Assignee
YAMANAKA SHIZUO
JP·13 granted patents·58 citations·filing 1981–2012
Technology mixB43K8
Top patents by PatentIndex Score
13 records- 0183US8475071B2Conical nib and writing instrument incorporating the sameYAMANAKA SHIZUO·Filed 2010·Granted Jul 2, 2013·4 cites·5 claims
- 0275USD329660SWriting instrumentYAMANAKA SHIZUO·Filed 1989·Granted Sep 22, 1992·15 cites·1 claims
- 0372US8801314B2Conical NIB and writing instrument using the sameYAMANAKA SHIZUO·Filed 2011·Granted Aug 12, 2014·2 cites·7 claims
- 0454US9233573B2Conical nib and writing instrument using the sameYAMANAKA SHIZUO·Filed 2012·Granted Jan 12, 2016·0 cites·6 claims
- 0551USD690363SPen nibYAMANAKA SHIZUO·Filed 2012·Granted Sep 24, 2013·7 cites·1 claims
- 0648USD692055SPen nibYAMANAKA SHIZUO·Filed 2012·Granted Oct 22, 2013·6 cites·1 claims
- 0738US4386867AMultangular pen nib constructionYAMANAKA SHIZUO·Filed 1981·Granted Jun 7, 1983·6 cites·4 claims
- 0837US4986686AMultiangular penYAMANAKA SHIZUO·Filed 1989·Granted Jan 22, 1991·6 cites·6 claims
- 0935US4986684AMultiangular penYAMANAKA SHIZUO·Filed 1989·Granted Jan 22, 1991·4 cites·8 claims
- 1033US5015113AMultiangular penYAMANAKA SHIZUO·Filed 1988·Granted May 14, 1991·3 cites·1 claims
- 1132USD688306SPen nibYAMANAKA SHIZUO·Filed 2012·Granted Aug 20, 2013·1 cites·1 claims
- 1229USD686282SPen nibYAMANAKA SHIZUO·Filed 2012·Granted Jul 16, 2013·0 cites·1 claims
- 1319US4465391APen nib constructionYAMANAKA SHIZUO·Filed 1982·Granted Aug 14, 1984·4 cites·1 claims
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