Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ppg Industries IncfiledCriticalPpg Industries Inc
Priority to IN1087DE1987priorityCriticalpatent/IN175132B/en
Priority to IN922DE1990prioritypatent/IN175149B/en
Priority to IN923DE1990prioritypatent/IN175150B/en
Publication of IN175132BpublicationCriticalpatent/IN175132B/en