Do trademarks expire?

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Tags

1. #copyrights
2. #after
3. #states
4. #expire
5. #period
6. #uspto
7. #registered
8. #patents
9. #trademark
10. #grants
11. #office
12. #using
13. #commerce
14. #united
15. #owner
16. #patent
17. #unlike
18. #enough
19. #ordinary
20. #trademarks
21. #however
22. #continue