The Federal Circuit has reversed a district court’s narrow construction of key patent claim terms and its finding of indefiniteness.
The ruling revives patent infringement claims against Apple.
As the court explained,
MPH Technologies Oy filed a patent infringement suit against Apple Inc. in the United States District Court for the Northern District of California, accusing Apple of infringing various claims of U.S. Patent Nos. 8,346,949; 9,762,397; 9,712,494; 9,712,502; and 9,838,362 (collectively, the “’949 patent family”); as well as U.S. Patent No. 7,937,581.
The ’949 patent is entitled “Method and System for Sending a Message Through a Secure Connection.”
The patent specification notes the invention is “intended to secure connections in telecommunication networks.”
The technical background identifies a problem with the known methods and systems for securing connections between devices: they were “designed for static connections.”
The patent notes that while “IP security protocols (IPSec) provide[] the capability to secure communications between arbitrary hosts,” “[s]tandard IPSec does not work well” when one of the connected devices is a mobile terminal that “changes its network point of attachment frequently.”
Thus, “the object of the invention is to forward secure messages in a way that enables changes to be made in the secure connection.”
The summary of the invention explains that “[t]he method and system of the invention enable secure forwarding of a message from a first computer to a second computer,” noting that “[p]referably, the first computer processes the formed message using a security protocol.”
It then further specifies that “[p]referably, the secure message is formed by making use of the IPSec protocols, whereby the secure message is formed by using an IPsec connection between the first computer and the intermediate computer.”
It goes on to explain that “[a]n essential idea of the invention is to use the standard protocol (IPSec) between the intermediate computer and the second computer and an ‘enhanced IPSec protocol’ between the first computer and the intermediate computer.”
But it then highlights that “[t]here are, however, several other control protocols that could conceivably be used between the first and the intermediate computer,” and “[t]he invention is not restricted to the details of the figures and accompanying text, or any existing protocols, such as the currently standardized IPSec.”
At claim construction, the district court
- construed the “secure” terms in the asserted claims of the ’949 patent family as limited to the IPSec protocol and
- construed the term “unique identity” of the ’949 patent family as limited to SPI values, which are specific to the IPSec protocol.
The district court also held claims 6, 7, and 8 in the ’581 patent indefinite.
The Federal Circuit noted that
[A] patent claim is indefinite if, when ‘read in light of the specification delineating the patent, and the prosecution history, the claim fails to inform, with reasonable certainty, those skilled in the art about the scope of the invention.’
The court held that a skilled artisan would understand the scope of “establishing a secure connection” with reasonable certainty.
Also, said the court, ‘Reasonable certainty’ does not require ‘absolute or mathematical precision.’
The court disagreed with Apple’s contention that reading the secure connection in limitation 1.e of the patent to be the same as established in limitation 1.a “would just result in a single ‘secure connection’ that has irreconcilably conflicting sets of endpoints.”
However, said the court, when read in light of the specification “the claim informs a skilled artisan that the secure connection remains between the mobile terminal and the security gateway.”
The court accordingly reversed the holding of indefiniteness, vacated the judgment of invalidity of the ’581 patent, and remanded for further proceedings consistent with this opinion.
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