[ILUG-BOM] search entire block-pattern after a given pattern, then delete that block-pattern

hi I am trying to edit a file through a shell script, but i am trying to edt it in a particular manner

here is a typical scenario i am facing

I have a file called script.txt withe following content :

*the owner of the* *trademark UNIX* *is The Open Group* *an industry standards* *consortium*.

Now i want to edit this file , but i want to edit this file in such a manner that after a given pattern i should be able to search an entire block-pattern , then delete that block-pattern .

for example suppose

after this given pattern */trademark UNIX/ * if exist then i want to delete the block-pattern /*is The Open Group*\n*an industry standards/*

??? any ideas

to append is pretty much simple with "sed " sed -i "/*trademark UNIX*/a*UNIX is great* \n*UNIX is awesome*" script.txt my file would then look something like this

*the owner of the* *trademark UNIX* *UNIX is great* *UNIX is awesome* *is The Open Group* *an industry standards* *consortium*

its is possible with sed and awk. can some one help me with my above query

Thanks