Patents by Inventor John Edward Tomaschke

John Edward Tomaschke 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).

  • Low pressure reverse osmosis and nanofiltration membranes and method for the production thereof
    Patent number: 7001518
    Abstract: Novel low pressure reverse osmosis and nanofiltration membranes and a process for their preparation are disclosed. Polyamide reverse osmosis membranes are contacted with organic sulfonic acid solutions without the need for additional treatment by a rejection enhancing agent. These membranes provide sodium chloride rejections of greater than 20 percent and water fluxes greater than 15 gallons per square foot per day at a test pressure of 75 psi. Optimally treated membranes when tested similarly on 0.2 percent magnesium sulfate provide rejections greater than 95 percent with water fluxes greater than 15 gallons per square foot per day.
    Type: Grant
    Filed: November 28, 2000
    Date of Patent: February 21, 2006
    Assignee: Hydranautics
    Inventor: John Edward Tomaschke