Patents by Inventor Edward C. Berdich

Edward C. Berdich 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).

  • Oxygen sensing
    Patent number: 6758962
    Abstract: Oxygen concentration measurement is carried out over a broad range by an instrument utilizing a zinc-air cell having a lower-than-nominal potential difference imposed across its electrodes by a shunt branch incorporating the source-drain circuit of a field effect transistor (FET). A feedback circuit is used to improve linearity of the output and cell life without sacrificing the broad dynamic range achieved by the use of the FET shunt branch.
    Type: Grant
    Filed: September 20, 2000
    Date of Patent: July 6, 2004
    Assignee: Doxs Technology Systems, Inc.
    Inventors: Matthew S. Fitzgerald, Edward C. Berdich, Peter M. Draper
  • Apparatus for sensing oxygen concentration
    Patent number: 6099707
    Abstract: An apparatus and method for sensing a concentration of oxygen in a flow of gas in a breathing circuit for a patient. A biasing voltage is provided across a zinc-air cell so that the zinc-air cell produces a current having a magnitude, wherein the magnitude of the current corresponds to the concentration of oxygen in the gas.
    Type: Grant
    Filed: March 22, 1996
    Date of Patent: August 8, 2000
    Assignee: DOXS Technology Systems, Inc
    Inventors: Francis X. Dunigan, Edward C. Berdich, Peter M. Draper
  • Hand-held heating tool with improved heat control
    Patent number: 5554838
    Abstract: A hand-held groover for forming grooves, bevels, etc. in architectural insulation board comprises a resistive cutting blade, a 25 KHz. oscillator, operated by full-wave rectified line current and connected to the cutting blade through a light-weight transformer. The oscillator delivers to the heating element a sequence of electrical pulses synchronized with the line current frequency, each having a duration of 1/120 second. Each pulse consists of plural oscillations at 25 KHz., so that the heating current in the blade is essentially an amplitude-modulated 25 KHz. current. The modulating pulses are selected from the continuous train of 120 Hz. pulses by an adjustable triggering circuit, to adjust the time interval between pulses and thereby control the temperature of the heating element.
    Type: Grant
    Filed: August 23, 1995
    Date of Patent: September 10, 1996
    Assignee: Wind Lock Corporation
    Inventor: Edward C. Berdich
  • Variable height outboard motor mount
    Patent number: 5484311
    Abstract: A motor mount for varying the height of an outboard motor on the transom of a boat comprises a first bracket connected to a transom, and a second bracket connected to an outboard motor. A fluid-driven actuator effects movement of the second bracket relative to the first. One or more guides, each comprising a rod extending through a pair of vertically separated bearings fixed to the interior of a hollow, elongated tubular member, constrains the second bracket to vertical movement when the first bracket is connected to the transom of a boat.
    Type: Grant
    Filed: February 28, 1994
    Date of Patent: January 16, 1996
    Assignee: Detwiler Industries, Inc.
    Inventors: Timothy P. Detwiler, Charles G. Detwiler, Jr., Edward C. Berdich, Peter M. Draper