Granted Patent
Utility
US 4,844,809 · App. 06/799,059
Method for purifying reaction solution obtained by using microbial cell, immobilized microbial cell, or immobilized enzyme
Inventors:
Ashina Yoshiro, Yasumasa Yamaguchi, Masashi Nishida, Toshiaki Doi
Patented Case
View Patent ↗
Granted: Jul 4, 1989
Filed: Nov 18, 1985
Inventors
Ashina Yoshiro
Yasumasa Yamaguchi
Masashi Nishida
Toshiaki Doi
Assignee (at issue)
Nitto Chemical Industry 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.