Patents by Inventor Per A. P. Comstedt

Per A. P. Comstedt 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).

  • Capacitor unit including a plurality of capacitors
    Patent number: 4750085
    Abstract: Capacitor unit including at least three capacitors (16-19) build up from alternate layers of metal and dielectric placed one above the other. The unit includes two insulation films (1, 2) rolled into a coil (9) one of said films being provided with two parallel first metal layers (3, 4) and the other with two second metal layers (6, 7) placed in tandem, both the latter bridging over both said first metal layers. Ore (7) of the second metal layers and both first metal layers (3, 4) are each provided with connection means (12-14) so that a delta circuit of the capacitors (16-19) is formed.
    Type: Grant
    Filed: April 22, 1987
    Date of Patent: June 7, 1988
    Assignee: Telefonaktiebolaget L M Ericsson
    Inventors: Gerth R. Jonsson, Per A. P. Comstedt, Gosta T. Hedqvist, Arne J. Johansson
  • Load indicators for alternating-current motors
    Patent number: 4333118
    Abstract: A load indicator for A.C. motors has an analog multiplying circuit for producing a signal proportional to the product of the current of the A.C. motor and the voltage thereof. From this signal a signal is substracted which is proportional to the absolute value of the motor current. The average value of the differential signal is a measure of the load of the motor which is substantially independent of variations in the motor voltage, provided the proportionality constants are chosen in a suitable manner.
    Type: Grant
    Filed: January 26, 1981
    Date of Patent: June 1, 1982
    Assignee: El-Fi Innovationer AB
    Inventors: Per A. P. Comstedt, Bo A. Elfner