Patents by Inventor Zahidah Mohamed Zain

Zahidah Mohamed Zain 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).

  • Vapor-liquid equilibrium and interfacial tension measuring apparatus and method
    Patent number: 5653250
    Abstract: An apparatus and method for facilitating the attainment of thermodynamic equilibrium and for measurement of interfacial tension of mixtures. A fixed volume chamber is connected at an upper end face and lower wall portion of the chamber to a first variable volume chamber and at a lower end face and upper wall portion of the chamber to a second variable volume chamber. Conduit valves and a valve controller control the flow of mixtures between the first and second variable volume chambers and the fixed volume chamber to selectively cause more dense component of the mixture to flow through less dense component of the mixture and less dense component of the mixture to flow through more dense component of the mixture, the flow through occurring within the fixed volume chamber.
    Type: Grant
    Filed: July 28, 1995
    Date of Patent: August 5, 1997
    Inventors: Phillip Sigmund, Zahidah Mohamed Zain, Dawood Mohamed Anwar Raja, Muhammad Ekrami Daud