Progressive power lens

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5719657
SERIAL NO

08816888

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A progressive power lens whose distance viewing vertex power is a negative value and in which a surface refractive power Pf.sub.m in the main meridional plane in a distance viewing portion is larger than a surface refractive power Pf.sub.s in a plane perpendicular to the main meridional plane (Pf.sub.m >Pf.sub.s). A surface refractive power Pn.sub.m in a section in the main meridional plane in a near viewing portion is smaller than the surface refractive power Pn.sub.s in a plane perpendicular to the main meridional plane (Pn.sub.m

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Patent Owner(s)

Patent OwnerAddress
SEIKO OPTICAL PRODUCTS KABUSHIKI KAISHA (TRADING AS SEIKO OPTICAL PRODUCTS CO LTD )ITOHPIA NIHONBASHI SA BLDG 2-10 NIHONBASHI HORIDOME-CHO 1-CHOME CHUO-KU TOKYO 103-0012

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Izawa, Yasunori Tokyo, JP 10 86
Shirayanagi, Moriyasu Tokyo, JP 35 429

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