Substituted phenanthropyrans
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 12, 2007
Grant Date -
Oct 5, 2006
app pub date -
Mar 17, 2006
filing date -
Sep 18, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to specific photochromic phenanthropyrans as well as to their use in synthetic resin materials of all types, especially for ophthalmic purposes. In particular, the present invention relates to photochromic compounds derived from 2H-phenanthro[2,1-b]pyrans and 3H-phenanthro[3,4-b]pyrans, which in the open form have especially long wavelength absorption maxima, but in the unexcited state are still colorless.
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