Legally you can, however there is nothing protecting you from having your product idea stolen so its probably not a good idea
To determine if the patent for the product has expired, you should check the United States Patent and Trademark Office (USPTO) database or consult a patent attorney.
you can sell it.
The fee related to an expired patent is the cost to renew or reinstate the patent after its expiration date has passed.
20 years
Entrepreneur
latent means a hidden something : patent means a document that says that you have the right to make or sell a new product.
Patents protect inventors from having their work copied by others. The work to be protected must be original, useful, and not obvious. An example of this is the popular drug Zocor. It was under patent until June, 2006, so no other company could make and sell that drug. The patent expired and now other companies can sell the drug labeled with its generic name, Simvastatin. Once issued, a patent can be used to prevent others from making, using, selling or importing any product or service that infringes any valid claim in the issued patent, but only in countries where the patent is issued and valid.
Patents protect inventors from having their work copied by others. The work to be protected must be original, useful, and not obvious. An example of this is the popular drug Zocor. It was under patent until June, 2006, so no other company could make and sell that drug. The patent expired and now other companies can sell the drug labeled with its generic name, Simvastatin. Once issued, a patent can be used to prevent others from making, using, selling or importing any product or service that infringes any valid claim in the issued patent, but only in countries where the patent is issued and valid.
Supposedly it expired decades ago...
The patent-adjusted expiration for this product occurs when the patent protection expires.
Lipitor which expired in 2011 was the most valuable patent ever with sales exceeding $105 over the life of the patent.
Absolutely! You can sell your product at any time, whether you have a patent or not. However, you need to make absolutely certain that your product is not in violation of someone else's patent, or your could be sued . That would not be wise. A pending patent means approval is most likely coming but sometimes the search comes back saying there is a similar product on the market and the patent is denied after all. It's best to wait until you get the absolute go ahead before you start making any plans for sale.