This is huge! Looks like whatever issues that caused it to be rejected the first time have been resolved and all IGEN has to do is pay some fees/file paperwork and patent will be granted!
The notice of allowance is an official written notification from the USPTO that your trademark survived the opposition period after publication in the Official Gazette and has been allowed. However, it doesn't mean the trademark is registered yet. The notice of allowance is simply another step toward registration.