Granted Patent
Utility
US 4,989,983 · App. 07/461,530
Test sample color comparison device
Inventors:
Takao Terada, Hiroyuki Ota, Shigeru Makita
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Jan 5, 1990
Inventors
Takao Terada
Hiroyuki Ota
Shigeru Makita
Assignee (at issue)
OMRON 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.