Patents by Inventor Frank E. Greenawalt

Frank E. Greenawalt 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).

  • Centrifugal electrospinning process
    Patent number: 9988742
    Abstract: The present disclosure provides a fiber-forming process that includes: providing a centrifugal electrospinning apparatus that includes: an emitter that includes a rotating element having a rotational speed of 10,000 rpm or less; and a collector; and providing a spinning solution including at least one polymer dissolved in at least one solvent; supplying the spinning solution to the emitter; and directing the spinning solution from the emitter toward the collector under conditions effective to form separate fibrous streams from the spinning solution, vaporize the solvent, and produce polymeric fibers on the collector.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: June 5, 2018
    Assignee: Donaldson Company, Inc.
    Inventor: Frank E. Greenawalt
  • CENTRIFUGAL ELECTROSPINNING PROCESS
    Publication number: 20160047062
    Abstract: The present disclosure provides a fiber-forming process that includes: providing a centrifugal electrospinning apparatus that includes: an emitter that includes a rotating element having a rotational speed of 10,000 rpm or less; and a collector; and providing a spinning solution including at least one polymer dissolved in at least one solvent; supplying the spinning solution to the emitter; and directing the spinning solution from the emitter toward the collector under conditions effective to form separate fibrous streams from the spinning solution, vaporize the solvent, and produce polymeric fibers on the collector.
    Type: Application
    Filed: April 11, 2014
    Publication date: February 18, 2016
    Inventor: Frank E. Greenawalt