One thing that I do not understand is: REVO has spent a lot of money and time to apply for the patents, finally they become a worthless. Is it true?
My answer: The REVO patents are worthless, until someone has a need to use them.
The Intellectual Property protected by patent is very limited. In their SEC filings the company states:
The EyeTalk® technology is primarily a software platform with a hardware component of an external smart camera deployed at a chosen location.
This is an accurate summary. The company has a patent on its proprietary software platform. It doesn't have a patent on the smart camera.
The patent covers communication with a smart camera if that communication is done using the company's proprietary software platform. The patent does not cover communication with a camera using other platforms, such as the Internet Protocol.
In its SEC filing the company states that:
The system offers two-way communication and it streams video to designated PC or handheld devices such as PDA’s, smart phones or other smart devices.
This is an accurate statement. The company does not have a patent for two-way communication or streaming to smart devices. It has a patent for a software platform which offers that facility.
As no companies are using REVO's software platform no companies are infringing the patent.
So ADT don't infringe the REVO patent, by offering two-way communication, because they're not using a camera or the REVO software platform.