Granted Patent
Utility
US 4,614,528 · App. 06/747,878
Dry air breather assembly
Inventor:
James W. Lennen
Patented Case
View Patent ↗
Granted: Sep 30, 1986
Filed: Jun 24, 1985
Inventor
James W. Lennen
Assignee (at issue)
SYSTEM DEVELOPMENT 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.