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
  • Thermoplastic hydrogels
    Patent number: 4064086
    Abstract: Thermoplastic hydrogels are prepared by making condensation polymers of spirolactones of the formula: ##STR1## with a difunctional compound capable of opening the lactone rings. The thermoplastic hydrogels can be cross-linked. In the formula the total of n and m and also of n' and m' is 2 to 5 and the R groups are H or hydrocarbyl with not over 3 R groups being hydrocarbyl. Most preferably all R groups are H and n, m, n' and m' are all 1.
    Type: Grant
    Filed: July 13, 1976
    Date of Patent: December 20, 1977
    Assignee: National Patent Development Corporation
    Inventors: Donald Roy Cowsar, Albert Charles Tanquary