adkaustin
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For usual patents (not the design patents of this article) I know the US rules: you must file within a year of public disclosure or any sale. I also know there have been attempts to bring US and foreign rules into better alignment during recent year…
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The "D" means these are design patents. These are more like registered trademarks or copyrights than what is usually implied by "patent". They protect against copying the look and feel of an object, not how they work (an article patent) or how they …