Patents by Inventor A. Charles Tanquary

A. Charles Tanquary 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).

  • Spinning of polypyrrolidone
    Patent number: 4094945
    Abstract: Polypyrrolidone solutions having a bulk viscosity of 100-10,000 poises, and containing a solvent such as formic acid and a volatile diluent such as methylene chloride, are spun into filaments by extrusion through a spinneret. The solution contains, for example, about 5-40 weight percent of polypyrrolidone, about 30-90 weight percent of formic acid and about 5-60 weight percent of methylene chloride.
    Type: Grant
    Filed: August 16, 1976
    Date of Patent: June 13, 1978
    Assignee: Chevron Research Company
    Inventor: A. Charles Tanquary