Granted Patent
Utility
US 5,121,131 · App. 07/428,521
Instant high contrast imaging system
Inventors:
Eric W. Bouldin, Brad W. Dreisbach
Patented Case
View Patent ↗
Granted: Jun 9, 1992
Filed: Oct 30, 1989
Inventors
Eric W. Bouldin
Brad W. Dreisbach
Assignee (at issue)
Drexler Technology 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.