Granted Patent
Utility
US 4,918,005 · App. 07/074,745
Method of quantitative assay for vitamin B.sub.12 and reagent for assaying vitamin B.sub.12
Inventors:
Asao Murai, Masao Yamamoto
Patented Case
View Patent ↗
Granted: Apr 17, 1990
Filed: Jul 17, 1987
Inventors
Asao Murai
Masao Yamamoto
Assignee (at issue)
Sanraku Incorporated
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.