Granted Patent
Utility
US 4,859,652 · App. 07/121,018
Method for preparation of high temperature superconductors using trichloroacetates
Inventor:
Jacob Block
Patented Case
View Patent ↗
Granted: Aug 22, 1989
Filed: Nov 16, 1987
Inventor
Jacob Block
Assignee (at issue)
W.R. Grace & Co. Conn.
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.