Automatic Patents (Class 361/246)
  • CMOS polarity reversal circuit
    Patent number: 4139880
    Abstract: Two P-channel MOS devices and two N-channel MOS devices are interconnected in a manner to provide a polarity reversal circuit. The circuit contains two input terminals and two output terminals. One of the output terminals is designated as a positive terminal while the other is designated as a negative terminal. Regardless of the polarity of voltage supplied to the input terminals, the positive voltage will always appear on the positive output terminal while the negative voltage will always appear on the negative output terminal.
    Type: Grant
    Filed: October 3, 1977
    Date of Patent: February 13, 1979
    Assignee: Motorola, Inc.
    Inventors: Richard W. Ulmer, Robert R. Beutler
  • Device to detect and automatically control electrical potential polarities
    Patent number: 4034168
    Abstract: A device to detect and control electrical potential polarities between two or more adjacent insulated conductor sections is disclosed. An amplifying circuit monitors the relative state of the polarities of the adjacent conductor sections and actuates a relay to change the same if a difference is sensed. The sensing function of the amplifying circuit is controlled by a switch member.
    Type: Grant
    Filed: December 2, 1974
    Date of Patent: July 5, 1977
    Inventor: Robert Kenneth Brown
  • Transceiver polarity protector
    Patent number: 4027223
    Abstract: A protective device for portable transceivers to assure that improper polarity is not applied to the power input. Two relays, oppositely polarized from each other by use of diodes, sense the applied power polarity and connect that power so that the power applied to the transceivers is always correct.
    Type: Grant
    Filed: July 6, 1976
    Date of Patent: May 31, 1977
    Inventor: Frank G. Renz