Sihai Cao

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Beijing, CN

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Patents Grantslast 30 patents

Information Patent Grant
Metal optical grayscale mask and manufacturing method thereof
- Patent number 8,133,642
- Issue date Mar 13, 2012
- National Center for Nanoscience and Technology
- Chuanfei Guo
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY

Patents Applicationslast 30 patents

Information Patent Application
METAL OPTICAL GRAYSCALE MASK AND MANUFACTURING METHOD THEREOF
- Publication number 20110111331
- Publication date May 12, 2011
- National Center for Nanoscience and Technology
- Chuanfei Guo
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY