Tesla Partially Succeeds at CAFC with Ruling Finding Some EV Charging Claims Obvious

The U.S. Court of Appeals for the Federal Circuit (CAFC) issued a decision today in Tesla, Inc. v. Charge Fusion Technologies, LLC, affirming in part, reversing in part, and vacating in part a final written decision of the United States Patent and Trademark Office’s Patent Trial and Appeal Board (PTAB). The CAFC determined that the PTAB improperly construed a limitation of one independent claim but correctly construed limitations of other independent claims. The court reversed the finding of non-obviousness for claim 1, vacated the judgment regarding its dependent claims, and affirmed the finding of non-obviousness for the remaining claims.

U.S. Patent No. 10,819,135 relates to an electric charging system for intelligently charging battery-powered vehicles that Charge Fusion Technologies, LLC owns. The ‘135 patent describes an embodiment in which a user may safely leave a pet in a parked vehicle by establishing charging parameters that keep the air conditioning on to maintain a cool vehicle or keep the heat on to maintain a warm vehicle.

Tesla petitioned for inter partes review (IPR) of several claims of the ‘135 patent. Tesla argued that the claims would have been obvious in light of a Japanese patent application known as Hibi. The PTAB issued a final written decision finding that Tesla failed to prove that the challenged claims were invalid as obvious, and Tesla appealed.

Writing for the CAFC, Judge Reyna addressed the construction of the climate control limitation in claim 1. The PTAB determined that the claim requires the instructions to take the battery level into account in some manner when operating the climate control mechanism. Tesla argued that the plain language does not require that the climate control mechanism itself actually take the battery charge level into account. The Federal Circuit agreed with Tesla, finding that “the claims merely require that the climate control mechanism continue until the battery charge reaches a predetermined level.” The court noted that the specification does not indicate that the instructions take into consideration the battery level in some manner when operating the climate control mechanism. Consequently, the Federal Circuit vacated that portion of the PTAB’s construction.

On patentability of claim 1, the Federal Circuit held that under the correct claim construction, the claim is unpatentable. The PTAB found that Hibi taught operating its climate control system in an automatic mode for a duration of time, which can extend beyond the low battery abnormality condition. The Federal Circuit concluded that these findings, supported by substantial evidence, demonstrate that Hibi teaches the climate control limitation under the proper construction. Since claim 1 would have been obvious, the court reversed the PTAB’s decision on patentability for that claim. The court also vacated the determination as to dependent claims 2-5, 7, and 15 and remanded for further proceedings.

Tesla also argued that the PTAB improperly construed the climate control limitations of claims 8 and 14. Tesla contended that the PTAB improperly applied its construction of claim 1 to those claims and erroneously imposed an additional construction requiring an actual determination of the time available for climate control operations. The Federal Circuit affirmed the PTAB’s construction and explained that claims 8 and 14 each recite “a threshold amount of time,” a term not included in claim 1. Both claims reflect a requirement to determine the time available for climate control based on the battery level. The specification supports this construction because “the system cannot accurately notify the user of the 15-minute threshold without determining when the car will deplete the battery at the current A/C setting.”

The Federal Circuit then considered whether substantial evidence supported the PTAB’s finding of non-obviousness for claims 8 and 14. Tesla relied on Hibi’s disclosure of a low-battery abnormality detected with a voltmeter, contending that “Hibi’s low battery level necessarily corresponds to the amount of time the system can maintain the desired temperature;” however, the Federal Circuit disagreed. The court found that Hibi “is silent as to any relationship between operating its climate control system and remaining battery charge level.” It also noted that Tesla’s reading would make much of the climate control limitations in claims 8 and 14 meaningless. The court concluded that “Hibi provides no teaching regarding the duration of operation of the climate control system relative to a remaining charge level of the battery,” and affirmed the finding of non-obviousness for claims 8-11, 14, and 16.

Tesla further argued that the PTAB’s construction of the disputed limitations violated the Administrative Procedure Act (APA). Tesla contended that the PTAB’s construction of claim 1 was presented for the first time in the final written decision. Since the Federal Circuit vacated the challenged portion of the construction, it did not reach the question of an APA violation for claim 1. Regarding claims 8 and 14, Tesla argued that the PTAB violated the APA by importing its erroneous construction and adopting further constructions without prior notice. The Federal Circuit disagreed, finding that the PTAB did not violate the APA. The court noted that the PTAB had requested input on the meaning of the limitations in its institution decision and questioned Tesla regarding the specific requirements during oral argument. The court concluded that Tesla “was afforded sufficient notice and opportunity to address the construction of the Climate Control Limitations of claims 8 and 14.”