Granted Patent
Utility
US 4,335,081 · App. 06/232,570
Crystal growth furnace with trap doors
Inventors:
Emanual M. Sachs, Brian H. Mackintosh
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Feb 9, 1981
Inventors
Emanual M. Sachs
Brian H. Mackintosh
Assignee (at issue)
Mobil Tyco Solar Energy Corporation
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.