Granted Patent
Utility
US 3,984,281 · App. 05/539,839
Plate type liquid heater and evaporator
Inventor:
Bernhard Buchwald
Patented Case
View Patent ↗
Granted: Oct 5, 1976
Filed: Jan 9, 1975
Inventor
Bernhard Buchwald
Assignees (at issue)
Henry Balfour & Company Ltd.
Eduard Ahlborn Aktiengesellschaft
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.