Granted Patent
Utility
US 4,604,763 · App. 06/703,050
Seal means for a flush valve assembly
Inventor:
Richard W. Sprang
Patented Case
View Patent ↗
Granted: Aug 12, 1986
Filed: Feb 19, 1985
Inventor
Richard W. Sprang
Assignee (at issue)
Clevepak Corporation
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.