lawenhaupt