Granted Patent
Utility
US 5,723,178 · App. 08/519,918
Method for making thermochromic writing instruments using topically applied thermochromic pigments
Inventor:
Jeffrey D. Sheets
Patented Case
View Patent ↗
Granted: Mar 3, 1998
Filed: Aug 28, 1995
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.