Patents Examined by Chukwurah H Nathaniel
  • Storage stabilized oxygen degradable polymer
    Patent number: 6418702
    Abstract: This invention concerns a stabilized packaging environment for a particulate vinyl lactam polymer, particularly polyvinylpyrrolidone particles, which comprises a sealed, oxygen-impervious receptacle containing the polymer particles and a separate air permeable package within the receptacle containing a water moistened oxygen scavenging agent, preferably iron powder, an iron (II) salt, ascorbic acid or a mixture of such agents.
    Type: Grant
    Filed: July 23, 2001
    Date of Patent: July 16, 2002
    Assignee: ISP Investments Inc.
    Inventors: Chi-San Wu, Laurence Senak, Donna Osborne, James F. Curry, Charles B. Schriver, Irwin B. Silverstein