Patents by Inventor Charles Howard Sparks, deceased

Charles Howard Sparks, deceased 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).

  • Compliant mandrel and mandrel assembly for growing graft tubes
    Patent number: 3938524
    Abstract: A mandrel of sponge rubber or gel has a tension element for withdrawing the mandrel from a graft tube grown from living tissue. In a first embodiment the tension element comprises a strip of cloth embedded in a sponge rubber mandrel. In a second embodiment the tension element comprises a rubber tube containing the sponge rubber and in a third embodiment the tension element comprises a rubber tube containing a gel. The mandrel assembly includes cloth reinforcing tubes surrounding the mandrel.
    Type: Grant
    Filed: September 16, 1974
    Date of Patent: February 17, 1976
    Inventors: Charles Howard Sparks, deceased, by Margaret J. Sparks, executrix