Patents by Inventor David Parpart

David Parpart 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).

  • Non-whistling vent tube
    Publication number: 20060213567
    Abstract: A non-whistling corrugated tube is provided having a plurality of rib segments interleaved between a plurality of root segments. Each of the rib segments include a pair of axially converging sidewalls intersecting with an apex wall. The geometry of the tube is such that the rib-to-root volume ratio is in the range of 0.1 to 0.2. Corrugated tubes having these geometric configurations have been found to be superior to conventional corrugated tubing for attenuating airborne noise generated by fluid flow therethrough, i.e., whistling.
    Type: Application
    Filed: March 25, 2005
    Publication date: September 28, 2006
    Inventors: David Parpart, Kevin Baxter, C. Thielen