Legal status (The legal status 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 status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duckham Arthur Mac Dougall
Woodall Duckham 1920 Ltd
Original Assignee
Duckham Arthur Mac Dougall
Woodall Duckham 1920 Ltd
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 Duckham Arthur Mac Dougall, Woodall Duckham 1920 LtdfiledCriticalDuckham Arthur Mac Dougall
Priority to ES141484ApriorityCriticalpatent/ES141484A1/en
Publication of ES141484A1publicationCriticalpatent/ES141484A1/en
ES141484A1936-03-031936-03-03
Improvements in the construction of vertical retorts for the distillation of coal and other carbonaceous materials.
ExpiredES141484A1
(en)