Invalidity dossier
US 8044835
Linearized optical digital-to-analog modulator
Current assignee: Ramot at Tel Aviv University Ltd
Added 9/24/2026, 12:54:54 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 — US8044835B2
Title: Linearized optical digital-to-analog modulator
Patent number: US8044835B2 (application US12/636,805; pre-grant publication US20100156679A1)
Assignee/Original Assignee: Ramot at Tel Aviv University Ltd.
Inventors: Yossef Ehrlichman, Ofer Amrani, Shlomo Ruschin
Key dates: Priority date 2007-06-13; filing date 2009-12-14; publication date 2011-10-25; legal status listed as Active, with an adjusted expiration of 2028-06-14.
Purpose (plain language, per the excerpt): The patent relates to an optical digital-to-analog modulator — a device that converts a digital input into an analog optical signal. The prior-art keywords supplied ("modulator," "actuating," "electrode," "electrodes," "optical signal") indicate the disclosure concerns controlling an optical signal via one or more actuating electrodes. The title's "linearized" term indicates the modulator is intended to produce a more linear analog optical output.
Scope (as far as the excerpt establishes): The document is classified for optical modulation and light control by interference in waveguide structures (G02F1/225, G02F1/21), optical analog/digital converters (G02F7/00), digital-to-analog converters (H03M1/66, H03M1/70), and optical transmission/intensity modulation (H04B10/50, H04B10/516, H04B10/541, H04B10/548). These classifications indicate the claimed subject matter sits at the intersection of optical modulation and digital-to-analog conversion.
What the excerpt does not establish:
- It does not include the claims, so the exact legal scope of protection cannot be determined from this text.
- It does not include the specification, figures, or detailed description, so the specific modulation architecture, number/arrangement of electrodes, and linearization technique are not established here.
- It does not identify specific prior-art references or the examiner's cited art.
- It does not establish the accuracy of the listed legal status, expiration date, or assignee (the source itself notes these are assumptions and not legal conclusions).
Source: https://patents.google.com/patent/[US8044835](/patent/US8044835)/en
Generated 10/1/2026, 9:31:40 PM
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Litigation summary
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Proceedings on file (0)
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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
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Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.