Final answer:
The recovery period for purchased patents is typically the remaining legal life of the patent at the time of purchase.
Step-by-step explanation:
The recovery period for patents that have been purchased by a business is typically the remaining legal life of the patent at the time of the purchase. When a business purchases a patent, they essentially acquire the rights to make, use, or sell the invention for the duration of the remaining legal life of the patent. This can vary depending on the specific patent, as patent terms are granted for a maximum of 20 years from the date of filing.