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
Priority claimed from US07/148,249external-prioritypatent/US4835929A/en
Application filed by Gaf Building MaterialsfiledCriticalGaf Building Materials
Application grantedgrantedCritical
Publication of ATE90759T1publicationCriticalpatent/ATE90759T1/de