Patents Assigned to Cygnus Corporation
  • Polyanhydroaspartic acid and method of dry manufacture of polymers
    Patent number: 5219986
    Abstract: The invention is a process of manufacture, and a product manufactured by that process. The process comprises various steps. The steps include charging aspartic acid particles into a process unit and heating those particles to approximately 400.degree.-480.degree. F. As the aspartic acid particles are heated, vacuum is applied to that unit. Water is removed from the aspartic acid to form polyanhydroaspartic acid.
    Type: Grant
    Filed: October 28, 1991
    Date of Patent: June 15, 1993
    Assignee: Cygnus Corporation
    Inventor: Thomas A. Cassata
  • Resilient transdermal drug delivery device
    Patent number: 5006342
    Abstract: A solid state, resilient laminated composite for administering a drug transdermally consisting of a multiplicity of spaced structural laminas of a resilient elastomer, one of which forms the top of the composite, a viscoelastic hydrophobic polymer lamina containing propylene glycol monolaurate interposed between each structural lamina and a pressure-sensitive adhesive lamina that provides the basal surface of the composite and consists of a blend of a pressure-sensitive adhesive, drug and propylene glycol monolaurate.
    Type: Grant
    Filed: February 10, 1989
    Date of Patent: April 9, 1991
    Assignee: Cygnus Corporation
    Inventors: Gary W. Cleary, Samir Roy