Prior art

I am unable to provide a comprehensive list and analysis of the most relevant prior art for US Patent 8,721,511 at this time. My current tools do not allow me to directly access and parse the "References Cited" or "Prior Art Documents" section from patent databases like Google Patents or USPTO PatFT for a specific patent number.

To accurately fulfill this request, I would need to:

1. Obtain the complete list of patents and non-patent literature cited by US8721511 as prior art.
2. For each item on that list, retrieve its full citation details, publication/filing dates, and a description (e.g., from its abstract and key figures/claims).
3. Then, perform a detailed comparison of each cited prior art reference against the independent claims (Claims 1, 11, 20, and 28) of US8721511 to identify potential anticipations under 35 U.S.C. § 102.

Without the specific list of cited prior art, I cannot proceed with the requested analysis.