方法介绍美国药物专利方面的法规政策及FDA专利情报的检索，并对在FDA及专利数据库检索过程中遇到的问题进行分析。
METHODS Introduce American drug patent system and the method of FDA information retrieval, analyze and ravel out the problems from FDA information retrieval.
美国化学文摘数据库提供与化学相关的文献与专利。
Chemical Abstracts Service Database provides the chemistry-related literature and patents.
通过对美国专利商标局（USPTO）专利数据库检索过程的实例说明，介绍该专利网络检索方法，供用户在检索美国专利文献时参考与使用。
The methods for USPTO patent database searching were introduced by examples, so as to be used to search patents in United States.
通过对美国专利商标局（USPTO）专利数据库检索过程的实例说明，介绍该专利网络检索方法，供用户在检索美国专利文献时参考与使用。
The methods for USPTO patent database searching were introduced by examples, so as to be used to search patents in United States.
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