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Current content: 159 212 084 patent documents

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125 820 new documents added

1 120 546 documents amended

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EP 0050594 A2 19820428 - Photochromic composition.

Title (en)

Photochromic composition.

Title (de)

Photochrome Zusammensetzung.

Title (fr)

Composition photochromique.

Publication

EP 0050594 A2 19820428 (EN)

Application

EP 81830195 A 19811015

Priority

IT 2537480 A 19801016

Abstract (en)

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.

IPC 1-7

G03C 1/72

IPC 8 full level

G03C 1/73 (2006.01)

CPC (source: EP)

G03C 1/73 (2013.01)

Designated contracting state (EPC)

AT CH DE FR LI

DOCDB simple family (publication)

EP 0050594 A2 19820428; EP 0050594 A3 19820526; IT 1194818 B 19880928; IT 8025374 A0 19801016

DOCDB simple family (application)

EP 81830195 A 19811015; IT 2537480 A 19801016