Patents by Inventor Patrick Joseph Jefferies

Patrick Joseph Jefferies 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).

  • Storage stable concentrated aqueous solutions of aminomethylated phthalocyanines
    Patent number: 4081239
    Abstract: Storage-stable aqueous compositions containing dissolved water-soluble methanesulfonic acid addition salts or mixed methanesulfonic acid-hydrochloric acid addition salts of poly(aminomethylated) metal phthalocyanines, which are prepared by the interaction of methanesulfonic acid and poly(aminomethylated) metal phthalocyanines, are useful for direct dyeing, particularly the dyeing of cellulose.
    Type: Grant
    Filed: August 6, 1976
    Date of Patent: March 28, 1978
    Assignee: Sterling Drug Inc.
    Inventor: Patrick Joseph Jefferies