Granted Patent
Utility
US 4,585,381 · App. 06/539,621
Void filler
Inventor:
George C. Boyse
Patented Case
View Patent ↗
Granted: Apr 29, 1986
Filed: Oct 6, 1983
Inventor
George C. Boyse
Assignee (at issue)
Down River International, Inc.
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.