Granted Patent
Utility
US 4,413,843 · App. 06/107,066
Microcapsules, method for their production and pressure sensitive copying sheet
Inventors:
Hiroshi Iwasaki, Shinsuke Irii
Patented Case
View Patent ↗
Granted: Nov 8, 1983
Filed: Dec 26, 1979
Inventors
Hiroshi Iwasaki
Shinsuke Irii
Assignee (at issue)
Kanzaki Paper Manufacturing Co., Ltd.
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.