Granted Patent
Utility
US 4,753,285 · App. 07/034,997
Parallel piping installation with air by-pass apparatus
Inventor:
John P. Rawlings
Patented Case
View Patent ↗
Granted: Jun 28, 1988
Filed: Apr 6, 1987
Inventor
John P. Rawlings
Assignee (at issue)
Command-Aire 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.