Granted Patent
Utility
US 6,017,594 · App. 08/974,397
Writing instruments with thermochromic liquid crystal coatings
Inventor:
Jeffrey D. Sheets
Patented Case
View Patent ↗
Granted: Jan 25, 2000
Filed: Nov 19, 1997
Inventor
Jeffrey D. Sheets
Assignee (at issue)
J.R. Moon Pencil Co., 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.