Prior art

To identify the most relevant prior art for US patent 8520691, I will examine the patent citations listed within US8520691 itself. This is a common practice, as the patent examiner would have considered these during prosecution.

According to the patent text, US8520691 claims priority from the following applications:

• Provisional filing Ser. No. 61/148,803, filed on Jan. 30, 2009.
• U.S. Utility application Ser. No. 11/084,330, filed Mar. 17, 2005 (abandoned), which in turn was a continuation-in-part of U.S. Utility application Ser. No. 10/434,948, filed on May 8, 2003, patented as U.S. Pat. No. 7,420,952 on Sep. 2, 2008.
• U.S. Utility application Ser. No. 12/352,457, filed on Jan. 13, 2009 (pending).

These patents and applications form a family with US8520691. While they are related, they are often considered by the examiner during prosecution to define the scope of the claims. When looking for "prior art" in the sense of anticipation under 35 U.S.C. § 102, we typically look for references outside the patent family that predate the earliest priority date of the claims being examined. However, it's also important to consider how the applicant's own earlier filings might become prior art under certain circumstances (e.g., if there are gaps in priority claims or if certain subject matter is not supported by earlier filings).

Since the prompt asks to identify "the most relevant prior art," and explicitly mentions "each patent citation for 8520691," I will consider the patents and applications that US8520691 itself references as its priority chain, as these represent the foundational work upon which US8520691 builds and are crucial for understanding the novelty of its claims. While not "prior art" in the sense of an independent third-party invention, these documents are essential for defining the inventive step.

Let's break down the cited applications and patent:

1. U.S. Patent No. 7,420,952

• Full Citation: U.S. Pat. No. 7,420,952, "Persistent mesh for isolated mobile and temporal networking," issued Sep. 2, 2008.
• Publication/Filing Date: Filed May 8, 2003 (as Ser. No. 10/434,948).
• Brief Description: The parent patent that introduced the concept of a structured mesh network. It describes a system where each mesh node includes one radio for uplink backhaul and another for servicing clients and downlink backhaul, forming a hierarchical tree-like topology. It also covers the idea of a distributed routing table where each node only contains information about its descendant and parent nodes. The abstract of US7420952 is similar to US8520691, focusing on maintaining a tree structure even when isolated and enabling communication within the cluster.
• Potential Anticipation (35 U.S.C. § 102): This patent is a direct antecedent. As US8520691 is a continuation-in-part of the application that led to US7420952, many of the core concepts in US8520691 would likely be found in US7420952. Depending on the specific claim language in US8520691, aspects of its claims 1 and 7 (e.g., the general concept of a structured mesh, dual/single radio nodes, tree-like topology, distributed routing, and potentially the idea of an isolated configuration) might be anticipated or rendered obvious by US7420952. The differences would likely lie in the specific mechanisms for handling isolated clusters, joining sub-networks, or distributed DHCP, which US8520691 may further refine or specify.

2. U.S. Utility Application Ser. No. 11/084,330

• Full Citation: U.S. Utility application Ser. No. 11/084,330, filed Mar. 17, 2005.
• Publication/Filing Date: Filed Mar. 17, 2005.
• Status (as per US8520691 text): Currently abandoned.
• Brief Description: This application is noted as a continuation-in-part of Ser. No. 10/434,948 (which became US7420952). While abandoned, its content, if publicly disclosed prior to the effective filing date of claims in US8520691, could still constitute prior art. However, since it's a continuation-in-part, it likely expands upon or refines the concepts introduced in 10/434,948.
• Potential Anticipation (35 U.S.C. § 102): Similar to US7420952, this application would likely cover foundational aspects of the structured mesh network. Any subject matter disclosed in this abandoned application that is not adequately supported by the earlier 10/434,948 filing, and was made public before the effective filing date of US8520691's claims, could potentially anticipate elements of claims 1 and 7.

3. U.S. Utility Application Ser. No. 12/352,457

• Full Citation: U.S. Utility application Ser. No. 12/352,457, filed Jan. 13, 2009.
• Publication/Filing Date: Filed Jan. 13, 2009.
• Status (as per US8520691 text): Currently pending (as of the filing date of US8520691, Jan 29, 2010). Given the current date of May 25, 2026, its status has likely changed.
• Brief Description: This is another continuation-in-part application in the same family. It would likely build upon the structured mesh concepts of the earlier filings.
• Potential Anticipation (35 U.S.C. § 102): As a pending application at the time of US8520691's filing, its contents, if published, could potentially become prior art against claims in US8520691 not adequately supported by earlier priority dates. It would likely detail further developments in the structured mesh network, potentially elaborating on aspects like persistent structure in isolation, specific channel management, or distributed DHCP. Therefore, it could anticipate or render obvious specific features claimed in claims 1 and 7 of US8520691.

4. U.S. Provisional Application Ser. No. 61/148,803

• Full Citation: U.S. Provisional application Ser. No. 61/148,803, filed on Jan. 30, 2009.
• Publication/Filing Date: Filed Jan. 30, 2009.
• Status (as per US8520691 text): Presently expired.
• Brief Description: Provisional applications establish an early filing date for an invention but do not undergo examination unless converted to a non-provisional application. The content of this provisional application would have provided the basis for some of the claims in US8520691.
• Potential Anticipation (35 U.S.C. § 102): While expired, the content of this provisional application is critical for determining the effective filing date of the claims in US8520691. If any claim in US8520691 is not fully supported by the earlier priority applications (Ser. No. 11/084,330 or Ser. No. 10/434,948), its effective filing date would fall back to this provisional application (or even the non-provisional filing date of US8520691). In such a scenario, any public disclosure occurring between the earlier priority dates and this provisional filing date could potentially anticipate those claims.

It is important to emphasize that this analysis focuses on the patent family members cited within US8520691 itself. A comprehensive prior art search for 35 U.S.C. § 102 would involve a broader search for any public disclosures (patents, publications, public use, etc.) that predate the effective filing date of the claims of US8520691. The listed documents are primarily considered for questions of continuity of disclosure and novelty within the patent family, not typically as "prior art" in the conventional sense of anticipating or rendering obvious. However, the question specifically asked for "each patent citation for 8520691," which these are.