专利交易是指将专利以有偿的方式在不同的经济主体间的转移。其中，买方取得专利使用权或所有权，卖方获得超额经济利润。专利交易是以货币为媒介的产权，包含产权的产品和服务的价值交换。
拥有互补性专利的双寡头厂商可以进行三种方式的专利交易，分别是无专利授权、交叉许可授权和专利联盟授权。
Two duopoly firms with the perfect complementary patents may conduct three types of patent transaction, they are no patent licensing, cross licensing, patent pools licensing respectively.
但是为什么一个拥有合法专利的公司会进行这样的交易？
But why would a firm with a legal patent strike such a deal?
即使很快达成出售专利的协议，任何交易都可能需要数月时间才能完成。
Even if an agreement is reached to sell the patents soon, it could take months for any deal to close.
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