Granted Patent
Utility
US 4,904,943 · App. 07/241,261
Method for detecting long waves and predicting earthquakes
Inventor:
Kozo Takahashi
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: Sep 7, 1988
Inventor
Kozo Takahashi
Assignee (at issue)
Communications Research Laboratory, Ministry of Posts and Telecommunications
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.