Current Practice Areas

Ms. Yoko Ishimaru(Nakatani) practices Preparation and Prosecution of Domestic and International Patent Applications, Invention Mining, and IP Consulting.

Ms. Ishimaru(Nakatani) also handles Design Patent Applications (IP Consulting and Prosecution) and Trademark Patent Applications (IP Consulting, Search and Prosecution).

Technical Fields
Ms. Ishimaru(Nakatani)'s experience covers a wide range of technical fields including Organic Chemistry, Inorganic Chemistry, Machinery and Structures.

In detail, Ms. Ishimaru(Nakatani) is well-versed in the fields of mainly Chemistry and Materials, and also in Polymer Materials, Semiconductor Materials, Optical Materials, Packaging Materials, Inks, Cosmetics, Foods, and others.

Ms. Ishimaru(Nakatani) handles, in addition to cases in the field of Chemistry and Materials, those in the field of Machinery and Structures including medical equipment, masks, bottle caps, to name a few. She assists her clients in the Chemical field in obtaining strong, enforceable patents also from the perspective of Machinery and Structures.

Ms. Ishimaru(Nakatani) has vast experience in patent prosecution and appeals.


● Coauthor. “New Patent Practice Manual of Numerical Limitation Inventions and Parameter Inventions – Best Use of Development Results and Measures against Competitors’ Patents”, Tokyo: JOHOKIKO Co., Ltd., August 2018 (in Japanese)
● Coauthor. “How to Deal with Reasons for Rejection in Chemical and Material Patents”, Tokyo: Science & Technology Co., Ltd., February 2017 (in Japanese)
● Coauthor. “Winnable Patent Practices on Chemical/Material Patent”, Tokyo: Science & Technology Co., Ltd., March 2011 (in Japanese).