Granted Patent
Utility
US 6,515,083 · App. 09/788,525
Process for producing isobutylene block copolymer
Inventors:
Shinji Ozawa, Toshinobu Nakata, Tomoki Hiiro, Taizo Aoyama
Patented Case
View Patent ↗
Granted: Feb 4, 2003
Filed: Feb 21, 2001
Inventors
Shinji Ozawa
Toshinobu Nakata
Tomoki Hiiro
Taizo Aoyama
Assignee (at issue)
KANEKA CORPORATION
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.