Granted Patent
Utility
US 4,429,103 · App. 06/360,000
Method for preparation of aromatic polyester-polycarbonate
Inventors:
Katsuhisa Kohyama, Katsuyuki Sakata, Shinji Ono
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Mar 19, 1982
Inventors
Katsuhisa Kohyama
Katsuyuki Sakata
Shinji Ono
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.