【分析解答题】

A、granted patent is the result of a bargain struck between an inventor and the state, by means of which the inventor gets a limited period of monopoly and publishes full details of his invention to the public after that period terminates. Once the monopoly period comes to an end, all those details of the invention pass into the public domain. Only in the most exceptional circumstances is the life-span of a patent extended to alter this normal process of events.