Granted Patent
Utility
US 5,554,695 · App. 08/433,966
Styrenic copolymer and process for producing same
Inventors:
Shuji Machida, Toshinori Tazaki
Patented Case
View Patent ↗
Granted: Sep 10, 1996
Filed: May 4, 1995
Inventors
Shuji Machida
Toshinori Tazaki
Assignee (at issue)
IDEMITSU KOSAN 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.