The Law Office of Daniel F. Perez

As of May 2, 2026

The Law Office of Daniel F. Perez is a solo or small intellectual property firm whose patent litigation practice is centered on asserting patent rights on behalf of non-practicing entities (NPEs). Public records indicate the firm's principal, Daniel F. Perez, controls the Texas-based patent enforcement entity Orthosie Systems, LLC. The firm does not appear to maintain a public website or have a significant office footprint, and it is not ranked by major legal publications.

The firm’s patent litigation is highly specialized, focusing on the vehicle telematics and GPS tracking industry. The practice concentrates on enforcing a specific patent portfolio related to vehicle monitoring systems. This is consistent with the firm's single tracked appearance as lead counsel for the plaintiff, Orthosie Systems, LLC. The firm operates exclusively on the plaintiff side, representing a patent assertion entity in its enforcement campaigns.

The firm's most notable litigation involves a series of lawsuits filed by Orthosie Systems, LLC against numerous companies in the fleet management and vehicle tracking sector. In the tracked case, Orthosie Systems, LLC v. Track Your Truck, Inc., filed in the Eastern District of Texas, the firm asserted U.S. Patent No. 7,430,471, which covers methods for monitoring a vehicle. Reports show Orthosie has asserted this same patent against many other defendants in multi-year campaigns. In at least one prior case, Orthosie dropped its lawsuit against a defendant without receiving payment after that defendant highlighted its successful track record in prior NPE litigation.

There is no publicly available information to suggest the firm or Daniel F. Perez has a practice before the Patent Trial and Appeal Board (PTAB). The firm's known activity is limited to district court litigation. Daniel F. Perez is the principal and sole attorney of record in the firm's tracked litigation.