Patents Assigned to Redwood Rubber LLC
  • Process for use of crumb rubber in moldable formulations
    Patent number: 6579482
    Abstract: Roofing tiles, sheet rubber, and other rubber-based articles are formed from devulcanized crumb rubber by compounding the rubber with sulfur, a compound containing bound water, and a flame retardant. The articles have a high rubber content and are moldable and formable without the need for added polymeric binders, and are self-extinguishing upon exposure to flame.
    Type: Grant
    Filed: May 8, 2000
    Date of Patent: June 17, 2003
    Assignee: Redwood Rubber LLC
    Inventors: Thomas Faust, Fridrikh S. Diatchkovski, Gretchen Faust, Dmitri F. Diatchkovski
  • Magnetostriction-based ultrasound in rubber devulcanization and related processes
    Patent number: 6545060
    Abstract: The breakdown of crosslinked elastomers, including the devulcanization of crumb rubber, is achieved by exposing the elastomers to ultrasonic vibrations induced by magnetostriction transducers. The transducers are capable of a higher power output than ultrasound produced by piezoelectric transducers, and are able to withstand high temperatures and high-frequency vibrations to a significantly better degree.
    Type: Grant
    Filed: October 5, 2000
    Date of Patent: April 8, 2003
    Assignee: Redwood Rubber LLC
    Inventors: Andrey Aleksandrovich Ruhman, Vsevolod Fedosievich Kasanzev, Vyacheslav Nikolaevich Alenitchev, Sergei Aleksandrovich Neduzhiy, Tom Faust