Granted Patent
Utility
US 5,887,587 · App. 08/350,647
Facial mask for respiratory apparatus
Inventor:
Allen W. Groenke
Patented Case
View Patent ↗
Granted: Mar 30, 1999
Filed: Dec 7, 1994
Inventor
Allen W. Groenke
Assignee (at issue)
Edentec 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.