Challenge: When does this patent expire?

"I returned a bag of groceries accidentally taken off the shelf before the expiration date."
-TMBG

To those of you who weren't persuaded by earlier posts that determining a patent's expiration date may not always be a simple matter, here's today's challenge:

On what date does U.S. Patent No. 7,647,710, issued today, expire?

Hint #1: You may need to look beyond the basic text page from the patent database.
Hint #2: You may need to look beyond the front page of the patent.
Hint #3: You may need to look at multiple entries in the file wrapper.

Bonus: might your answer change in light of Wyeth?

First correct answer emailed wins a wedding gift found while cleaning my closet over the weekend: a 1998 Borders gift certificate that the store won't honor.

A more complete discussion will follow.