Granted Patent
Utility
US 4,984,469 · App. 07/437,224
Amplitude measurement device for viscoelasticity analysis
Inventors:
Masafumi Take, Haruo Takeda, Nobutaka Nakamura
Patented Case
View Patent ↗
Granted: Jan 15, 1991
Filed: Nov 16, 1989
Inventors
Masafumi Take
Haruo Takeda
Nobutaka Nakamura
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.