Granted Patent
Utility
US 4,379,551 · App. 06/183,049
Playground tube slide
Inventor:
Paul W. Ahrens
Patented Case
View Patent ↗
Granted: Apr 12, 1983
Filed: Sep 2, 1980
Inventor
Paul W. Ahrens
Assignee (at issue)
Miracle Recreation Equipment 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.