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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 whole

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

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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 whole world by publishing it, keep the idea secret, or patent it
    A granted patent is the result of a bargain struck between an inventor and the state, by which the inventor gets a limited period of monopoly and publishes full details of his invention to the public after that period terminates.
    Only in the most exceptional circumstances is the life-span of a patent extended to alter this normal process of events.
    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 colour TV to receive and thus no hope of reward for the invention
    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 any other inventor’s right is to plagiarize a dead patent likewise, because publication of an idea in any other form permanently invalidates further patents on that 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.
    Anyone closely involved in patents and inventions soon learns that most "new" ideas are, in fact, as old as the hills. It is their reduction to commercial practice, either through necessity or dedication, or through the availability of new technology, that makes news and money. 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.  
Which of the following is TRUE according to the passage?
选项 A、It is necessary for an inventor to apply for a patent before he makes Ms invention public.
B、A patent holder must publicize the details of his invention when its legal period is over.
C、One can get all the details of a patented invention from a library attached to the patent
D、When a patent becomes out of effect, it can be re-patented or extended if necessary.
答案B
解析 可从文中第二段的后半部分推知，即在专利期限截止以后，发明者就要把他发明的全部细节公诸于众。从文中第一段的内容可推知，发明者可以把发明公诸于众，保守秘密或是为其申请专利，因此A项不正确。根据文中的第五段第一句话可知，人们可以从隶属于专利局的图书馆里查到一项专利的全部细节是在其专利期限结束以后，而不是对正在享受专利保护的发明可以查到全部细节，因此C项不正确。
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