Granted Patent
Utility
US 4,836,093 · App. 06/881,757
Piston assembly
Inventor:
Daniel Wagner
Patented Case
View Patent ↗
Granted: Jun 6, 1989
Filed: Jul 3, 1986
Inventor
Daniel Wagner
Assignee (at issue)
American Standard Inc.
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.