Invalidity dossier
US 5596570
System and method for simulating interference received by subscriber units in a spread spectrum communication network
Current assignee: Qualcomm Inc
Added 9/23/2026, 8:28:24 PM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US5596570A
Title: "System and method for simulating interference received by subscriber units in a spread spectrum communication network"
Assignee: Qualcomm Inc (original assignee; current assignee listed as Qualcomm Inc)
Key dates (as listed; priority/status dates are assumptions per the source):
- Priority date: 1994-07-13
- Filing date: 1996-05-22 (application US08/651,310)
- Publication/grant: 1997-01-21
- Anticipated expiration: 2014-07-13; status listed as "Expired - Lifetime"
Inventor: Samir S. Soliman
Purpose: The patent addresses simulating signal interference in a communication system such as a wireless subscriber telephone and/or data system. The excerpt explains that estimating interference is of particular concern in CDMA systems, since subscriber units transmit power over the same bandwidth irrespective of location. It notes that determining forward-link interference through field tests would require many subscriber units and base stations, precluding complete system calibration when fewer base stations were available during initial system testing than would eventually be installed.
Plain-language scope (per the excerpt): The disclosed method/apparatus simulates interference received by subscriber units in a spread spectrum (preferably CDMA) network in which subscribers in multiple cells communicate via at least one base station. The base station has at least one transmitter sending information over at least one communication channel in a first cell. The method includes determining a first composite signal energy associated with transmission from the base station transmitter over a first set of simulated communication channels, determining a first average data rate for transmission of that composite signal energy (which can be based on a rate established for users in the system), and adjusting signal power transmitted over the communication channel in accordance with a first [text truncated at this point].
What the excerpt does not establish: The full claim language, the remaining method steps, the complete detailed description, the drawings' content, prosecution history, any legal conclusion on validity or enforceability, and any litigation or ownership-transfer information. The excerpt is explicitly partial ("Excerpt only; consult the source for omitted text"), so no complete scope can be stated.
Source: https://patents.google.com/patent/[US5596570](/patent/US5596570)/en
Generated 10/1/2026, 9:41:24 PM
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Litigation summary
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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
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Obviousness
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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.