Small gains, significant value: Patenting aircraft efficiency innovations

On a per-capita basis, Australia ranks second worldwide[1] for domestic aviation CO₂ emissions — a proxy for aviation fuel consumption. The importance of aircraft efficiency is likely to increase further as airlines pursue ultra-long-haul routes such as Qantas’ non-stop Sydney-London service, scheduled to commence in 2027.

Key areas of efficiency innovation

Fuel-saving technologies can broadly be grouped into three areas: aerodynamic efficiency, propulsion efficiency and weight reduction.

Key aerodynamic innovations include wingtip devices such as winglets, which reduce fuel burn by mitigating induced drag associated with wingtip vortices. Although winglets are now common on commercial aircraft, wingtip technology remains an active area of patenting, with approximately 75 patent publications each year.[2]

Propulsion innovations include advances in turbofan efficiency, enabled in part by advanced materials capable of withstanding greater thermal and mechanical loads. Higher operating temperatures improve thermal efficiency, while larger fan diameters can support higher bypass ratios, generating thrust more efficiently by moving a greater mass of air at a lower velocity. Patenting activity reflects the continuing development in this field: WIPO identified approximately 1,200 patent family publications relating to efficient aircraft turbines in 2023, more than four times the 2000 figure of 286.[3]

Weight-reduction technologies centre on new materials, optimised geometries, improved joining techniques and manufacturing methods that enable lighter, more integrated structures. Composite fuselage structures are a prominent example, with continuing patent activity across materials, structural arrangements and manufacturing techniques. Patent publication data[4] identify Boeing and Airbus among the leading innovators in lightweight composite fuselage technology.

The commercial value of aircraft efficiency improvements is amplified by scale. A relatively small reduction in drag, weight or fuel consumption can produce substantial savings when repeated across thousands of flight cycles or an entire aircraft fleet. Patent strategy should therefore account for incremental improvements to established aircraft technologies.

Protecting incremental aerospace improvements

Certain features of Australia’s patent system are particularly well suited to protecting incremental aerospace innovations.

Although Australian law permits multiple prior art references to be combined for inventive step, in our experience Australian examination practice is less inclined than US practice to rely on mosaicking multiple documents. This can be significant in mature technical fields, where commercially valuable advances build incrementally on established technology.

Incremental aerospace development can also make an applicant’s own earlier disclosures relevant to later innovations. Australia’s generous 12-month patent grace period can therefore be valuable where a later development builds on previously disclosed technology. Where the grace period applies, an applicant’s earlier disclosure, including an earlier patent publication, made within 12 months before filing the complete application can be disregarded when assessing novelty and inventive step.

Australia’s reliance on long-distance air travel creates a commercial incentive for aircraft efficiency improvements, while its patent system offers advantages for protecting incremental developments. Aerospace innovators should therefore consider Australia in their broader filing strategies, including for improvements to established technologies that may face greater patentability hurdles elsewhere.