Reuters reported that US District Judge Henry Morgan in Norfolk, Virginia, came to the decision after a non-jury trial that lasted for a month.
The judge found that a fifth patent was not infringed.
Justice Morgan said in his 167-page decision said the case was clear-cut, adding that Cisco's evidence had inconsistencies, and its own technical docuemnts which Centripetal produced at the trial proved the applicant's case.
Justice Morgan said in his judgment that “Cisco did not advance any objectively reasonable defences at trial" about the four patents.
“The infringing functionality was added to their accused products post 20 June 2017, and resulted in a dramatic increase in sales which Cisco touted in both technical and marketing documents,” he added.
Cisco said it would appeal the decison to the US Federal Circuit Court of Appeals.