Patents by Inventor Pierce C. Roselle

Pierce C. Roselle 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).

  • A.C. potentiometer with bridge having voltage controllable devices
    Patent number: 3965410
    Abstract: An a.c. potentiometer wherein the gain of a variable gain circuit is controlled by a d.c. reference signal and a d.c. input signal, the gain being adjusted to be proportional to the ratio of the d.c. input signal to the d.c. reference signal. An a.c. reference is added to the d.c. reference. Since the gain of the circuit is equal for both a.c. and d.c. input voltages, the a.c. signal at the circuit a.c. output terminals is proportional to the a.c. reference signal and the ratio of the d.c. input signal to the d.c. reference signal which defines the gain. Desired electrical isolation of the a.c. circuitry from the d.c. circuitry is achieved by means of input and output coupling transformers for the a.c. signals.
    Type: Grant
    Filed: August 11, 1975
    Date of Patent: June 22, 1976
    Assignee: Sperry Rand Corporation
    Inventors: Pierce C. Roselle, Roy A. Zaborowski