Inventor · disambiguated record
Changhai Dai
Also filed as: DAI CHANGHAI
3 granted patents·1 pending application·3 citations·filing 2013–2017
50Inventor score
Top patents by PatentIndex Score
4 records- 0155US9669651B2Fully-automatic pencil sharpenerGUANGZHOU PANYU TUNG YUNG STATIONERY MFY LTD·Filed 2013·Granted Jun 6, 2017·3 cites·9 claims
- 0236US2014284369A1Staple-ejecting type staplerGUANGZHOU PANYU TUNG YUNG STATIONERY MFY LTD·Filed 2013·Application pending·0 cites
- 0329US10556363B2Electric staplerNINGBO WEISHU STATIONERY CO LTD·Filed 2017·Granted Feb 11, 2020·0 cites·8 claims
- 0427US10703129B2Electric pencil sharpenerNINGBO WEISHU STATIONERY CO LTD·Filed 2017·Granted Jul 7, 2020·0 cites·8 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →