both - components being biconcave

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Patents Grantslast 30 patents

Information Patent Grant
Camera lens assembly comprising four lenses of +−++, ++−+ or +−−+ r...
- Patent number 11,280,981
- Issue date Mar 22, 2022
- ZHEJIANG SUNNY OPTICAL CO., LTD.
- Xinquan Wang
- G02 - OPTICS
Information Patent Grant
Lenses for the 1.50 to 2.55 micron band
- Patent number 6,246,517
- Issue date Jun 12, 2001
- The United States of America as represented by the Secretary of the Army
- John M. Hall
- G02 - OPTICS
Information Patent Grant
Copy lens
- Patent number 5,506,729
- Issue date Apr 9, 1996
- Fuji Photo Optical Co., Ltd.
- Hiromitsu Yamakawa
- G02 - OPTICS
Information Patent Grant
Plastic objective lens system adapted for correction for temperature
- Patent number 4,632,520
- Issue date Dec 30, 1986
- Fuji Photo Optical Co., Ltd.
- Hiromitsu Yamakawa
- G02 - OPTICS
Information Patent Grant
3695750
- Patent number 3,695,750
- Issue date Oct 3, 1972
- G02 - OPTICS