Patents by Inventor Iosif Chernyakov

Iosif Chernyakov 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).

  • Recovery of perfluorinated compounds from the exhaust of semiconductor fabs with recycle of vacuum pump diluent
    Patent number: 6032484
    Abstract: A method for the separation and recovery of fluorochemicals from a gas stream containing a diluent gas and fluorochemicals by first contacting the gas stream with a membrane system in one or more stages where the membrane(s) is selectively more permeable to the diluent gas than the fluorochemicals to result in a permeate stream rich in diluent gas and retentate rich in fluorochemicals, thereafter subjecting retentate the gas stream to a purification by distillation or adsorption resulting in a product stream enriched in fluorochemicals and a purified diluent stream. The purified diluent stream is used as a purge stream and/or a recycle stream together with the permeate stream to a vacuum pump upstream of the membrane separation step.
    Type: Grant
    Filed: March 23, 1998
    Date of Patent: March 7, 2000
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Iosif Chernyakov, Thomas Hsiao-Ling Hsiung, Alexander Schwarz, James Hsu-Kuang Yang
  • Recovery of perfluorinated compounds from the exhaust of semiconductor fabs using membrane and adsorption in series
    Patent number: 5976222
    Abstract: A process for the separation and recovery of fluorochemicals from a gas stream containing a diluent gas and fluorochemicals by contact of the gas stream with a membrane system in combination with an adsorption system, the adsorption system used either before or after the membrane system.
    Type: Grant
    Filed: March 23, 1998
    Date of Patent: November 2, 1999
    Assignee: Air Products and Chemicals, Inc.
    Inventors: James Hsu-Kuang Yang, Iosif Chernyakov, Thomas Hsiao-Ling Hsiung, Alexander Schwarz
  • Fluorochemical recovery and recycle using membranes
    Patent number: 5730779
    Abstract: A method for the separation and recovery of fluorochemicals from a gas stream containing a diluent gas and fluorochemicals by contact of the gas stream with a membrane, comprising the steps of: compressing a gas stream containing a diluent gas and fluorochemicals to an elevated pressure; heating the gas stream containing a diluent gas and fluorochemicals to an elevated temperature sufficient to increase the flux of the permeate stream and to increase the selectivity of the membrane for the permeation of the diluent gas relative to the permeation of the fluorochemicals; contacting the gas stream with a membrane which is selectively more permeable to the diluent gas than the fluorochemicals to result in a permeate stream rich in the diluent gas and a retentate rich in fluorochemicals; contacting the gas stream with one or more additional membranes which are selectively more permeable to the diluent gas than the fluorochemicals to result in a second permeate stream rich in the diluent gas and a second retentate
    Type: Grant
    Filed: October 31, 1996
    Date of Patent: March 24, 1998
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Iosif Chernyakov, Thomas Hsiao-Ling Hsiung, Alexander Schwarz, James Hsu-Kuang Yang