Signals Defense, LLC Email Format

Defense and Space ManufacturingMaryland, United States11-50 Employees

Signals Defense, LLC is a defense and space manufacturing company based in Owings Mills, Maryland, founded in 1999. Its core offering centers on optically clear window film technology designed to attenuate RF and IR signals, supporting shielding for facilities handling classified information and helping deter electronic eavesdropping. The company serves clients that require stringent security standards, including compliance with TEMPEST and other intelligence community and DoD emanation protection requirements, and it has deployed its technology at more than 1,300 locations. In addition to products, Signals Defense provides expertise to help organizations protect buildings from RF/IR/UV threats while also offering decorative films and custom window coverings to improve office appearance. Recent development includes the acquisition of Signals Defense by Lockmasters, Inc., announced in April 2025.

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