Invalidity dossier
US 9485743
Method and apparatus for utilizing a second receiver to establish time and frequency
Current assignee: Airhop Communications Inc
Added 9/23/2026, 1:35:31 PM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview: US 9,485,743 B2
Title: Method and apparatus for utilizing a second receiver to establish time and frequency
Patent number: US9485743B2 | Application number: US14/519,036 | Publication: US20150105065A1
Assignee: Airhop Communications Inc. (original and current assignee as listed)
Key dates: Priority date 2008-09-17; filing date 2014-10-20; granted/publication date 2016-11-01; anticipated expiration 2029-07-10. Legal status listed as "Expired - Fee Related."
Purpose: The invention addresses synchronizing one network element's timing (e.g., slave) with another network or network element (e.g., master). The source explains that timing and frequency information is needed on both sides of communications devices; such network elements can be physically separated, powered on/off independently, and do not share oscillators. Synchronizing time/phase and frequency within a designated margin of error therefore requires communication between the elements. The text notes synchronization supports tasks such as simultaneous measurements in test equipment, and in cellular systems frequency alignment between user equipment (UE) and basestations, hand-off between basestations, and neighbor-cell measurement. Basestations obtain frequency references from the network, a GPS receiver, or an expensive high-accuracy oscillator. Network-based techniques (e.g., IEEE-1588, T1, E1) are described as simple and inexpensive but typically suited to relatively localized systems.
Plain-language scope: According to the title and abstract-level description, the patent concerns using a second receiver to establish time and frequency—i.e., a synchronization approach for aligning timing and frequency between network elements. The excerpt also references classifications H04W56/00 (synchronisation arrangements) and H04J3/06 (synchronising arrangements/time synchronisation).
What the excerpt does not establish: It is an excerpt only. It does not provide the full claims, detailed embodiments, figures, or the complete description; it does not identify specific prior art references; and it does not establish litigation, ownership transfers, validity, or enforceability. The assignee, dates, and legal status are as listed and are explicitly assumptions, not legal conclusions.
Generated 10/1/2026, 9:53:01 PM
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Litigation summary
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Proceedings on file (0)
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No PTAB proceedings on file. This patent has not been challenged via IPR, PGR, or CBM. The absence is itself a signal — well-asserted patents eventually attract IPRs. The LLM analysis below may surface filings the ODP feed hasn’t indexed yet.
PTAB challenges
AIA trial proceedings at the USPTO Patent Trial and Appeal Board — IPR, PGR, and CBM. Petitioners, judge panels, claim-level invalidation outcomes from Final Written Decisions, and Federal Circuit appeals. The single most important defensive datapoint after litigation history.
Assignment history
Inventors, original assignee, and the chain of ownership recorded with the USPTO — including the correspondent attorney who recorded each assignment, since shell-LLC chains often share one repeat-player attorney even when the entity names look unrelated. Surfaces NPE / patent-troll patterns: shell-entity transfers, known asserters in the chain, repeat correspondent fingerprints, pre-litigation assignments, and bankruptcy fire-sales.
Prior art
Earlier patents, publications, and products that may anticipate or render the claims unpatentable.
Obviousness
Combinations of prior art that suggest the claimed invention would have been obvious under 35 U.S.C. § 103.
Extensions
Patent term adjustments, term extensions, continuations, divisionals, family members, and expiration dates.
Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.