[填空题]When an invention is made, the inventor has three possible courses of action open to him: he can give the invention to the world by publishing it, keep the idea secret, or (36) it.
A granted patent is the result of a (37) struck between an inventor and the state, by which the inventor gets a limited period of (38) and publishes full details of his invention to the public after that period (39) .
Only in the most (40) circumstances is the life span of a patent extended to alter this normal process of events.
A patent remains (41) public after it has terminated. Indeed, patent experts of- ten advise anyone wishing to avoid the high cost of (42) a search through live patents that the one sure way of avoiding violation of any other inventor’s right is to steal and use a dead patent. Likewise, because publication of an idea in any other form permanently (43) further patents on that idea, it is tradi