execute opatch in a batch?

Hello,

I want to start opatch in a batch Script.

If I do so, this opatch don't comes back to the batch.

for example  LSINVENTORY.bat:

set ORACLE_HOME=C:\Programme\Ora1120\product\11.2.0\client
set path= %Path%;C:\Programme\ora1120\product\11.2.0\client\perl\bin

echo before opatch

%ORACLE_HOME%\OPatch\opatch lsinventory
echo after opatch

exit

"echo after opatch"  is never reached.

How do you start opatch in a script, that it comes back to the script?

I have tried different ways, but my trials wasn't successful?

Regards

Annette