Prior art — US Patent 8145721

Prior Art Analysis (35 U.S.C. § 102)

As of May 11, 2026, this analysis reviews the prior art cited during the prosecution of U.S. Patent 8,145,721 to assess potential anticipation of the claims under 35 U.S.C. § 102. Anticipation requires that every element and limitation of a claim be found in a single prior art reference. The following three references were cited by the applicant or the examiner during prosecution.

1. WO2003042783A2 ("WO '783")

Full Citation: WO2003042783A2, "File splitting scalade coding and asynchronous transmission in streamed data transfer."
Assignee: Musicmatch, Inc.
Dates: Published May 22, 2003; priority date November 9, 2001. This reference qualifies as prior art.
Brief Description: WO '783 discloses a system for delivering media files using scalable coding. A media file is split into a "base layer" (a playable, lower-quality version) and one or more "enhancement layers" (which contain data to improve the quality). The system allows for "asynchronous transmission," where the base layer can be streamed to a user for immediate playback, while the enhancement layers can be downloaded separately, either concurrently or at a later time. The client device combines the layers to reproduce the full-quality media file.
Potential Anticipation: High. This reference appears to anticipate the independent claims of US 8,145,721.

Anticipates Claim(s)	Analysis
1, 14 (Server Method & Apparatus)	WO '783 teaches every element of the server claims. It describes dividing a multimedia file into a "base layer" (first part) and an "enhancement layer" (second part). Scalable coding inherently means the base layer uses a different, lower-bitrate coding (first coding) than the combination of layers (second coding). The reference explicitly teaches sending the base layer first for immediate streaming ("streaming said first part") and sending the enhancement layer separately ("downloading said second part") via "asynchronous transmission," which maps directly to setting different conditions for the transfer of each part.
7, 10 (User Device Method & Apparatus)	WO '783 likewise teaches the user device claims. The client device in WO '783 is designed to receive the separate streams. It receives the base layer (first bit stream) and can play it immediately (reproducing a limited version... in real-time). It subsequently receives the enhancement layer (second bit stream). The fundamental purpose of the client's scalable decoder is to decode both parts and combine them to create the full, original-quality file (a complete version), which can then be stored.

Anticipates Claim(s)

Analysis

1, 14 (Server Method & Apparatus)

WO '783 teaches every element of the server claims. It describes dividing a multimedia file into a "base layer" (first part) and an "enhancement layer" (second part). Scalable coding inherently means the base layer uses a different, lower-bitrate coding (first coding) than the combination of layers (second coding). The reference explicitly teaches sending the base layer first for immediate streaming ("streaming said first part") and sending the enhancement layer separately ("downloading said second part") via "asynchronous transmission," which maps directly to setting different conditions for the transfer of each part.

7, 10 (User Device Method & Apparatus)

WO '783 likewise teaches the user device claims. The client device in WO '783 is designed to receive the separate streams. It receives the base layer (first bit stream) and can play it immediately (reproducing a limited version... in real-time). It subsequently receives the enhancement layer (second bit stream). The fundamental purpose of the client's scalable decoder is to decode both parts and combine them to create the full, original-quality file (a complete version), which can then be stored.

2. US20060135200A1 ("US '200")

Full Citation: US Patent Application Publication No. 2006/0135200 A1, "Method for transmitting massive data effectively on multi-mode terminal."
Assignee: Min-Hong Yun.
Dates: Published June 22, 2006; priority date December 16, 2004. This reference qualifies as prior art.
Brief Description: US '200 discloses a method for a device with multiple network interfaces (e.g., cellular and Wi-Fi) to download large data files efficiently. It teaches pausing a download on one network and resuming it on another, more optimal network (e.g., faster or cheaper). The goal is to optimize the data transfer based on network availability and user preferences.
Potential Anticipation: Low. This reference does not appear to anticipate any of the independent claims on its own.

Anticipates Claim(s)	Analysis
None	While highly relevant to an obviousness argument for dependent claim 3, US '200 does not appear to teach the core limitations of the independent claims. It does not disclose splitting a single multimedia file into a low-quality streamable part and a high-quality downloadable part based on different encodings. Instead, it teaches a method for managing the download of a pre-existing data file across different networks. It lacks the essential elements of dividing, differential coding, and combining a base layer with an enhancement layer as required by claims 1, 7, 10, and 14.

Anticipates Claim(s)

Analysis

None

While highly relevant to an obviousness argument for dependent claim 3, US '200 does not appear to teach the core limitations of the independent claims. It does not disclose splitting a single multimedia file into a low-quality streamable part and a high-quality downloadable part based on different encodings. Instead, it teaches a method for managing the download of a pre-existing data file across different networks. It lacks the essential elements of dividing, differential coding, and combining a base layer with an enhancement layer as required by claims 1, 7, 10, and 14.

3. US7236988B2 ("US '988")

Full Citation: U.S. Patent 7,236,988 B2, "Methods and systems for providing random access to structured media content."
Assignee: Microsoft Corporation.
Dates: Granted June 26, 2007; priority date December 1, 1999. This reference qualifies as prior art.
Brief Description: US '988 describes a method for organizing media content into "packets" or chunks that are indexed. This structure allows a client to request and download specific portions of a media file without having to download the entire file, enabling features like seeking to a specific point in a video that has not yet been downloaded. The system focuses on providing random access to a uniformly coded file.
Potential Anticipation: None. This reference does not anticipate any claims.

Anticipates Claim(s)	Analysis
None	US '988 does not teach the central inventive concept of US 8,145,721. It does not describe dividing a file into a low-quality "first part" and a high-quality "second part" with different codings. The "packets" in US '988 are simply structural divisions of a single, homogeneously encoded file to enable random access. It does not teach streaming a low-quality version for immediate playback while a separate, high-quality component is downloaded to enhance it. Therefore, it fails to disclose key limitations present in all independent claims.

Anticipates Claim(s)

Analysis

None

US '988 does not teach the central inventive concept of US 8,145,721. It does not describe dividing a file into a low-quality "first part" and a high-quality "second part" with different codings. The "packets" in US '988 are simply structural divisions of a single, homogeneously encoded file to enable random access. It does not teach streaming a low-quality version for immediate playback while a separate, high-quality component is downloaded to enhance it. Therefore, it fails to disclose key limitations present in all independent claims.