This paper analyses the revenue curve of patent duration and the model of maintaining patent, and then for the first time, explains the difference of patent costs between at home and abroad.
文章通过分析专利的期限收益曲线、专利维持模型,首次提出国内企业和国外企业的专利成本的不同,并对此现象进行了解释。
The water drive characteristic curve is one of basic methods on predicting development targets of water - drive oil field, applied widely at home and abroad.
水驱特征曲线是预测水驱油田开发指标的基本方法之一,在国内外都有较为广泛的应用。
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