Granted Patent
Utility
US 4,541,366 · App. 06/603,314
Feed water preheater
Inventors:
Helmut Lang, Son LeMong
Patented Case
View Patent ↗
Granted: Sep 17, 1985
Filed: Apr 24, 1984
Inventors
Helmut Lang
Son LeMong
Assignee (at issue)
BBC Brown, Boveri & Company Ltd.
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.