Prior art

The requested comprehensive list of specific patent citations for US patent 9031581, along with their detailed descriptions and anticipation analysis under 35 U.S.C. § 102, is not fully available from the provided authoritative patent text or the conducted search results. The full patent text does not include a "References Cited" section. While a search snippet from Google Patents for US9031581 briefly lists some "U.S. PATENT DOCUMENTS" under "References Cited", this list appears to be incomplete for a modern patent.

Based on the available search results, the following US patent documents are mentioned as "References Cited":

• Full Citation: US 1,103,073 A to O'Connell

• Publication/Filing Date: July 7, 1914 (Issue Date)

• Brief Description: Without access to the full text of US 1,103,073 A, a detailed description cannot be provided. However, given its publication date of 1914, it is highly improbable that this patent describes any elements related to cellular wireless devices, GPS, server-based location services, or digital map displays as claimed in US9031581. It likely pertains to a very broad or unrelated field of technology.

• Potential Anticipation (35 U.S.C. § 102): Due to the extreme age of this patent and the technological advancements inherent in US9031581, it is highly unlikely to anticipate any of the independent claims (1, 26, 42) of US9031581 under 35 U.S.C. § 102. Anticipation requires every element of a claim to be present in a single prior art reference. This 1914 patent would not disclose a cellular wireless device, GPS receiver, internet-connected server, or software for mutual location tracking and mapping.

• Full Citation: US 3,953,720 A to Kelch

• Publication/Filing Date: April 4, 1976 (Issue Date)

• Brief Description: Without access to the full text of US 3,953,720 A, a detailed description cannot be provided. Given its 1976 publication date, it predates widespread cellular telephony, GPS, and internet-based services. It may relate to rudimentary tracking or communication systems, but not those involving the specific digital and network technologies central to US9031581.

• Potential Anticipation (35 U.S.C. § 102): Similar to the 1914 patent, it is highly unlikely that US 3,953,720 A would anticipate any of the independent claims (1, 26, 42) of US9031581 under 35 U.S.C. § 102. This patent would not include the combination of elements such as a cellular wireless device with a GPS receiver, software for exchanging encrypted location data with a server, or displaying locations on a map, which are fundamental to US9031581.

General Prior Art Discussed within US9031581 (for Contextual Relevance):

While not specific patent citations, the US9031581 patent itself discusses several categories of prior art that are conceptually relevant, particularly for an obviousness analysis under 35 U.S.C. § 103, rather than direct anticipation under § 102:

• One-way location sharing systems: The patent explicitly mentions services like On Star and Mercedes Benz TeleAid, where cars with GPS and cellular capabilities could be tracked by an aid center. [cite: The one way location sharing prior art includes On Star and the Mercedes Benz TeleAid services where, via GPS receivers and cellular phone capability built into a car, an aid center can track cars all over the world and speak with the occupants and sense when the cars airbags have deployed.] It also refers to commercial "kid tracking systems" that provided one-way location sharing. [cite: Other commercial services allow parents to track the locations of their children in a one way location sharing manner.] These systems demonstrate the prior existence of devices obtaining location, transmitting it via cellular networks, and having a central system for tracking.
• Typical prior art cellular system infrastructure (FIG. 12): The patent references existing cellular network components like transceiver towers, central switching systems, and connections to the public service telephone network for digital radio communications. [cite: FIG. 12 is a block diagram of a typical prior art cellular system infrastructure in which the method and apparatus of the invention work in a peer-to-peer embodiment.]
• E911 requirements: These mandates already required cellular devices to transmit location information during emergency calls. [cite: Use and sale of an application that makes use of the on-board GPS capability of cell phones and PDAs built to comply with the E911 requirement allows the carriers to recoup some of the costs imposed upon them by the E911 requirement.]
• Web-enabled, Java-enabled cell phones/PDAs with GPS and displays: The patent mentions these as existing technologies suitable for its preferred embodiment, implying their availability prior to the invention's priority date. [cite: the invention contemplates 2.5 GHz and 3 GHz Java enabled, web enabled (or similar) cell phones and Personal Digital Assistants or other web enabled wireless products with global positioning system (GPS) receivers and sufficiently large liquid crystal displays for the preferred embodiment.]

While these general categories of prior art highlight existing components and concepts, they do not constitute single references that would anticipate the specific combination of features claimed in US9031581, such as mutual real-time location sharing, dynamic "Instant Buddy" creation, or server-mediated distribution of encrypted location data with mapping functionality, under a strict § 102 analysis. They are, however, highly relevant for an obviousness analysis, as discussed in the "Obviousness" section of this report.