Colored lead pencil
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 2, 2000
Grant Date -
N/A
app pub date -
Dec 18, 1998
filing date -
Dec 18, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention relates to a colored pencil lead having an essentially water-free base material that is at least partially water-soluble or can be suspended in water, which base material contains at least one dye and at least one reactant present in a solid form, wherein this reactant, when in a watery solution, causes a change in color in the dye.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully