Patents by Inventor Pieter W. G. Duijves

Pieter W. G. Duijves 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).

  • High-frequency optoelectric front-end
    Patent number: 5091641
    Abstract: Optoelectric front-end comprising a photodiode which is not grounded and which drives a bipolar transistor acting as a feedback amplifier between the base and the emitter thereof, so that the d.c. arrangement of the transistor will cause no further noise to develop.
    Type: Grant
    Filed: November 27, 1990
    Date of Patent: February 25, 1992
    Assignee: AT&T Bell Laboratories
    Inventor: Pieter W. G. Duijves
  • Control amplifier
    Patent number: 4912431
    Abstract: A control amplifier enabling large bandwidths (.apprxeq.2 GHz) and a large dynamic control range (.apprxeq.25 dB). The amplifying element is a MESFET. This MESFET is automatically biased. Thus, FET's whose pinch-off voltage is subject to a large variation can be used without further adjustments.
    Type: Grant
    Filed: April 7, 1989
    Date of Patent: March 27, 1990
    Assignee: AT&T Bell Laboratories
    Inventor: Pieter W. G. Duijves