Granted Patent
Utility
US 5,225,507 · App. 07/628,357
Polymer and polypropylene resin composition
Inventors:
Tadashi Asanuma, Kaoru Kawanishi, Hiroshi Matsuzawa, Yukari Nishimori
Patented Case
View Patent ↗
Granted: Jul 6, 1993
Filed: Dec 17, 1990
Inventors
Tadashi Asanuma
Kaoru Kawanishi
Hiroshi Matsuzawa
Yukari Nishimori
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.