Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Color-memorizing photochromic writing instrument, color-memorizing photochromic writing instrument set using the same and method for alternately expressing color-memorizing photochromic function of writing image

Color-memorizing photochromic writing instrument, color-memorizing photochromic writing instrument set using the same and method for alternately expressing color-memorizing photochromic function of writing image

US Patent 7575386 · Granted Aug 18, 2009

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Light emitting device2025
Vehicle light-adjusting window and vehicle light-adjusting window system2022
Light control film and vehicle body panel including the same2020
Photochromic toy2018
Photochromic toy2018
Water-soluble photochromic compound2017
Friction body, writing instrument and writing instrument set2017
Thermochromic color-memorization toner, cartridge including same housed therein,2015
Light-activated actuator element2014
Method for alternately expressing color-memorizing photochromic function in toy 2013
Method for alternately expressing color-memorizing photochromic function in toy 2013
Method for alternately expressing color-memorizing photochromic function in toy 2013