Patents by Inventor Clarence C. Campbell

Clarence C. Campbell 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).

  • Alpha methyl styrene and vinyl toluene and processes of preparation
    Patent number: 3956250
    Abstract: The specification discloses resinous compositions comprising copolymers of alpha methyl styrene and vinyl toluene, 95 percent by weight of said copolymers having molecular chain lengths less than 100 Angstroms. The compositions are characterized by softening points in the range of about 10 to 98.degree.C and good solubility in paraffin wax. Processes are disclosed for preparing said compositions by copolymerizing mixtures of monomers of vinyl toluene and alpha methyl styrene in a weight ratio in the range of 2.5:1 to 4.5:1 in the presence of an acid clay catalyst.
    Type: Grant
    Filed: June 26, 1972
    Date of Patent: May 11, 1976
    Assignee: Hercules Incorporated
    Inventors: Clarence C. Campbell, Dean A. Finfinger