Patents by Inventor Richard A. Callahan

Richard A. Callahan 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).

  • Publication number: 20170034974
    Abstract: ‘RKD’ is a Gala-type apple tree distinguished by its early maturing and early full-coloring fruit.
    Type: Application
    Filed: July 28, 2015
    Publication date: February 2, 2017
    Applicant: Callahan Orchards LLC
    Inventor: Richard Callahan
  • Patent number: 6953492
    Abstract: An apparatus and process for providing purified natural gas wherein a natural gas feed mixture of hydrocarbons, nitrogen, and other permeable gases is provided to a semi-permeable membrane separator having a relatively higher selectivity for methane and other hydrocarbons and a relatively lower selectivity for nitrogen, to thereby provide a gaseous permeate product enriched in hydrocarbons and diminished in nitrogen.
    Type: Grant
    Filed: June 1, 2001
    Date of Patent: October 11, 2005
    Assignee: Enerfex, Inc.
    Inventor: Richard A. Callahan
  • Publication number: 20040035291
    Abstract: An apparatus and process for providing purified natural gas wherein a natural gas feed mixture of hydrocarbons, nitrogen, and other permeable gases is provided to a semi-permeable membrane separator having a relatively higher selectivity for methane and other hydrocarbons and a relatively lower selectivity for nitrogen, to thereby provide a gaseous permeate product enriched in hydrocarbons and diminished in nitrogen.
    Type: Application
    Filed: March 27, 2003
    Publication date: February 26, 2004
    Inventor: Richard A. Callahan
  • Patent number: 6128916
    Abstract: An apparatus and method are described for refrigeration employing a condenser, an evaporator, and a compressor, wherein a condenser vent is provided for exhausting accumulated mixtures of non-condensable gas, such as air, and refrigerant gas, wherein accumulated non-condensable gas mixed with refrigerant gas from the condenser vent is provided to a membrane separator comprising at least two chambers separated by a selective membrane, said chambers being a high pressure chamber to which the non-condensable gas mixed with refrigerant gas is supplied, and a low pressure chamber into which the refrigerant gas is selectively permeated through said selective membrane for reintroduction and reuse in the refrigeration cycle, and on said high pressure chamber of said membrane separator, a vent is provided to exhaust non-condensable gas-rich raffinate gas.
    Type: Grant
    Filed: November 27, 1998
    Date of Patent: October 10, 2000
    Assignee: Enerfex, Inc.
    Inventors: Richard A. Callahan, Kishore V. Khandavalli
  • Patent number: 5873928
    Abstract: A membrane process and apparatus are described for the production of a desired very high purity permeate gas by use of a multiple stage membrane process wherein in a primary stage a process feed gas mixture is provided to a primary membrane separator unit comprising a membrane having a relatively high intrinsic permeability to provide an intermediate permeate gas and a retentate gas, and providing the intermediate permeate gas in a secondary stage to a secondary membrane separator unit comprising a membrane having a relatively low intrinsic permeability, to produce therefrom a very high purity permeate gas product.
    Type: Grant
    Filed: December 23, 1996
    Date of Patent: February 23, 1999
    Assignee: Enerfex, Inc.
    Inventor: Richard A. Callahan
  • Patent number: 5693121
    Abstract: A semi-permeable gas membrane process is described for the separation of very high purity nitrogen from a process feed gas mixture that is predominantly nitrogen, and one or more other permeable gases, which process comprises providing a feed gas mixture under pressure to a membrane separator unit comprising a semi-permeable separation membrane with respect to which the largest fraction of the other permeable gases is at least 20 times more permeable than nitrogen, to provide a very high purity raffinate nitrogen gas product.
    Type: Grant
    Filed: November 9, 1995
    Date of Patent: December 2, 1997
    Assignee: Enerfex, Inc.
    Inventors: Richard A. Callahan, Kishore V. Khandavalli
  • Patent number: 5482539
    Abstract: A membrane process and apparatus are described for the production of a desired very high purity permeate gas by use of a multiple stage membrane process wherein in a primary stage a process feed gas mixture is provided to a primary membrane separator unit comprising a membrane having a relatively high intrinsic permeability to provide an intermediate permeate gas and a retentate gas, and providing the intermediate permeate gas in a secondary stage to a secondary membrane separator unit comprising a membrane having a relatively low intrinsic permeability, to produce therefrom a very high purity permeate gas product.
    Type: Grant
    Filed: October 11, 1994
    Date of Patent: January 9, 1996
    Assignee: Enerfex, Inc.
    Inventor: Richard A. Callahan
  • Patent number: 5233837
    Abstract: A process for producing liquid carbon dioxide. A process stream which comprises carbon dioxide, balance substantially nitrogen and water, is cooled so that a minor amount of the water is condensed out. The process stream is compressed so that substantially all of the water but trace amounts is condensed out. Next, the process stream is cleaned to remove the trace amounts of water, any long-chain hydrocarbons present and any particulates present. The process stream is then separated into a nitrogen-rich gaseous stream and a carbon dioxide-rich gaseous stream. The carbon dioxide-rich gaseous stream is then compressed and the nitrogen-rich gaseous stream is expanded to produce an expanded nitrogen-rich gaseous stream. The energy of the expanding is used to compress the carbon dioxide-rich gaseous stream. The compressed carbon dioxide-rich gaseous stream is cooled to liquefy the carbon dioxide in the stream and reduce the temperature of the gaseous nitrogen in the stream.
    Type: Grant
    Filed: September 3, 1992
    Date of Patent: August 10, 1993
    Assignee: Enerfex, Inc.
    Inventor: Richard A. Callahan
  • Patent number: 5186941
    Abstract: Disclosed herein are vesicle compositions for controlled sustained release of an encapsulated therapeutic agent after parenteral administration. By adjusting the osmolarity between the suspending solution and the solution within the vesicles by adjusting the concentration of the suspending solution, the rate of release of the therapeutic agent after parenteral administration can be varied. The compositions can be effectively administered by intramuscular, subcutaneous injection or other means.
    Type: Grant
    Filed: November 18, 1991
    Date of Patent: February 16, 1993
    Assignee: Vestar, Inc.
    Inventors: Richard A. Callahan, George W. Tin
  • Patent number: 4724845
    Abstract: A method for determining metabolic status of any organism is disclosed. The method is based on determining the changes in rate of oxygen consumption as a function of varying stress levels, and particularly in response to varying the levels of ambient oxygen supply to the organism. Typically, the stress variation is imposed against a backdrop of constant second stress applied to the same organism.
    Type: Grant
    Filed: August 5, 1985
    Date of Patent: February 16, 1988
    Assignee: Vestar Research, Inc.
    Inventor: Richard A. Callahan
  • Patent number: PP28721
    Abstract: ‘RKD’ is a Gala-type apple tree distinguished by its early maturing and early full-coloring fruit.
    Type: Grant
    Filed: July 28, 2015
    Date of Patent: December 5, 2017
    Inventor: Richard Callahan