Patents by Inventor Richard C. Weil

Richard C. Weil 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).

  • Biodeteriable plastics and blends
    Patent number: 5026745
    Abstract: Improved mechanical properties have been obtained in a biodeteriable polypropylene by mixing starch with a polypropylene modified with maleic anhydride.
    Type: Grant
    Filed: June 12, 1989
    Date of Patent: June 25, 1991
    Assignee: Aristech Chemical Corporation
    Inventor: Richard C. Weil
  • Gasoline tank of tin-free (electroplate chrome-chrome oxide coated) steel coated with a maleic anhydride modified polypropylene
    Patent number: 4824736
    Abstract: A tin-free steel gasoline tank coated with a maleic anhydride modified polypropylene or ethylene propylene impact copolymer made by reactive processing is described. The coating exhibits good adhesion to the steel and the tank is resistant to attack by gasoline-alcohol mixtures and water which may condense in the tank.
    Type: Grant
    Filed: September 23, 1987
    Date of Patent: April 25, 1989
    Assignee: Aristech Chemical Corporation
    Inventors: Raymond J. Ehrig, Richard C. Weil
  • Controlled-rheology polypropylene
    Patent number: 4707524
    Abstract: Small amounts of peroxides which do not decompose to TBA and which have a half-life in the range of about 1.0 to 10 hrs. at 128.degree. C. are incorporated in polypropylene by thermal mechanical melting in an extruder. Control of molecular weight and molecular weight distribution is achieved as a function of the amount of peroxide added. The peroxides of choice are 2,2 di(t-amyl) peroxy propane and 3,6,6,9,9 pentamethyl-3 n-propyl-1,2,4,5 tetraoxacyclononane.
    Type: Grant
    Filed: May 6, 1986
    Date of Patent: November 17, 1987
    Assignee: Aristech Chemical Corporation
    Inventors: Raymond J. Ehrig, Richard C. Weil
  • Method of removing polybutadiene gels from solutions
    Patent number: 4230835
    Abstract: Solutions of polybutadiene in styrene are filtered through filter media of viscose rayon to remove and/or eliminate gels of sizes greater than about fifty microns.
    Type: Grant
    Filed: February 12, 1979
    Date of Patent: October 28, 1980
    Assignee: United States Steel Corporation
    Inventor: Richard C. Weil
  • Tar acid products from solvent naphtha
    Patent number: 4034048
    Abstract: Solvent naphtha is hydrogenated over an alumina-supported cobalt molybdate or nickel molybdate catalyst to produce tar-acid products.
    Type: Grant
    Filed: November 15, 1971
    Date of Patent: July 5, 1977
    Assignee: United States Steel Corporation
    Inventors: Norman S. Boodman, Richard C. Weil
  • Manufacture of thermoplastic resin beads
    Patent number: 4013550
    Abstract: In the manufacture of thermoplastic resin particles by polymerization, size classification by screening of polymerized particles at rates from 27 to 69-lbs/hr-ft.sup.2 is improved by the use of solid finely divided phosphates and carbonates in amounts of from 500 to 3000 ppm of such salts provided that this amount is above the breakdown point in classification of the particles for such rates of screening.
    Type: Grant
    Filed: July 22, 1975
    Date of Patent: March 22, 1977
    Assignee: United States Steel Corporation
    Inventor: Richard C. Weil