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. 点击查看答案

Man’ s chief offence against nature has been to damage the earth’ s natural covering of vegetation without replacing it with a system of farming that is to maintain the fertility of the soil. Man, the farmer, has penetrated new lands in many directions, and the forests and grasslands have been vulnerable to his various activities. 点击查看答案