Granted Patent
Utility
US 4,643,764 · App. 06/696,972
Multiple types of microcapsules and their production
Inventor:
Herbert B. Scher
Patented Case
View Patent ↗
Granted: Feb 17, 1987
Filed: Jan 31, 1985
Inventor
Herbert B. Scher
Assignee (at issue)
Stauffer Chemical 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.