Granted Patent
Utility
US 4,487,248 · App. 06/401,221
Scroll manufacturing method and tool
Inventors:
Eiji Fukushima, Seiichi Fukuhara, Masaharu Hiraga
Patented Case
View Patent ↗
Granted: Dec 11, 1984
Filed: Jul 23, 1982
Inventors
Eiji Fukushima
Seiichi Fukuhara
Masaharu Hiraga
Assignee (at issue)
SANDEN CORPORATION
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.