US Patent No: 5,186,867
Number of patents in Portfolio can not be more than 2000
Spiro-indoline oxazine compounds with photochromatic and photosensitizing characteristics and the process for their preparation
Stats
-
Feb 16, 1993
Issued date -
Feb 27, 1992
filing date -
07/842,800
serial no -
In Force
status
Importance
Loading Importance Indicators...
Abstract
New compounds of the spiro-indoline-oxazine class possessing photochromatic and photosensitizing charecteristics are definable by the general formula (I): ##STR1## where the substituents R, R.sup.1 -R.sup.7 and A are as defined in the description. The process for preparing the compounds (I) is described, as is their use as photochromic agents able to confer photochromatic characteristics on the articles in which they are incorporated, and as photosensitizing agents.
Loading the Abstract Image...
First Claim
Related Publications
Loading Related Publications...
International Classification(s)
Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
|
|
|||
| 4,785,097 Method for synthesizing spiro-oxazines | 9 | 1986 | |
| 4,792,224 Photochromic compound and articles containing the same | 33 | 1987 | |
| 4,968,454 Variable-light transmittance article and method for preparing same | 86 | 1988 | |
| 4,931,219 Photochromic compound and articles containing the same | 68 | 1989 | |
|
|
|||
| 4,816,584 Photochromic spiro(indoline)benzoxazines | 106 | 1987 | |
| 5,021,196 Method for preparing variable-light transmittance article | 14 | 1990 | |
|
|
|||
| 4,367,170 Stabilized photochromic materials | 88 | 1975 | |
|
|
|||
| 4,962,013 Photochromic material containing a spirooxazine and a nitroxy free radical triplet state quencher | 11 | 1988 | |
|
|
|||
| 4,913,544 Photochromic articles | 103 | 1987 | |
|
|
|||
| 4,784,474 Spiro-oxazine compounds and preparation thereof and photochromic shaped article | 8 | 1987 | |