Granted Patent
Utility
US 4,881,878 · App. 06/902,419
Gas compressor of variable volume
Inventors:
Takeshi Kobayashi, Junichi Asai
Patented Case
View Patent ↗
Granted: Nov 21, 1989
Filed: Aug 29, 1986
Inventors
Takeshi Kobayashi
Junichi Asai
Assignee (at issue)
Seiko Seiki Kabushiki Kaisha
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.