Granted Patent
Utility
US 5,132,159 · App. 07/507,825
Substantially flat surfaced vinyl polymer emulsion particles having a concavity and process for preparing them
Inventors:
Futoshi Hoshino, Makoto Nakano, Takeshi Yanagihara
Patented Case
View Patent ↗
Granted: Jul 21, 1992
Filed: Apr 12, 1990
Inventors
Futoshi Hoshino
Makoto Nakano
Takeshi Yanagihara
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.