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How do you get a patent or patents?
First step, you should do the patentability search for your invention. You can take help from Patent Agent/Patent Attorney for conducting patentability search.
After that, the invention description...
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How can you renew an expired patent?
If the patent has expired it means that the invention that was covered under that patent is now "In the Public Domain," and anyone can use, make it, produce it, etc. It cannot be patented again.
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Can you sell your product if patent has expired?
Legally you can, however there is nothing protecting you from having your product idea stolen so its probably not a good idea
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How can you patent something that has already been patent but the patent has run out?
Short answer, you can't. Not in the US, anyway. Trying to "re-patent" an item that once had a patent would likely end in a denied application. For one, the invention would no longer meet the Novelty...
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What is patent and how much does a patent cost?
The term patent usually refers to a right granted to anyone who invents or discovers any new and useful process, machine, article of manufacture, or composition of matter, or any new and useful...