Progressive-power lens
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 24, 2015
Grant Date -
Sep 13, 2012
app pub date -
Mar 7, 2012
filing date -
Mar 8, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A progressive-power lens has one surface which satisfies the following expressions
where CT(DP) denotes a vertical direction curvature at the distance reference point, CY(DP) denotes a horizontal direction curvature, CY(P) denotes a horizontal direction curvature at a point on the principal meridian which is located further on the near portion than the progressive start point, and CT(P) denotes a vertical direction curvature at the point.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully