怎么获得日本专利的英文版？

日本专利局只能下日文的，怎么得到英文文本

找其同族专利的英文版本,欧洲局上有英文摘要.

日本专利局有英文网站（在其主页上就有链接），上面有英文版的日本专利申请供检索，不过都是机器翻译的，质量不能保证。

JP4009553
我就是在英文界面上检的，但检了就没反应，哪位高人能帮我见到这篇专利的英文本，谢谢

kind cod=B, number=4009553，检索出来如下专利，不知道是不是你要的：
(57) [Claim(s)]
[Claim 1]
Two or more high frequency switching means which perform passage and cutoff of a high frequency signal between an input terminal and an output terminal according to the control potential impressed as a control signal,
A detection means to detect the high frequency signal which passes said high frequency switching means,
It has the control potential generating circuit to which the control potential impressed to at least one of said two or more of the high frequency switching means is changed so that the difference of said control potential impressed to said high-frequency switching means which is an ON state among said two or more high frequency switching means, and said control potential impressed to said high-frequency switching means which is an OFF state among said two or more high frequency switching means may be expanded according to the amplitude of the high-frequency signal detected with said detection means,
Said control potential generating circuit is a high frequency switching circuit which considers as an input the high frequency signal inputted from said control signal and said input terminal, and is characterized by not needing the other input.

您怎么得到的啊？我只在欧专局上找到摘要的英文，急盼赐教

你进入日本工业产权数字图书馆http://www.ipdl.inpit.go.jp/homepg_e.ipdl，
然后点击号码检索(Patent & Utility Model Gazette DB) （在PAJ上面），进入检索。
在检索时要确定“kind Code”和正确的号码。
这样检索出来结果就是英文版的了。。。。
不过也只有权利要求，还是机器译出来的。。。
下面是他们网站上的声明：
* NOTICES *

JPO and INPIT are not responsible for anydamages caused by the use of this translation.