Granted Patent
Utility
US 4,909,380 · App. 06/689,885
Low backline pressure chain
Inventor:
Wasyly G. Hodlewsky
Patented Case
View Patent ↗
Granted: Mar 20, 1990
Filed: Jan 9, 1985
Inventor
Wasyly G. Hodlewsky
Assignee (at issue)
REXNORD 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.