Google & Ecobee v. EcoFactor (22-1750) — Federal Circuit Vacates PTAB Ruling
Google and Ecobee jointly appealed a PTAB patentability ruling defending EcoFactor’s smart thermostat patent US8498753B2. The Federal Circuit found the Board’s claim construction erroneous and vacated the Final Written Decision, sending the case back for fresh analysis after 644 days.
Federal Circuit rejects PTAB’s claim construction in smart thermostat IPR
Filed on 4 May 2022, Case No. 22-1750 is an appeal before the United States Court of Appeals for the Federal Circuit brought by Google LLC and Ecobee Inc against EcoFactor Inc. The dispute centres on US8498753B2, a patent covering a system, method, and apparatus for just-in-time conditioning using a thermostat — technology directly relevant to connected home HVAC management. The appeal followed a Patent Trial and Appeal Board (PTAB) Final Written Decision in an inter partes review proceeding in which the Board had ruled on patentability.
The Federal Circuit closed the case on 7 February 2024 by vacating the Board’s Final Written Decision and remanding for further proceedings. The court’s sole basis for doing so was its finding that the Board had misconstrued the ‘[1m]’ limitation in Claim 1 of US8498753B2. A vacatur-and-remand does not resolve patentability on the merits; it directs PTAB to re-examine the question under the correct claim construction, meaning the patent’s validity remains formally undecided.
The 644-day duration reflects standard Federal Circuit appellate cadence for IPR appeals, which typically resolve in 18–24 months. The relatively focused outcome — a single claim-construction error driving the entire reversal — suggests the parties’ briefing converged on this interpretive issue as the pivotal dispute. What remains unknown from the public record is whether PTAB will ultimately cancel, confirm, or partially uphold the challenged claims on remand, and whether Google or Ecobee will pursue further invalidity arguments under the corrected construction.
Filing to settlement in 644 days
644-day appeal — consistent with typical Federal Circuit IPR remand timelines
What ‘Vacated and Remanded’ means for EcoFactor’s thermostat patent
Vacatur is not invalidity — the patent survives for now
A vacated PTAB decision wipes the Board’s ruling from the record without substituting the Federal Circuit’s own patentability judgment. EcoFactor’s US8498753B2 is neither confirmed valid nor cancelled by this outcome. The patent remains enforceable while the case returns to PTAB, which must now reconsider whether the challenged claims survive under the construction the Federal Circuit has mandated.
Patent validity still openA single disputed limitation drove the entire reversal
The Federal Circuit identified an erroneous construction of the ‘[1m]’ limitation in Claim 1 as the operative error. Claim construction disputes are questions of law reviewed de novo by the Federal Circuit, making them the most common route to reversal. The breadth of the remand — vacating the entire Final Written Decision — suggests the [1m] construction was load-bearing for every patentability determination the Board made.
De novo claim constructionGoogle and Ecobee must re-argue invalidity at PTAB
Petitioners Google and Ecobee do not automatically win on remand. PTAB will apply the corrected [1m] construction and may reach the same or a different conclusion on obviousness or anticipation. Both companies must re-engage in PTAB proceedings, maintaining their legal spend and uncertainty over the patent’s validity — a meaningful drag for product teams shipping smart thermostat integrations that may read on EcoFactor’s claims.
Remand re-examination pendingEcoFactor retains enforcement leverage during remand
Because the patent is not cancelled, EcoFactor can continue to assert US8498753B2 in parallel district court proceedings during the PTAB remand period. An IPR typically stays parallel litigation, but strategic timing of remand proceedings and any district court actions will be critical. EcoFactor’s leverage is greatest before PTAB issues a new Final Written Decision under the corrected construction.
Continued assertion possibleFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Google, LLC | Company | Google LLC & Ecobee Inc — petitioners challenging validity of US8498753B2Search in Eureka ↗ |
| Defendant | EcoFactor, Inc | Company | EcoFactor, Inc — smart home HVAC software company and patent owner of US8498753B2Search in Eureka ↗ |
| Plaintiff counsel | Elizabeth Laughton | Attorney | Counsel for Google, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Matthew A. Smith | Attorney | Counsel for Google, LLCSearch in Eureka ↗ |
| Defendant counsel | Jonathan Link | Attorney | Counsel for EcoFactor, IncSearch in Eureka ↗ |
| Defendant counsel | Reza Mirzaie | Attorney | Counsel for EcoFactor, IncSearch in Eureka ↗ |
| Presiding judge | Judge / | Chief Judge | Court of Appeals for the Federal Circuit — Chief JudgeSearch in Eureka ↗ |
Stipulation of dismissal — official text
The Federal Circuit’s order — ‘VACATED AND REMANDED’ — is procedurally significant but substantively neutral on patentability. By reversing only the Board’s claim construction of the [1m] limitation and vacating the Final Written Decision, the court leaves US8498753B2’s validity entirely unresolved. For EcoFactor, the patent remains in force. For Google and Ecobee, the invalidity campaign continues at PTAB under a corrected legal framework, with outcome uncertain.
