Patents by Inventor Selwyn Foster

Selwyn Foster 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).

  • Patent number: 6923646
    Abstract: There is disclosed a process and apparatus for withdrawing an exhaust stream including gas, liquids and solids from the dental operatory connected to the suction side of a vacuum pump wherein solids and liquids are sequentially removed such that compressed gas from the vacuum pump is passed through a heat exchanger for cooling, thus permitting the use of lightweight, less expensive conduit piping for a vent exhaust conduit.
    Type: Grant
    Filed: April 17, 2002
    Date of Patent: August 2, 2005
    Assignee: Air Techniques, Inc.
    Inventors: Henry Hubner, Elliot R. Gemunder, Selwyn Foster, Jr.
  • Patent number: 6638066
    Abstract: A dental vacuum system for use in dental operatories in which a dental aspirator tip in the dental operatory is in fluid communication with a two stage side channel blower for providing suction to the system, there being interposed between the dental aspirator tip and the two stage side channel blower, a solid debris collector and separation chamber for the passage of air and collection of effluent and debris, the air outlet port in the separation chamber having a float valve sealing means, the float valve sealing means having a pivotal lever with a sealing means at one end for engagement with the air outlet port and a float at the opposing lever end for contact with a fluid or foam level within the separation tank, the float depending from the lever end a sufficient distance so as to cause the sealing means to seal the outlet port before any foam can exit the separation tank.
    Type: Grant
    Filed: January 4, 2002
    Date of Patent: October 28, 2003
    Assignee: Air Techniques, Inc.
    Inventors: Henry Hubner, Edgar Alzner, Selwyn Foster, Jr.
  • Publication number: 20030198919
    Abstract: There is disclosed a process and apparatus for withdrawing an exhaust stream including gas, liquids and solids from the dental operatory connected to the suction side of a vacuum pump wherein solids and liquids are sequentially removed such that compressed gas from the vacuum pump is passed through a heat exchanger for cooling, thus permitting the use of lightweight, less expensive conduit piping for a vent exhaust conduit.
    Type: Application
    Filed: April 17, 2002
    Publication date: October 23, 2003
    Inventors: Henry Hubner, Elliot R. Gemunder, Selwyn Foster
  • Publication number: 20030129561
    Abstract: A dental vacuum system for use in dental operatories in which a dental aspirator tip in the dental operatory is in fluid communication with a two stage side channel blower for providing suction to the system, there being interposed between the dental aspirator tip and the two stage side channel blower, a solid debris collector and separation chamber for the passage of air and collection of effluent and debris, the air outlet port in the separation chamber having a float valve sealing means, the float valve sealing means having a pivotal lever with a sealing means at one end for engagement with the air outlet port and a float at the opposing lever end for contact with a fluid or foam level within the separation tank, the float depending from the lever end a sufficient distance so as to cause the sealing means to seal the outlet port before any foam can exit the separation tank.
    Type: Application
    Filed: January 4, 2002
    Publication date: July 10, 2003
    Inventors: Henry Hubner, Edgar Alzner, Selwyn Foster