Patents by Inventor Walter W. Stewart

Walter W. Stewart 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).

  • Aminonaphthalimide dyes for intracellular labelling
    Patent number: 4473693
    Abstract: Fluorescent yellow dyes of the aminonaphthalimide type which have the following structures: ##STR1## In the formula above alk (alkali metal) may be substituted for Li.sup.+ and thus alk may be Li.sup.+, Na.sup.+, or K.sup.+, but the preferable structure is Li.sup.+. These dyes have shown superior activity in intracellular use in vivo in tissues such as turtle retina and wholemount tissue observation.
    Type: Grant
    Filed: August 4, 1978
    Date of Patent: September 25, 1984
    Inventor: Walter W. Stewart