Granted Patent
Utility
US 4,452,989 · App. 06/384,137
Substantive moisturizing derivatives of 2-pyrrolidone-5-carboxylic acid and compositions containing same
Inventors:
George Endel Deckner, Hedwig O'Grady, Albert Zofchak
Patented Case
View Patent ↗
Granted: Jun 5, 1984
Filed: Jun 1, 1982
Inventors
George Endel Deckner
Hedwig O'Grady
Albert Zofchak
Assignee (at issue)
Charles of the Ritz Group Ltd.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.