Patents by Inventor Rafael E. Guerra

Rafael E. Guerra 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).

  • Removal of metals from solutions
    Patent number: 4747954
    Abstract: Particles, fibers, or filaments of ethylene/carboxylic acid copolymers or terpolymers, especially in highly porous or microporous form, are employed in removing contaminants from solution in aqueous and/or organic liquids, especially metal contaminants. The porous polymers, having a surface area/weight ratio of at least about 0.5 m.sup.2 /gm, are useful alone, but may also be used in conjunction with, or in tandem with, previously known ion exchange resins such as polyacrylic acid crosslinked with divinylbenzene.
    Type: Grant
    Filed: September 16, 1985
    Date of Patent: May 31, 1988
    Assignee: The Dow Chemical Company
    Inventors: Walter L. Vaughn, Rafael E. Guerra
  • Polymerization of olefins in the presence of chromium-containing catalysts
    Patent number: 4380616
    Abstract: Olefins are polymerized in the presence of chromium-containing catalysts which have been improved by depositing the chromium onto the inorganic oxide support in the vapor phase rather than as an inorganic or organic compound. The resulting polymers exhibit a higher molecular weight as compared to those polymers prepared in the presence of such chromium-containing catalysts prepared in the conventional manner.
    Type: Grant
    Filed: May 14, 1981
    Date of Patent: April 19, 1983
    Assignee: The Dow Chemical Company
    Inventors: Fred L. Vance, Jr., Rafael E. Guerra, Christopher P. Christenson
  • Chromium-containing catalysts for polymerizing olefins
    Patent number: 4362654
    Abstract: Inorganic oxide supported chromium-containing catalysts are improved by depositing the chromium onto the inorganic oxide support in the vapor phase rather than as an inorganic or organic compound. Polymers resulting from polymerizing one or more .alpha.-olefins in the presence of such catalysts exhibit a higher molecular weight as compared to those polymers prepared in the presence of such chromium-containing catalysts prepared in the conventional manner.
    Type: Grant
    Filed: May 14, 1981
    Date of Patent: December 7, 1982
    Assignee: The Dow Chemical Company
    Inventors: Fred L. Vance, Jr., Rafael E. Guerra, Christopher P. Christenson