Based on the information available, I was unable to find a specific expiration date for Lipitor rebates. However, it is important to note that the expiration date for rebates can vary and is often determined by the manufacturer or the specific rebate program.

Lipitor, also known as atorvastatin, is a medication used to treat high cholesterol and prevent heart disease. The drug is manufactured by Pfizer and has been available in generic form since 2011.

According to DrugPatentWatch.com, the patent for Lipitor expired in November 2011, which led to the introduction of generic versions of the drug [1]. However, the expiration date for any rebates offered on Lipitor or its generic equivalents would be determined by the manufacturer or the rebate program, not the patent status.

It is recommended to check the manufacturer's website or contact the rebate program directly for the most accurate and up-to-date information on expiration dates for Lipitor rebates.

Sources:
[1] DrugPatentWatch.com, "Lipitor (Atorvastatin) Drug Patent Expiration Dates", <https://www.drugpatentwatch.com/drugs/lipitor.html>.