The market size is the story. On August 31, 2021, Northrop Grumman was granted US11104459B2, “Systems for capturing a client vehicle,” classified in B64G 1/646, the on-orbit capture art. The claim covers the hardware that lets one spacecraft physically grab another.

On-orbit servicing only generates revenue from satellites a servicer can reach and hold. Most existing satellites were never designed to be captured — no docking ring, no compatible interface. A capture system that works on standard, unprepared client features therefore directly enlarges the reachable fleet, and the reachable fleet is the servicing market.

“Capture assemblies and compliant extension assemblies may be utilized for insertion into a nozzle of a liquid engine of a spacecraft.”— U.S. Patent No. 11,104,459 source

For the orbital business desk, this reframes a capture patent as a TAM document. Each additional class of satellite the mechanism can grab — by interface, by size, by orbit — adds names to the list of potential paying clients. Conversely, a capture system that only works on purpose-built clients limits the business to satellites that have not launched yet.

The disciplined caveat: capturing an uncooperative, tumbling, or aging satellite is genuinely hard, and a granted patent proves the approach, not the success rate. A servicing TAM built on capture capability is only as real as the capture is reliable.

But that is exactly why the capture patent is the load-bearing IP in a servicing thesis. Docking rings and propellant matter, but the question that sizes the business is simpler: how many satellites can you actually grab? Northrop's capture claims are an answer to that question — and therefore to the size of the market.