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Analysis of Patent Term, Related Applications, and Family for US Patent 8,805,185

Washington, D.C. - April 26, 2026 - A detailed analysis of United States Patent number 8,805,185, titled "Wavelength-division multiplexing transmission device," reveals key information regarding its term, related applications, and international family members. The patent, assigned to Mitsubishi Electric Corp, addresses the stabilization of optical signals in transmission devices.

Patent Term and Expiration

The patent has a standard 20-year term from its earliest effective filing date. The application for US 8,805,185 was filed on June 20, 2011, and it claims priority to a Japanese patent application filed on June 24, 2010. For the purposes of calculating the patent term in the United States, the 20-year period runs from the U.S. filing date.

A review of the patent's file wrapper on the United States Patent and Trademark Office (USPTO) Patent Center indicates that there were no Patent Term Adjustments (PTA) or Patent Term Extensions (PTE) granted. Therefore, the original projected expiration date was June 20, 2031.

However, a critical factor affecting the patent's enforceability is the payment of maintenance fees. According to USPTO records, the maintenance fees for this patent were not paid, leading to its expiration. The patent is now listed as "Expired - Fee Related." This means the patent is no longer in force and its protections have lapsed.

Related Applications

A search for continuity data associated with US application number 13/583,958, which matured into patent 8,805,185, shows no continuation or divisional applications filed in the United States. The application is a standalone filing in the U.S. that claims foreign priority.

International Patent Family

US patent 8,805,185 is part of a larger international patent family, indicating that the invention was protected in multiple jurisdictions. The family members share the same priority application, JP2010143915, filed on June 24, 2010. The known members of this patent family include:

• World Intellectual Property Organization (WIPO): WO2011161929A1
• European Patent Office (EP): EP2587701B1
• Japan (JP): JP5389262B2
• China (CN): CN102959887B

This widespread filing underscores the perceived commercial importance of the technology at the time of its development. However, the current status of these international counterparts would require individual verification in their respective patent offices.