Klausner Technologies files patent lawsuits under its visual voicemail patents against Comcast, Cablevision and eBay Inc.’s Skype with damages and future royalties estimated at $300 million.

The lawsuit asserts that the above companies’ VOIP voicemail products and services infringe Klausner Technologies’ U.S. Patent 5,572,576. The patent has already been licensed to various other companies which provide the same visual voice messaging services, including Time Warner’s AOL for its AOL Voicemail services, Vonage Holdings for its Vonage Voicemail Plus services as well as others, under the Klausner Patents.

Cablevision’s Optimum Voicemail, Comcast’s Digital Voice Voicemail and eBay’s Skype Voicemail each violate Klausner’s intellectual property rights by allowing users to selectively retrieve and listen to voice messages via message inbox displays.

The suit has been filed by the California law firm of Dovel & Luner in a federal court in the Eastern District of Texas. “We have litigated this patent successfully on two prior occasions, said Greg Dovel of Dovel & Luner, counsel for Klausner Technologies. "With the signing of each new licensee, we continue to receive further confirmation of the strength of our visual voicemail patents.”