Invalidity dossier
US 8412823
Managing tracking information entries in resource cache components
Current assignee: Amazon Technologies Inc
Added 9/20/2026, 5:18:53 AM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 8,412,823 B1
Title: Managing tracking information entries in resource cache components
Patent number: US 8,412,823 B1 (application US 12/412,443)
Assignee/Current assignee: Amazon Technologies Inc. (original assignee same)
Inventors: David R. Richardson; Bradley E. Marshall; Swaminathan Sivasubramanian
Filing date: 2009-03-27 | Priority date: 2009-03-27 | Publication/grant date: 2013-04-02
Legal status (as listed): Expired – Fee Related; adjusted expiration 2031-11-21 (status noted as an assumption, not a legal conclusion)
Classifications: H04L67/5682 (cache updating/deleting/replacing policies); H04L47/83 (admission control based on usage prediction)
Purpose (from supplied text): Content providers use network storage providers and CDN service providers that maintain resource cache components distributing content. When resources are updated or invalidated, providers must manage each cache server component still holding a prior version. The described approach addresses inefficiency in using "time to refresh" parameters: short refresh times burden the system with frequent update requests, while long refresh times risk continued distribution of invalid, expired, or incorrect resources before updates are retrieved from the origin source.
Plain-language scope: The patent concerns tracking-information entries in resource cache components — i.e., records used to manage cached resources, including invalidation of previously provided resources with updated versions and refresh-timing parameters. Figures 1–5B depict a content delivery environment with client computing devices, a content provider, a network storage provider, and a CDN service provider, showing registration, resource-request processing, and CDN-side resource management.
Source: https://patents.google.com/patent/US8412823/en (excerpt fetched 2026-09-20)
What the excerpt does not establish: The supplied text is a truncated Google Patents page — claim language, detailed description, dependent/independent claim counts, and the full specification are omitted. The excerpt provides only definitions, figure captions, classifications, and bibliographic data. It does not establish claim scope, validity, enforceability, or the prior-art references relied upon.
Generated 10/1/2026, 10:02:50 PM
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Litigation summary
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PTAB challenges
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Assignment history
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Prior art
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Obviousness
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Extensions
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Derivative works
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