Granted Patent
Utility
US 4,511,468 · App. 06/559,273
Rotary vacuum pre-coat filter apparatus
Inventor:
Harold R. White
Patented Case
View Patent ↗
Granted: Apr 16, 1985
Filed: Dec 8, 1983
Inventor
Harold R. White
Assignee (at issue)
Alar Engineering 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.