Granted Patent
Utility
US 4,428,585 · App. 06/369,044
Permeable membrane seal assembly
Inventor:
Richard H. Dugge
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Apr 16, 1982
Inventor
Richard H. Dugge
Assignee (at issue)
ACF Industries Incorporated
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.