Granted Patent
Utility
US 5,292,533 · App. 07/858,130
Controlled release microcapsules
Inventors:
William A. McMahon, Chel W. Lew, Keith Branly
Patented Case
View Patent ↗
Granted: Mar 8, 1994
Filed: Mar 27, 1992
Inventors
William A. McMahon
Chel W. Lew
Keith Branly
Assignee (at issue)
Micro Flo Company
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.