Granted Patent
Utility
US 4,775,739 · App. 07/055,352
Process for producing polycarbonate resin with tertiary alryl phenol molecular weight modifier
Inventors:
Masayoshi Hasuo, Hiroshi Urabe, Masahiro Nukui
Patented Case
View Patent ↗
Granted: Oct 4, 1988
Filed: May 29, 1987
Inventors
Masayoshi Hasuo
Hiroshi Urabe
Masahiro Nukui
Assignee (at issue)
Mitsubishi Chemical Industries, 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.