4
The short answer is that it is expired for failure to pay a maintenance fee.
The long answer is that Google makes a estimated expiration (their Adjusted expiration) when an application grants to a Patent. This patent grant issued in 2010 (and that's when the Adjusted expiration would have been auto-generated) but then the Applicant did not pay the 7.5 year ...
1
To get to the bottom of almost any issue with a U.S. patent go to Public PAIR. The site is fussy about the format of the application number or publication number you enter. I see the expiration due to fee nonpayment but I do not see any petition to revive so I would guess that the info panel at google patents is garbled.
Transaction History
Date ...
Only top voted, non community-wiki answers of a minimum length are eligible
