Silent Sentinel

Silent Sentinel Ltd. (trading as Silent Sentinel; US division styled Silent Sentinel Inc.) is a UK-based designer and manufacturer of long-range surveillance cameras, founded in 2002 by Paul Elsey and headquartered at 1‑2 Riverside, Stanstead Abbotts, Ware, Hertfordshire. It is a private limited company (UK Companies House no. 04556945) that was acquired by Motorola Solutions (NYSE: MSI) in February 2024; terms were not disclosed. Size varies by source — PitchBook lists ~72 employees, Tracxn ~28–49, and Great.gov.uk bands it at 51–200 employees. No reliable public revenue figure is available; third-party estimates range from low single-digit millions to £10–50M and should be treated as unverified.

Operations. Silent Sentinel manufactures rugged, modular electro-optical surveillance platforms — long-range cooled (MWIR) and uncooled (LWIR) thermal PTZ cameras, HD/4K visible and ultra-low-light cameras, SWIR, laser range finders, illuminators and gyro-stabilised mounts. Named platforms include the Jaegar PTU and Aeron PTZ ranges, running the company's NexOS software. Customers are in military/defence, aviation, maritime and coastal surveillance, border and perimeter security, counter-UAS, and critical national infrastructure. It has had offices or assembly facilities in the US (St. Petersburg, Florida) and Dubai, UAE.

Litigation posture. Silent Sentinel appears once in the tracked data, solely as a defendant — consistent with an operating company defending against a patent assertion rather than asserting patents itself. The sole case, Cedar Lane Technologies Inc. v. Silent Sentinel Ltd. (No. 6:22-cv-00960), was filed 15 September 2022 by Cedar Lane Technologies, a well-known acquired-patent plaintiff, in the Western District of Texas before Judge Alan D. Albright — a plaintiff-friendly patent venue. The Stanford NPE Litigation Database lists patents including US 6,972,790 and US 6,473,527 in the suit.

Case context. Silent Sentinel answered, filed affirmative defences and counterclaims, and submitted a Rule 7 disclosure statement in October 2022. The parties filed a joint stipulation of dismissal on 12 October 2022, and the case was disposed. No other tracked patent suits involve the company.