Patents by Inventor Barry F. Briffa

Barry F. Briffa 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).

  • Patent number: 5814438
    Abstract: An ultraviolet absorbing compound of formula (I) below, and photographic elements containing such a compound as an ultraviolet absorber: ##STR1## wherein: R.sub.1 -R.sub.4 independently is a hydrogen atom, a halogen atom such as fluoro, chloro, bromo, iodo or a combination thereof; a carbalkoxy group having at least one asymmetric carbon or asymmetric silicon atom; an alkoxy group having at least one asymmetric carbon or asymmetric silicon atom, with the proviso that R.sub.2 or R.sub.3, or both R.sub.2 and R.sub.3 are other than hydrogen;A* is a group having a carbon atom directly attached to 2'-hydroxyphenyl ring at the 5'-position which contains at least one asymmetric carbon atom or an asymmetric silicon atom, and;wherein the ultraviolet absorbing compound of formula (I) is a mixture of two enantiomers about the asymmetric carbon or silicon atom of A*.
    Type: Grant
    Filed: February 13, 1997
    Date of Patent: September 29, 1998
    Assignee: Eastman Kodak Company
    Inventors: Lal C. Vishwakarma, Glenn M. Brown, Barry F. Briffa