Granted Patent
Utility
US 4,531,784 · App. 06/476,226
Mining machine with dust collector apparatus
Inventor:
Jerry Karlovsky
Patented Case
View Patent ↗
Granted: Jul 30, 1985
Filed: Mar 17, 1983
Inventor
Jerry Karlovsky
Assignee (at issue)
National Mine Service Company
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.