| (19) |
 |
|
(11) |
EP 0 050 594 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
26.05.1982 Bulletin 1982/21 |
| (43) |
Date of publication A2: |
|
28.04.1982 Bulletin 1982/17 |
| (22) |
Date of filing: 15.10.1981 |
|
|
| (84) |
Designated Contracting States: |
|
AT CH DE FR LI |
| (30) |
Priority: |
16.10.1980 IT 2537480
|
| (71) |
Applicant: SYNTERGE S.n.c. |
|
() |
|
| (72) |
Inventors: |
|
- Pelizza, Aristide
()
- Pelizza, Gian Pietro
()
|
|
| |
|
| (54) |
Photochromic composition |
(57) A photochromic liquid composition comprises a solution of an azo compound of the
type of carbazone such as dithizone and a metal haloid in a solvent with or without
additional dyes to be applied to transparent plastic surfaces such as spectacles,
shopwindows, etc.