Granted Patent
Utility
US 4,776,972 · App. 06/834,366
Adjustable strength laundry bleaching using a two compartment package
Inventor:
John H. Barrett
Patented Case
View Patent ↗
Granted: Oct 11, 1988
Filed: Feb 28, 1986
Inventor
John H. Barrett
Assignee (at issue)
PUREX CO., 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.