Friction body, writing instrument and writing instrument set
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United States of America Patent
Stats
-
Mar 14, 2017
Grant Date -
Nov 27, 2008
app pub date -
May 21, 2008
filing date -
May 22, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
There is provided a friction body which is adapted to rub a thermochromic image or handwriting formed on a paper surface by use of thermochromic ink to thermally discolor the thermochromic image or handwriting by frictional heat resultant from rubbing, a thermal conductivity of a friction portion of the friction body is set to be within 0.05 W/(m·K) to 50 W/(m·K).
First Claim
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International Classification(s)
- 2008 Application Filing Year
- B43K Class
- 124 Applications Filed
- 80 Patents Issued To-Date
- 64.52 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 5 Citation Count
- B43K Class
- 23.50 % this patent is cited more than
- 8 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Sep 14, 2028 |
