Patents by Inventor Joseph G. Zahka

Joseph G. Zahka 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).

  • Package for membrane filters
    Patent number: 4727705
    Abstract: A hydrophobic membrane filter device is packaged in a moisture and bacteria impervious container with the pores of the membrane filter being filled with water. The package is then sterilized to kill any living organisms contained therein. Thereafter, a sufficient concentration of water is retained in the membrane pores thereby rendering the hydrophobic membrane filter device directly permeable to an aqueous fluid.
    Type: Grant
    Filed: December 4, 1986
    Date of Patent: March 1, 1988
    Assignee: Millipore Corporation
    Inventor: Joseph G. Zahka
  • Rain retardant screen
    Patent number: 4017282
    Abstract: A device is presented which prevents rain drops from penetrating and which allows light and gas to be transmitted in a rain-free environment. The device is a screen assembly whose outer surface (toward outdoors) has a contact angle with water of greater than 90.degree. and whose inner surface has a contact angle with water of less than 90.degree..
    Type: Grant
    Filed: May 22, 1975
    Date of Patent: April 12, 1977
    Inventors: Joseph G. Zahka, Ruthven H. Daniels