Granted Patent
Utility
US 4,026,685 · App. 05/641,248
Flow reversing regenerative air dryer
Inventor:
Arthur R. Grix
Patented Case
View Patent ↗
Granted: May 31, 1977
Filed: Dec 16, 1975
Inventor
Arthur R. Grix
Assignee (at issue)
Wagner Electric 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.