Granted Patent
Utility
US 5,982,172 · App. 08/746,794
Method of detecting plastic deformation in steel using a differential type magnetic field sensor
Inventors:
Noboru Ishikawa, Hiroshi Yamakawa, Kazuo Chinone, Satoshi Nakayama, Akikazu Odawara
Patented Case
View Patent ↗
Granted: Nov 9, 1999
Filed: Nov 15, 1996
Inventors
Noboru Ishikawa
Hiroshi Yamakawa
Kazuo Chinone
Satoshi Nakayama
Akikazu Odawara
Assignee (at issue)
SEIKO INSTRUMENTS INC.
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.