Granted Patent
Utility
US 4,568,481 · App. 06/580,970
Extension of gelation time of crosslinked polygalactomannans
Inventor:
William F. Harris
Patented Case
View Patent ↗
Granted: Feb 4, 1986
Filed: Feb 16, 1984
Inventor
William F. Harris
Assignee (at issue)
Celanese GmbH
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.