Patents by Inventor Ali Akbar Yousefi

Ali Akbar Yousefi 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).

  • Patent number: 6359033
    Abstract: A paving composition comprises a mixture of about 90 to 99.5 wt. % of an asphaltic material and about 0.5 to 10 wt. % of solid particles each encapsulated with a cross-linked polymer, the encapsulated particles being uniformly dispersed in the asphaltic material. The encapsulated particles have a particle-to-polymer weight ratio so as to provide a density match between the encapsulated particles and the asphaltic material. The paving composition according to the invention has a higher complex viscosity at high temperatures (60° C.) and is more ductile at low temperatures (−15° C.) in comparison with the base asphaltic material. Moreover, the composition is completely stable at elevated temperatures (160° C.) or during long periods of storage.
    Type: Grant
    Filed: July 17, 2000
    Date of Patent: March 19, 2002
    Assignee: Universite Laval, Cite Universitaire
    Inventors: Abdellatif Ait-Kadi, Ali Akbar Yousefi