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  3. When an invention is made, the inventor has three possible courses of action open to him; he can give the invention to the world

When an invention is made, the inventor has three possible courses of action open to him; he can give the invention to the world

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问题     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 patent it. (46) Secrecy obviously evaporates once the invention is sold or used, and there is always the risk that in the meantime another inventor, working quite independently, will make and patent the same discovery. (47) A granted patent is the result of a bargain struck between an inventor and the state, by means of which 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. (48) The longest extension ever granted was to Georges Valensi; his 1939 patent for color TV receiver circuitry was extended until 1971 because for most of the patent’s normal life there was no color TV to receive and thus no hope of reward for the invention. But even short extensions are normally extremely rare.
    Because a patent remains permanently public after it has terminated, the shelves of the library attached to the patent office contain details of literally millions of ideas that are free for anyone to use and, if older than half a century, sometimes even re-patent. Indeed, patent experts often advise anyone wishing to avoid the high cost of conducing 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. (49) Likewise, because publication of an idea in any other form permanently invalidates further patents on the idea, it is traditionally safe to take ideas from other areas of print. Much modern technological advance is based on these presumptions of legal security.
    (50)Anyone closely involved in patents and inventions soon learns that most "new" ideas are, in fact, as old as the availability of new technology. The basic patent for the theory of magnetic recording dates back to 1886. Many of the original ideas behind television originate from the late 19th and early 20th century. Even the Volkswagen rear engine car was anticipated by a 1904 patent for a cart with the horse at the rear.
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答案迄今为止，乔治·沃莱恩西专利延长期是最长的。他在1939年获得的彩色电视接收机线路的专利，延长到了1971年，因为在这项专利的正常期内，世界上根本就没有彩电信号可收，因而也就没有希望得到这一发明的报酬。
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