US 8520691

Here's a concise summary of US Patent 8520691:

US Patent 8520691: Persistent mesh for isolated mobile and temporal networking

• Title: Persistent mesh for isolated mobile and temporal networking
• Assignee: Dynamic Mesh Networks Inc. (Current Assignee), Mesh Dynamics Inc (Original Assignee)
• Inventors: Francis daCosta, Sriram Dayanandan
• Filing Date: 2010-01-29
• Issue Date: 2013-08-27
• Abstract: A structured wireless mesh network is disclosed where a tree-like connection topology is formed. In one embodiment, each node has separate uplink and downlink radios operating on different channels. When a cluster of such nodes becomes isolated, as in the case of a mobile mesh application, a node in the cluster according to this invention acts as a root node, thus enabling the tree structure to persist, even in isolation. Example methods of joining sub-networks are disclosed that guide the joining of mesh networks and channel management. Nodes that may operate in isolation also support a distributed DHCP capability such that IP addresses are assigned to clients even when a connection to a central DHCP server is unavailable.

Plain-Language Overview of Independent Claims:

The patent US8520691 has two independent claims.

Independent Claim 1 (System Embodiment - Dual Radio):
This claim describes a system comprising at least two structured mesh nodes. Each node has:

• Connectivity logic.
• An uplink radio operating on an uplink frequency.
• A downlink radio operating on a downlink frequency.

The connectivity logic determines how each node connects:

• It uses its uplink radio to connect with an external network or another node.
• Client devices or other mesh nodes connect to it using its downlink radio.

The structured mesh network can operate in two configurations:

1. Connected Configuration: At least one node's uplink radio is connected to an external network.
2. Isolated Configuration: None of the nodes' uplink radios are connected to an external network. In this case, one node acts as an "isolated network root," and all other nodes connect to it as "isolated root children" forming a tree-like structure.

Independent Claim 7 (System Embodiment - Single Relay Radio):
This claim also describes a system comprising at least two structured mesh nodes, but in this embodiment, each node has:

• Connectivity logic.
• A single relay radio.

The connectivity logic determines how each node connects with an external network or another node.

The structured mesh network also functions in two configurations:

1. Connected Configuration: The structured mesh network includes a connection to an external network.
2. Isolated Configuration: None of the structured mesh nodes are connected to an external network. In this scenario, one node acts as an "isolated network root," and all other nodes connect to this isolated root node as "isolated root children and descendant nodes," forming a tree-like configuration.

CAFC 2026 Dockets:
A search of CAFC 2026 dockets did not yield specific litigation directly mentioning US8520691. The provided search results for CAFC dockets listed various cases for May 2026 but none explicitly involving US8520691. It is important to note that a lack of results in this specific search does not definitively mean there is no litigation, as cases can be listed under different identifiers or parties. However, based on the provided search results, no direct mention of US8520691 was found in the CAFC 2026 dockets.