Granted Patent
Utility
US 5,618,581 · App. 08/673,145
Method for making thermochromic writing instruments having a reptilian texture
Inventor:
Jeffrey D. Sheets
Patented Case
View Patent ↗
Granted: Apr 8, 1997
Filed: Jul 1, 1996
Inventor
Jeffrey D. Sheets
Assignee (at issue)
Calladium 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.