IP Library › Granted Patent US 6,786,797
Granted Patent Utility
US 6,786,797 · App. 10/715,480

Double layer blocks capable of turning endlessly

Inventor: I-Fen Cheng
Patented Case View Patent ↗
Granted: Sep 7, 2004 Filed: Nov 19, 2003
Inventor
I-Fen Cheng

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Quick Facts
Patent No.
US 6,786,797
App. No.
10/715,480
Filed
2003-11-19
Granted
2004-09-07
Kind
B1