HEATED WRITING DEVICE FOR USE WITH THERMOCHROMATIC INK
PROBLEM TO BE SOLVED: To provide a heated writing device for use with thermochromatic ink.SOLUTION: The present disclosure relates to a device for activating thermochromatic ink. The device may include: a drawing tip; a heating element, which may include a positive temperature coefficient (PTC) heat...
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Format: | Patent |
Sprache: | eng ; jpn |
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