文献类型识别代码问题请教 德国专利号后面有个D什么意思?

德国专利号后面有个D
这个D是代表什么文献类型识别代码

是不是指外观设计专利？美国是这样的

不是。

见下例

Abstract not available for DE50204255D
Abstract of corresponding document: WO02069775

The invention relates to a sweeper for cleaning carpets and hard floors, comprising a housing, a dirt collector having a dirt inlet, and a driven rotary brush disposed adjacent to the dirt inlet. The rotary brush is associated with a sweeping sill on the dirt inlet, via which sweeping sill dirt particles are transported to the dirt collector. The aim of the invention is to improve the sweeper in such a manner that its forward movement is not impeded by the sweeping sill. To this end, the sweeping sill is mounted on the housing in such a manner that it can be adjusted in a direction towards the floor area to be cleaned.

如题，请高人指点。

可能是德国专利的补充证书吧！
D1申请的补充保护证书
D2授权的补充保护证书

楼主在欧专局上看看这个专利的同族专利，用代码D1表示的。
Inventor: DIEHL RALPH (DE); JANZEN JACOB (DE); (+1)  Applicant: KAERCHER GMBH & CO KG ALFRED (DE)
EC:  A47L5/34; A47L11/202; (+2) IPC: A47L5/34; A47L11/202; A47L11/24 (+6)
Publication info:  DE50204255D D1 - 2005-10-20

LIVEZHANG 查到的专利正是我们的例子
LIVEZHANG 说的
可能是德国专利的补充证书！有把握吗？能不能给出处看看。

http://www.sipo.gov.cn/sipo/wxfw/ggzlwxxxdt/200607/t20060714_104164.htm
点击文中蓝颜色的《EPO数据库各国专利文献种类代码对照表》
里面的代码很全。
楼主看ST.16一栏。
至于把DE50204255D对应为DE50204255D1，我是猜测的，因为欧专局的同族专利一栏中显示为DE50204255D D1，而有些专利也有这种情况，如
Publication info:  CN1267050C C  - 2006-08-02。
我在以前查到过几个代码标识为D的德国专利，在同族专利中都在D的后面拖了D1。

谢谢livezhang!

\"D kind code for German (DE) patent\"

When an European patent application enters the national phase in Germany, a new patent number for the German part is assigned (designated). The D code is assigned for a granted EP or PCT number in bulletin. At first, the D documents have only the bibliographic data without a real (German ) text. When the translation for this application is filed, this code  will change to T (T1, T2, ...)
有资料表明德国专利流水号（以50开始）50=欧洲专利指定国为德国，德国给予的德国专利号。只在德国专利公报上刊载该号并不出版说明书。说明书是以欧洲专利说明书为准。