Patents by Inventor Eric Eisfeld

Eric Eisfeld 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).

  • Method and apparatus for transmitter for universal garage door opener
    Patent number: 5790948
    Abstract: A universal remote control transmitter for use with garage door openers including a number of switches whereby a user can program a transmitted modulation format and carrier frequency, and a controller for scanning the switches to determine the user programmed selections. The controller, in response to the programmed selections, outputs the required modulation to a selected transmitter, as well as direction to fine tune the transmitter to the particular carrier frequency. Also included is a power sensor circuit that responds to a change in power supply voltage by adjusting the modulation to maintain a constant peak transmitter output power.
    Type: Grant
    Filed: October 2, 1996
    Date of Patent: August 4, 1998
    Assignee: Universal Devices
    Inventors: Eric Eisfeld, James Long, Gordon Force
  • Method and apparatus for transmitter for universal garage door opener
    Patent number: 5564101
    Abstract: A universal remote control transmitter for use with garage door openers including a number of switches whereby a user can program a transmitted modulation format and carrier frequency, and a controller for scanning the switches to determine the user programmed selections. The controller, in response to the programmed selections, outputs the required modulation to a selected transmitter, as well as direction to fine tune the transmitter to the particular carrier frequency. Also included is a power sensor circuit that responds to a change in power supply voltage by adjusting the modulation to maintain a constant peak transmitter output power.
    Type: Grant
    Filed: July 21, 1995
    Date of Patent: October 8, 1996
    Assignee: Universal Devices
    Inventors: Eric Eisfeld, James Long, Gordon Force