Granted Patent
Utility
US 4,968,140 · App. 07/300,928
Manual device for the determination or measurement of photometric data using a measuring head
Inventors:
Markus Berner, Fortunat Schrammli, Lido Feri, Wilhelm Koch
Patented Case
View Patent ↗
Granted: Nov 6, 1990
Filed: Jan 24, 1989
Inventors
Markus Berner
Fortunat Schrammli
Lido Feri
Wilhelm Koch
Assignee (at issue)
Gretag Aktiengesellschaft
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.