Choose a U.S. patent that has not yet expired. Generally, that means the patent number should be somewhere between 8 million and 11 million. Please select a "utility" patent rather than a "design" patent. Discussing criteria that could influence that patents value. Note that the assignment is not asking for a valuation of "the invention" but rather "the patent" as a legal instrument. https://portal.uspto.gov/pair/PublicPair