RESEARCH METHODOLOGY

Detailed explanation-1: -In most countries a granted patent can be maintained in force for 20 years from the date of filing of the patent application. It is usually necessary to pay renewal fees (usually annually) to keep a patent in force.

Detailed explanation-2: -Giving patents an expiration date will allow competition to keep the price competitive and allow improvements to the idea. There are some companies that wish to hold onto the intellectual property that they use to produce products.

Detailed explanation-3: -A U.S. utility patent, explained above, is generally granted for 20 years from the date the patent application is filed; however, periodic fees are required to maintain the enforceability of the patent.