Patents by Inventor Paul C. Krueger

Paul C. Krueger 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).

  • Enhanced heat transfer surfaces
    Patent number: 4846267
    Abstract: Aluminum alloys suitable for fabrication into plate and fin type heat exchangers are subjected to a chemical etching procedure in order to improve the heat transfer efficiency thereof. Applicants have found that a high temperature heat treatment of an aluminum alloy plate material to produce a precipitate, followed by exposure to an etching composition, results in a heat exchanger surface modified by the formation of pits. The heat exchangers so modified may be advantageously used in the reboiler/condensor section of air separation units.
    Type: Grant
    Filed: March 14, 1988
    Date of Patent: July 11, 1989
    Assignee: The BOC Group, Inc.
    Inventors: Walter J. Shattes, Nikhiles Bandyopadhyay, Paul C. Krueger
  • Process of forming enhanced heat transfer surfaces
    Patent number: 4767497
    Abstract: Aluminum alloys suitable for fabrication into plate and fin type heat exchangers are subjected to a chemical etching procedure in order to improve the heat transfer efficiency thereof. Applicants have found that a high temperature heat treatment of an aluminum alloy plate material to produce a precipitate, followed by exposure to an etching composition, results in a heat exchanger surface modified by the formation of pits. The heat exchangers so modified may be advantageously used in the reboiler/condensor section of air separation units.
    Type: Grant
    Filed: April 1, 1987
    Date of Patent: August 30, 1988
    Assignee: The BOC Group, Inc.
    Inventors: Walter J. Shattes, Nikhiles Bandyopadhyay, Paul C. Krueger
  • Circuits for decoding pulse signals
    Patent number: 4039958
    Abstract: A decoding circuit comprises: a gated oscillator, designed to generate a are-wave pulse train having a long first positive pulse followed by short spaces and short positive pulses, having its output connected to the clock input of an oscillator counter and its control input connected to the output of a flip-flop; a signal input terminal connected to the SET input of the flip-flop and also to the clock input of a signal counter; a first three-input AND gate having two inputs connected, respectively, in opposite phase to the first count outputs of the two counters and its third input connected through an inverter to the oscillator output; means connecting the gate output to RESETS of the flip-flop and the two counters; a second three-input AND gate having two inputs connected, respectively, in opposite phase to the Nth count outputs of the two counters and the third input connected directly to the oscillator output; means connecting the second gate output to the RESETS of the flip-flop and counters; a third thr
    Type: Grant
    Filed: January 3, 1977
    Date of Patent: August 2, 1977
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Paul C. Krueger