The dataset's assignee ranking is led by a mix of established propulsion primes and defence-linked research institutes, including corporate names like General Electric, Mitsubishi Heavy Industries, United Technologies and Lockheed Martin alongside Chinese institutes such as the Beijing Institute of Astronautical Systems Engineering. Notably, every one of these leading assignees shows zero filings in the most recent tracked year, which given an 18-month publication lag likely reflects reporting delay rather than an actual halt in R&D. Anyone using this ranking for competitive tracking should treat it as a picture of historical depth rather than current-year activity.

Filings rose from 10 in 2017 to a peak of 17 in 2023, but the path was uneven — the 2022 midpoint sat at just 6 — and volumes have not held at the 2023 peak since. That pattern reads as a plateau rather than sustained growth. Because the 2026 figures are still incomplete due to publication lag, it is too early to call the recent dip a genuine decline, but there is no clear evidence of accelerating filing activity either.

The United States and China are the two dominant receiving offices, with 48 and 42 filings respectively, far ahead of Europe (14), India (10), Japan (6) and the PCT route (5). This concentration means most substantive claim positions in this field are being tested in US and Chinese patent offices first. A company building a defensive or freedom-to-operate strategy in hypersonic propulsion should prioritise searches in those two jurisdictions before extending to Europe or Japan.

Core propulsion claims under F02K dominate the corpus, appearing in 136 of 146 records, while adjacent areas like variable-geometry inlet actuation, active thermal protection cooling loops, and mode-transition control between scramjet and turbine operation appear far less often. Aircraft equipment and digital-processing content together account for only a small fraction of filings. That gap suggests vehicle-integration and control-software claims around scramjet propulsion remain comparatively under-claimed relative to the combustion and inlet hardware itself.

Collaboration is rare in this dataset: only two co-assignee pairs were identified across 146 patent families. The strongest pairing links two Chinese research institutes, the Beijing Institute of Astronautical Systems Engineering and the Beijing Power Machinery Institute, across six shared families, while a second pair appears only once. This means most patent positions in scramjet propulsion, whether held by corporations or institutes, were developed and filed independently rather than through joint ventures or cross-licensing arrangements visible in the co-filing record.