Granted Patent
Utility
US 4,546,172 · App. 06/568,422
Process for producing polycarbonate resin particles
Inventors:
Katsuhisa Kohyama, Akira Matsuno, Kenji Tsuruhara
Patented Case
View Patent ↗
Granted: Oct 8, 1985
Filed: Jan 5, 1984
Inventors
Katsuhisa Kohyama
Akira Matsuno
Kenji Tsuruhara
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.