U.S. Patent and Trademark Office
Updated February 23, 2017 | Factmonster Staff 
The Question:
A few summers ago I was digging (as I often do) for rocks in my grandmother's backyard. Somehow I came across a small, heavy glass piece. It has a date printed on it and it says "PATENT JANY 11TH 1868." Do you know where I can find patent information online?
The Answer:
Stop by the U.S. Patent and Trademark Office site, which has a searchable database and contact information. Best of luck!
-The Fact Monster
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