Granted Patent
Utility
US 5,727,792 · App. 08/634,166
Triple cartridge seal having one inboard and two concentric seals for chemical processing pump
Inventor:
Robert E. Rockwood
Patented Case
View Patent ↗
Granted: Mar 17, 1998
Filed: Apr 18, 1996
Inventor
Robert E. Rockwood
Assignee (at issue)
Environamics 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.