Patents by Inventor Philip E. Stevenson

Philip E. Stevenson 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).

  • Process to form amorphous, crystallizable thermoplastic polymers
    Patent number: 4508769
    Abstract: A method of forming an amorphous crystallizable thermoplastic polymer composition. The polymer composition has a modulus of rigidity which decreases to a minimum value with increasing temperature and then begins to increase. The process includes heating polymer to below a temperature at which crystal formation occurs and form the polymer. The polymer composition is then heated to a temperature at which crystal formation can occur and be annealed. This process is useful to make articles having a thickness of from 0.127 cm (0.050 inches) to 1.27 cm (0.50 inches) such as sheets and tubes of the amorphous polymer and then reforming and annealing them.
    Type: Grant
    Filed: February 15, 1984
    Date of Patent: April 2, 1985
    Assignee: Allied Corporation
    Inventors: Nicholas Vanderkooi, Jr., Philip E. Stevenson, Robert J. Welgos
  • Process to form amorphous, crystallizable thermoplastic polymers
    Patent number: 4455417
    Abstract: A method of forming an amorphous crystallizable thermoplastic polymer composition. The polymer composition has a modulus of rigidity which decreases to a minimum value with increasing temperature and then begins to increase. The process includes heating polymer to below a temperature at which crystal formation occurs and form the polymer. The polymer composition is then heated to a temperature at which crystal formation can occur and be annealed. This process is useful to make articles having a thickness of from 0.127 cm (0.050 inches) to 1.27 cm (0.50 inches) such as sheets and tubes of the amorphous polymer and then reforming and annealing them.
    Type: Grant
    Filed: July 6, 1982
    Date of Patent: June 19, 1984
    Assignee: Allied Corporation
    Inventors: Nicholas Vanderkooi, Jr., Philip E. Stevenson, Robert J. Welgos