Granted Patent
Utility
US 4,517,151 · App. 06/445,972
Method for molding hollow blow-molded articles
Inventors:
Kazuhiro Masumoto, Mituaki Fujimura, Masauki Sawazaki
Patented Case
View Patent ↗
Granted: May 14, 1985
Filed: Dec 1, 1982
Inventors
Kazuhiro Masumoto
Mituaki Fujimura
Masauki Sawazaki
Assignees (at issue)
Mitsui Petrochemical Industries, Ltd.
Yazaki Plastics Industries Co., 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.