四、专利合作条约(PCT)专利合作条约(Pateut Cooperation Treaty)是继巴黎公约之后缔结的一个重要的国际性专利条约。它是1970年在华盛顿举行的外交会议上通过的。参加会议的有78个国家和22个国际组织的代表。该公约已于1978年1月生效,同年6月开始受理申请。到目前为止已有39个国家加入了专利合作条约。它们是:日本,列支敦士登,卢森堡、马达加斯加、马拉维、马里、毛里塔尼亚、摩纳哥,荷兰、挪威、南朝鲜、罗马尼 Fourth, the Patent Cooperation Treaty (PCT) Patent Cooperation Treaty (Pateut Cooperation Treaty) following the Paris Convention concluded an important international patent treaties. It was adopted at a diplomatic conference held in Washington in 1970. There were 78 countries and 22 international organizations represented at the conference. The Convention entered into force in January 1978, the same year in June began accepting applications. To date, 39 countries have joined the Patent Cooperation Treaty. They are: Japan, Liechtenstein, Luxembourg, Madagascar, Malawi, Mali, Mauritania, Monaco, Netherlands, Norway, South Korea, Romania