User:Kameraad Pjotr/patents

• Category:DR PD-US-patent-no notice
• http://www.google.com/patents
• http://www.copyright.gov/records/
  • [[Commons:Deletion requests/Template:PD-US-patent-no notice]]: [[Template:PD-US-1978-89|published after 1989]], protected by copyright, even without a notice.
  • [[Commons:Deletion requests/Template:PD-US-patent-no notice]]: [[Template:PD-US-1978-89|copyright registered within 5 years of publication]], protected by copyright, even without a notice.
  • {{PD-US-no notice}}: 1923 - 1977 (inclusive)
  • {{PD-US-1978-89}}: 1978 - March 1, 1989 (non-inclusive)