How to check PSU version number

After applying 11.2.0.2.2 PSU patch,I want to check to see the version number as 11.2.0.2.2 but, it was not shown in places:

1st the statement while connecting to database or ASM via sqlplus like:
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production

2nd v$instance

3rd v$version

4th impdp

So what?

In MOS I bumped into a note regarding with the PSU versions after then.
Patch Set Updates for Oracle Products [ID 854428.1] [ID 854428.1]

Patch Set Updates are referenced by their 5-place version number.
The following OPatch commands are a simple way to determine the latest PSU installed in the Oracle Home.

For Database PSUs, enter the following command:
opatch lsinventory -bugs_fixed | grep -i "DATABASE PSU"

For CRS (Cluster Ready Services) PSUs, enter the following command:
opatch lsinventory -bugs_fixed | grep -i "TRACKING BUG" | grep -i PSU

For GI (Grid Infrastructure) PSUs, enter the following command:
opatch lsinventory -bugs_fixed | grep -i "gi psu"

At last I also checked this information from below link, while looking for keyword "5-place version number".
http://forums.oracle.com/forums/thread.jspa?messageID=4250078&tstart=0