US Patent 7452148 Lead holding structure of mechanical pencil
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Patent Inventor Names
Hitoshi Suzuki0
Kyo Nakayama0
Takeo Fukumoto0
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Patent abstract
A lead holding structure of a mechanical pencil where a predetermined lead holding force is maintained so that a lead does not move even if a writing pressure is repeatedly applied to the lead and where a so-called biting-off of a lead (break) is prevented without damaging the lead in repeatedly sending forward and backward operations.
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US Patent 07452148 Lead holding structure of mechanical pencil US Patent 7452148 Lead holding structure of mechanical pencil
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Patent Number
07452148
Patent Number
7452148
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US Patent 07452148 Lead holding structure of mechanical pencil
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Is a
Patent jurisdiction
Patent number
07452148
Date of patent
November 18, 2008
Patent application number
10597774
Date Filed
March 10, 2005
Patent primary examiner
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