Patents by Inventor Martha Hetzel Robertson

Martha Hetzel Robertson 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).

  • Tackifiers and a process to obtain tackifiers
    Patent number: 5874512
    Abstract: Resins which are the copolymers of an alpha-olefin, a cyclic olefin, and an aromatic-group-containing monomer are provided. The cyclic olefins retain their cyclic structures and the aromatic-group-containing monomers retain their aromatic structures after copolymerization into the resin product. Methods for production of the new resins in the presence of a metallocene catalyst system are also provided. New adhesive compositions containing the resin and articles using the new adhesive compositions are also part of the invention.
    Type: Grant
    Filed: September 18, 1997
    Date of Patent: February 23, 1999
    Inventors: James McCleod Farley, Martha Hetzel Robertson, Charles Lewis Sims
  • Tackifiers and a process to obtain tackifiers
    Patent number: 5652308
    Abstract: Novel tackifier resins having a M.sub.n of 5,000 or less and a T.sub.g of 0.degree. C. or above are produced by combining a metallocene catalyst with an alpha-olefin and a cyclic monomer. New adhesives are produced by blending the novel tackifier with a base polymer.
    Type: Grant
    Filed: July 21, 1995
    Date of Patent: July 29, 1997
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Natalie Ann Merrill, James McLeod Farley, Martha Hetzel Robertson, Charles Lewis Sims, Richard Byron Pannell, Angelo Anthony Montagna