Patents by Inventor Rowland Allen Griffin

Rowland Allen Griffin 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).

  • Process for producing meltblown polyolefin fibers for mechanical filtration
    Patent number: 6139608
    Abstract: A process for producing meltblown polyolefin fibres having an effective diameter of less than 5 microns, comprising providing a polyolefin having a melt flow index of at least 1000, mixing a fluorochemical with the polyolefin in order to increase the melt flow index of the polyolefin to at least 2000, and meltblowing the polyolefin with the fluorochemical in order to produce the meltblown polyolefin fibres, and the polyolefin being such that during the meltblowing the fluorochemical is able to migrate to the surface of the formed polyolefin fibres without the need for a separate annealing step.
    Type: Grant
    Filed: November 6, 1998
    Date of Patent: October 31, 2000
    Assignee: Hunt Technology Limited
    Inventors: Timothy John Woodbridge, Rowland Allen Griffin