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If you think about it that's one invention that has really stood the test of time without any significant design modifications.
Except for the interior seal liner!
The bottle cap, which was known as the "Bottle Sealing Devise" was patented by William Painter on 2 February 1892 (U.S. Patent 468,258)http://www.google.com/patents?id=mBBrAAAAEBAJ&pg=PA1&source=gbs_selected_pages&cad=2#v=onepage&q&f=falseLet's hear it for the Bottle Cap! Who patented the bottle cap opener and when?