Granted Patent
Utility
US 4,683,288 · App. 06/751,671
Polymer and its production
Inventors:
Motoaki Tanaka, Yasuaki Ogawa, Tsutomu Miyagawa, Toshio Watanabe
Patented Case
View Patent ↗
Granted: Jul 28, 1987
Filed: Jul 3, 1985
Inventors
Motoaki Tanaka
Yasuaki Ogawa
Tsutomu Miyagawa
Toshio Watanabe
Assignees (at issue)
Waco Pure Chemical Ind. Inc.
Takeda Chemical Industries 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.