Granted Patent
Utility
US 4,618,586 · App. 06/483,284
Apparatus for administering a controlled dosage of a chemical substance having an improved culture chamber
Inventor:
Robert D. Walker
Patented Case
View Patent ↗
Granted: Oct 21, 1986
Filed: Apr 8, 1983
Inventor
Robert D. Walker
Assignee (at issue)
Endotronics, 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.