Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Process for manufacturing pencil by tri-extrusion and the produced pencil having an intermediate protective casing

Process for manufacturing pencil by tri-extrusion and the produced pencil having an intermediate protective casing

US Patent 5244297 · Granted Sep 14, 1993

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Storage and display device for storing and displaying a plurality of longitudina2020
Writing instrument containing a granular material in the ink chamber2013
Correcting fluid with drying indicator2012
Combination writing instrument2012
Writing implement comprising a device for venting the reservoir2012
Writing implement with pivoting roller2011
Writing article having a capillary reservoir with improved ink delivery2008
Writing instrument including a valve feeder device2008
Eraser for a white board2007
Combination writing instrument2006
Colored liquid composition for editing pen2006
Liquid ink writing instrument with a shape memory valve2006