Granted Patent
Utility
US 5,554,831 · App. 08/312,063
Sound absorbing member
Inventors:
Hiroshi Matsukawa, Kyoichi Watanabe, Hiroshi Sugawara
Patented Case
View Patent ↗
Granted: Sep 10, 1996
Filed: Sep 26, 1994
Inventors
Hiroshi Matsukawa
Kyoichi Watanabe
Hiroshi Sugawara
Assignees (at issue)
Mitsubishi Kasei Corporation
Nissan Motor 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.