Granted Patent
Utility
US 4,937,330 · App. 07/038,791
Conversion of cephalosporin hydrohalide salt to alkali metal salt
Inventors:
Clifford E. Sacks, Loren H. Dill
Patented Case
View Patent ↗
Granted: Jun 26, 1990
Filed: Apr 10, 1987
Inventors
Clifford E. Sacks
Loren H. Dill
Assignee (at issue)
The Upjohn Co.
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.