US8498753B2 — Just-in-Time HVAC Conditioning via Smart Thermostat
US8498753B2, filed under application number US12/773690, claims a system, method, and apparatus for just-in-time conditioning using a thermostat. The patent covers predictive HVAC control logic that anticipates occupancy or comfort targets and pre-conditions a space to reach the desired temperature precisely when needed, rather than on a simple schedule. This positions the invention at the intersection of machine learning-assisted climate control and connected home infrastructure — a technically dense area with broad commercial applicability across residential and light commercial HVAC platforms.
The patent’s strategic value lies in its potential to read on the predictive and adaptive algorithms embedded in modern smart thermostats, including products from Google Nest and Ecobee — both named petitioners in this IPR. EcoFactor has pursued an active licensing and enforcement programme around this and related patents, making US8498753B2 a credible threat to any platform that offers schedule-learning or occupancy-anticipating temperature control. The Federal Circuit remand extends the patent’s commercial relevance by delaying a final patentability determination.
Should your product team run an FTO against US8498753B2?
Any company developing or commercialising smart thermostat software, HVAC control algorithms, or building automation platforms that incorporate predictive or just-in-time conditioning logic should treat US8498753B2 as a priority FTO target. The fact that Google and Ecobee — two of the most sophisticated players in connected home technology — jointly petitioned for IPR review signals that the claims are considered broad enough to create real product risk. The remand means no PTAB cancellation has occurred, so the patent is fully live.
PatSnap Eureka’s FTO Search Agent can map your product’s conditioning logic against the claim language of US8498753B2 — including the disputed [1m] limitation — and surface related EcoFactor patents that may extend coverage. Setting up a claim monitoring alert will notify your team when PTAB issues its new Final Written Decision on remand, enabling you to update your FTO analysis in real time rather than discovering a changed risk landscape during product launch.
Run a freedom-to-operate analysis on US8498753B2 to assess your product’s exposure
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What this case signals for the connected home HVAC IP landscape
A Federal Circuit remand on claim construction keeps EcoFactor’s thermostat patent live — and keeps pressure on Google, Ecobee, and any HVAC platform integrating predictive conditioning.
Claim construction is the highest-leverage attack point in HVAC software patents
This case confirms that a single disputed functional limitation can unwind an entire IPR outcome. Companies asserting or defending smart thermostat IP should invest heavily in claim mapping before PTAB institution — the cost of a poorly anchored construction is a full re-run of the proceeding.
Joint petitioner strategies can signal commercial threat levels
Google and Ecobee filing jointly suggests both perceived the EcoFactor patent as a credible commercial threat to their respective platforms. When major platform players align against a single patent owner, it typically indicates the patent reads broadly enough to affect multiple product lines — a flag for others in the connected home space.
Google v EcoFactor — key questions answered
The Federal Circuit vacated the PTAB’s Final Written Decision and remanded for further proceedings. The court found that the Board had erroneously construed the ‘[1m]’ limitation in Claim 1 of US8498753B2. The patent’s validity was not decided on the merits — PTAB must re-examine patentability under the correct claim construction.
US8498753B2 is an EcoFactor patent covering a system, method, and apparatus for just-in-time conditioning using a thermostat. It protects predictive HVAC control technology that pre-conditions a space to reach a target temperature at a specified time, underpinning smart thermostat features such as schedule learning and occupancy anticipation.
The public record does not state the commercial rationale explicitly, but a joint IPR petition typically suggests both parties perceived the patent as a credible threat to their products. Google Nest and Ecobee both market smart thermostats with predictive conditioning features that may read on the claims of US8498753B2, creating shared commercial incentive to seek invalidity.
It means the PTAB’s prior ruling is nullified and the case returns to the Board for a fresh decision under the correct claim construction. EcoFactor’s patent US8498753B2 is not cancelled — it remains in force and enforceable. A new Final Written Decision from PTAB will eventually resolve whether the challenged claims are patentable.
The ‘[1m]’ designation refers to a specific functional or structural limitation in Claim 1 of US8498753B2 — the precise language is part of the patent claim. The Federal Circuit found PTAB’s interpretation of this limitation to be legally incorrect. Because claim construction is a question of law reviewed de novo, an error on a single key limitation can — and here did — invalidate the Board’s entire patentability analysis.
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