Freedom to Operate in Indoor Positioning: A Pre-Launch Checklist for RTLS Startups
Before you ship a tracking product, find out whether the spatial stack underneath it is already patented. Here is how to check, and what it costs to get it wrong.
Hayat AminPresident of IP, Position Imaging
7 min read
Freedom to operate (FTO) means you can sell your product without infringing someone else's live patent. In indoor positioning that bar is high, because the core methods for real-time location, sensor fusion and indoor navigation were filed and granted years ago. Run an FTO check before launch: map your signal chain, search the active families that cover it, and decide whether to design around them or license them. Licensing is usually faster and cheaper than a redesign, and it removes the legal letter that tends to arrive right after you get traction.
Key takeaways
- FTO is about other people's live patents, not whether your own idea is novel.
- Real-time location, sensor fusion and indoor navigation are densely patented. Assume coverage until you have checked.
- A redesign to avoid a patent can cost more engineering time than the product itself.
- Licensing proven IP gives you a defensible answer for buyers, investors and acquirers.
- Do the FTO check before launch, not after the cease-and-desist letter shows up.
What freedom to operate actually means
Freedom to operate is a simple idea that founders often get backwards. It does not ask whether your invention is new. It asks whether selling your product would step on a patent that someone else already owns and keeps alive.
Those are two different questions. You can build something genuinely original and still infringe, because a granted patent covers a method or a system, and your original product might use that method to work. A vision team can write every line of code from scratch and still land inside a claim that was filed in 2016.
For anything that locates a person, a package or an asset indoors, this matters more than in most fields. The math and the system design for real-time location were worked out and protected over the last two decades. The result is a dense map of live patents sitting underneath the feature you are about to ship.
Why indoor positioning is a minefield
GPS stops working the moment you walk through a door. To replace it indoors, every real-time location system (RTLS) leans on a handful of techniques, and each one has prior art with teeth:
- Radio-frequency ranging measures distance from signal timing or strength. The calibration routines and the multi-node geometry that make it accurate are patented.
- Sensor fusion blends radio, inertial and vision data so the position stays stable when one signal drops. The fusion logic is patented.
- Indoor navigation and mapping turn raw position into a usable route through a building. That layer is patented too.
When a startup says "we built our own positioning engine," they usually mean they re-derived methods that already exist and are owned. The engineering is real. The freedom to sell it is the open question.
A five-step FTO checklist before you launch
You do not need a six-figure legal opinion to start. You need a disciplined first pass.
- Map your signal chain. Write down every step from raw sensor to the position you show a user. Radio capture, ranging, calibration, fusion, mapping, navigation. Each step is a place a claim can attach.
- List the claims, not the products. Search granted patents for the methods in your chain, not for competitor brand names. Patents are written around methods.
- Filter to live and in-force. A patent only blocks you if it is granted, unexpired and maintained. Expired or abandoned filings are free to use.
- Check the assignee and the citations. Heavily cited families owned by active companies are the ones that get enforced. A patent cited by Apple or Bosch is a patent people take seriously.
- Decide: design around, license, or stop. For each live family that reads on your product, you either engineer a path around it, license it, or change what you are building.
Most teams discover that designing around the core positioning families is harder than the product itself, which is what makes licensing the rational call.
The real cost of getting it wrong
Skipping the FTO check does not make the risk go away. It just moves it to the worst possible moment.
The letter tends to arrive after you launch, because that is when you become visible and when you have revenue worth a claim. By then you have shipped, told customers it works, and built a roadmap on top of the very method in dispute. Your options shrink to settling, redesigning under deadline, or pulling the feature. All three are expensive and all three are public.
The team that licensed the foundation is already selling. The team that skipped the check is now in a deposition.
Investors and acquirers know this. In diligence, "who owns the IP under your core feature" is a question that can re-rate a deal. A clean, licensed answer is an asset. A shrug is a discount.
License the foundation, build the part only you can
There is a faster path than rebuilding or risking it. The spatial, vision and tracking foundation under most products has already been solved, filed and proven. You can license that layer and put your money where it actually differentiates you.
Position Imaging holds hundreds of patents across radio-frequency positioning, computer vision, machine learning and indoor navigation, including families such as US 11,774,249 and US 12,079,006. Licensing them gives you three things a redesign cannot: a system that works on day one, freedom to operate on the covered methods, and a credible answer when a buyer or investor asks who owns the ground you are standing on.
If you are building anything that tracks the physical world, the smart first move is not to start coding. It is to find out what is already covered, and decide what you actually need to own.
Frequently asked questions
What is the difference between freedom to operate and patentability?
Patentability asks whether your own idea is novel enough to be granted a patent. Freedom to operate asks whether selling your product would infringe a patent someone else already holds. You can have one without the other. A novel product can still infringe a live patent on a method it uses.
Do I need freedom to operate if my code is original?
Yes. Patents cover methods and systems, not source code. You can write every line yourself and still fall inside a granted claim if your product uses a patented method to function. Original code does not grant freedom to operate.
Is it cheaper to design around a patent or to license it?
In indoor positioning it is usually cheaper to license. The core families cover the methods that make real-time location accurate, so designing around them often means rebuilding the part of your system that makes it work. Licensing gives you a working, defensible foundation without that engineering cost.
When should an RTLS startup run a freedom-to-operate check?
Before launch, ideally before you commit your architecture. Running it early lets you license or design around a patent while changes are cheap. Running it after launch, when the cease-and-desist letter arrives, leaves you with only expensive options.
Find out which positioning patents already cover what you are building.
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