Reuse is a refurbishment-cost problem. On July 19, 2022, Blue Origin was granted US11391243B1, “Seal for gimbaling and/or fixed rocket engine nozzles, and associated systems and methods,” classified in F02K 1/805, the rocket-nozzle art. The inventors overlap with Blue Origin's broader propulsion IP. Blue Origin is privately held — there is no 10-K — so the business case lives in the public record and the patent trail.
The headline number in reusable launch is how cheaply a vehicle can fly a second time, and that number is dominated by refurbishment: the labor and parts needed to make flown hardware flight-worthy again. A rocket engine is a collection of components that each endure brutal heat and pressure. If a seal degrades on every firing, it has to be inspected and replaced — cost that accumulates across the engine and erodes the savings reuse was supposed to deliver.
That is why a nozzle-seal patent, unglamorous as it is, sits on the reuse cost curve. A seal engineered to survive gimbaling and repeated firings without replacement is one fewer part to refurbish between flights. Multiply that discipline across the whole engine and the difference between 'technically reusable' and 'economically reusable' is exactly this kind of component-level durability.
The honest caveat: a single seal patent does not prove an engine's refurbishment cost, and reuse economics are decided by the aggregate of hundreds of such parts plus inspection regimes. One claim is a data point, not a cost model.
But it points at the real battleground. Reusability is marketed on the booster and won on the bill of materials. A durable-seal patent is a small entry in the ledger that decides whether reuse actually lowers the cost per launch.