Takayuki Sawai

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Display device with a transparent optical filter
- Patent number RE43924
- Issue date Jan 15, 2013
- Dowa Holdings Co., Ltd.
- Takayuki Sawai
- 349 - Liquid crystal cells, elements and systems
Information Patent Grant
Display device with a transparent optical filter
- Patent number RE41833
- Issue date Oct 19, 2010
- Dowa Holdings Co., Ltd.
- Takayuki Sawai
- 349 - Liquid crystal cells, elements and systems
Information Patent Grant
Display device with a transparent optical filter
- Patent number 6,020,945
- Issue date Feb 1, 2000
- Dowa Mining Co., Ltd.
- Takayuki Sawai
- G02 - OPTICS