Granted Patent
Utility
US 5,527,870 · App. 08/370,386
Process for the preparation of isobutylene polymer
Inventors:
Takuya Maeda, Hideo Kawachi, Masanobu Tamura, Shun Wachi
Patented Case
View Patent ↗
Granted: Jun 18, 1996
Filed: Jan 10, 1995
Inventors
Takuya Maeda
Hideo Kawachi
Masanobu Tamura
Shun Wachi
Assignee (at issue)
Kanagafuchi Kagaku Kogyo Kabushiki Kaisha
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.