Inventor · disambiguated record
Takayuki Ikai
Also filed as: IKAI TAKAYUKI
10 granted patents·3 pending applications·82 citations·filing 1998–2023
86Inventor score
Files withMITSUBISHI PENCIL CO13
Top patents by PatentIndex Score
13 records- 0186US10569596B2Writing tool refill and writing tool using sameMITSUBISHI PENCIL CO·Filed 2016·Granted Feb 25, 2020·5 cites·8 claims
- 0280US5942027AInk for ball point penMITSUBISHI PENCIL CO·Filed 1998·Granted Aug 24, 1999·51 cites·3 claims
- 0365US6830611B2Oil-base ink composition, writing utensils and dyes to be used thereinMITSUBISHI PENCIL CO·Filed 2001·Granted Dec 14, 2004·9 cites·56 claims
- 0460US2024150599A1Oily ink compositionMITSUBISHI PENCIL CO·Filed 2022·Application pending·0 cites
- 0556US6945726B2Refill for oil-based ink ballpoint pen and oil-based ink ballpoint penMITSUBISHI PENCIL CO·Filed 2004·Granted Sep 20, 2005·6 cites·6 claims
- 0655US7381754B2Oil-based ink composition and uses thereofMITSUBISHI PENCIL CO·Filed 2002·Granted Jun 3, 2008·4 cites·22 claims
- 0755US2025179317A1Oil-based ink composition for writing utensilsMITSUBISHI PENCIL CO·Filed 2023·Application pending·0 cites
- 0854US12054622B2Oil-based ink composition for writing utensils, writing utensil using same, and airbrush unit using sameMITSUBISHI PENCIL CO·Filed 2019·Granted Aug 6, 2024·0 cites·4 claims
- 0954US11654711B2Writing tool provided with refillMITSUBISHI PENCIL CO·Filed 2019·Granted May 23, 2023·0 cites·1 claims
- 1054US11135868B2Refill for writing implements and writing implements using the sameMITSUBISHI PENCIL CO·Filed 2018·Granted Oct 5, 2021·0 cites·15 claims
- 1150US2010297901A1Coloring composition for preventing see-through of cloth, coloring method using the coloring composition and cloth whose back is coloredMITSUBISHI PENCIL CO·Filed 2007·Application pending·0 cites
- 1245US7311459B2Follower for non-aqueous ball point pen and non-aqueous ball point penMITSUBISHI PENCIL CO·Filed 2004·Granted Dec 25, 2007·1 cites·17 claims
- 1335US6441061B1Additive for oil-based ink for a ball point pen and oil based ink for a ball point pen containing the sameMITSUBISHI PENCIL CO·Filed 1999·Granted Aug 27, 2002·6 cites·9 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →