What happens to a patent when it expires?

it becomes the property of the state
ownership rights are inherited
the patent is licensed
It becomes public domain
A patent allows you, and only you, to profit from your genius when you invent something new. No one else can manufacture or sell your invention unless you give permission. When a patent expires, anyone can copy your idea and market it. It becomes public domain
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Very interesting!
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Answers by country

it becomes the property of the state
ownership rights are inherited
the patent is licensed
It becomes public domain
answers
flagthe United States
15%
5%
5%
75%
20
flagthe United Kingdom
15%
5%
10%
68%
19
flagPoland
15%
11%
8%
63%
946
flagGermany
33%
8%
0%
58%
12
flagIndia
50%
7%
7%
35%
14