Patents Assigned to Steadfast, Incorporated
  • Patent number: 5422382
    Abstract: Substituted xanthene compounds are described which are capable of functioning as absorbers in high intensity light protective compositions and in materials used to prevent the transmission of high intensity light at selected wavelengths. Also described are high intensity light protective compositions containing an effective amount of a substituted xanthene compound and a polymeric compound and a material which prevents transmission of high intensity light at wavelengths between about 482 to about 556 nanometers. The material of this invention can be used to make protective eyewear, optical filters, shields for protecting a persons body from high intensity light, or shields for protecting components of an optical instrument from high intensity light.
    Type: Grant
    Filed: June 16, 1992
    Date of Patent: June 6, 1995
    Assignee: Steadfast, Incorporated
    Inventors: Louis Locatell, Kenneth Norland, F. Donald Roberts, Charles Zepp
  • Patent number: 5326502
    Abstract: Metal complexes of pyridylbenzimidazoles are described which can be used as ultraviolet absorbers. The pyridylbenzimidazole compounds can be substituted or unsubstituted. The ultraviolet absorbers can be used to protect a carrier or to protect objects being shielded by a carrier.
    Type: Grant
    Filed: August 2, 1990
    Date of Patent: July 5, 1994
    Assignee: Steadfast, Incorporated
    Inventors: George R. Bird, Louis Locatell, Kenneth S. Norland, Louis M. Scarmoutzos