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 Max B Du Pont Vitacolor CorpfiledCriticalMax B Du Pont Vitacolor Corp
Application grantedgrantedCritical
Publication of DK44889CpublicationCriticalpatent/DK44889C/en