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Patents Grantslast 30 patents

Information Patent Grant
Twelve-piece tangram puzzle set
- Patent number 10,078,972
- Issue date Sep 18, 2018
- Dong-sik Cha
- A63 - SPORTS GAMES AMUSEMENTS

Patents Applicationslast 30 patents

Information Patent Application
TWELVE-PIECE TANGRAM PUZZLE SET
- Publication number 20160284237
- Publication date Sep 29, 2016
- Dong-sik CHA
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS