General Patent Corporation Licenses DTL Patent to Plantronics and Sennheiser

Suffern, NY, May 5, 2009 − General Patent Corporation (GPC), the leading patent licensing and patent enforcement firm, announced today on behalf of its client, Digital Technology Licensing LLC (DTL), that it has licensed DTL's patent to Plantronics, Inc. (NYSE: PLT) and Sennheiser Communications A/S of Denmark.

DTL owns U.S. Patent No. 5,051,799 titled “Digital Output Transducer,” which is an essential patent for digital studio microphones. The patented technology also covers Adaptive Multi-Rate (AMR) codec and other cellular communication standards and is used to assure backward compatibility of cell phone handsets and base stations. Other applications of this patented technology include Bluetooth headsets.

“We are very pleased to extend a license under the DTL patent to Plantronics and Sennheiser for their Bluetooth headsets and microphones,” said Paul Lerner, General Patent’s Sr. Vice President and General Counsel.

General Patent Corporation represents DTL in the licensing and enforcement of the ‘799 Patent. DTL brought patent infringement lawsuits against Verizon Wireless, Cingular Wireless (now known as AT&T Mobility), T-Mobile, Sprint and other companies. GPC previously announced that Nokia, Ericsson, Sony-Ericsson, Samsung, LG and others had licensed DTL’s Patent, and that all lawsuits except for Verizon, Sprint and Kyocera had been settled.

About Digital Technologies Licensing LLC

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Digital Technology Licensing LLC of Suffern, N.Y., is the owner of U.S. Patent No. 5,051,799 titled “Digital Output Transducer.” DTL is a portfolio company of IP Holdings LLC and is managed by General Patent Corporation. A non-exclusive license under the patent is available on reasonable and non-discriminatory terms. For licensing terms, please contact Paul Lerner at (845) 368-4000 x104. For more information, please visit

About General Patent Corporation

General Patent Corporation, headquartered in Suffern, New York, represents clients in patent enforcement and assertive licensing matters on a contingency basis. GPC also provides IP valuation, IP strategy and patent brokerage services. General Patent is the premier patent enforcement firm in the U.S., and is the managing member of DTL. For more information, visit

About IP Holdings LLC

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IP Holdings LLC, an affiliate of General Patent Corporation, is an IP-centric merchant banking organization. IP-Holdings provides IP-related financial services as well as IP brokerage services. IP Holdings also operates an idea incubator. IP Holdings is a member of DTL. For more information on IP Holdings, visit