The dataset's leading assignee holds 79 of the 601 records in scope, well ahead of the fifth-ranked holder at 21 and the tenth at 16. The top 5 assignees combined account for 30.6% of all records, and the top 10 combined reach 45.6%, which means over half the field is spread across a long tail of smaller filers, government entities and individuals. This concentration pattern suggests one dominant filer with a wide competitive gap behind it, rather than several firms fighting over the same claims.

Filings peaked at 70 in 2019 and declined to 27 by 2024, down 48% from the 52 filed in 2021 — the most recent years with complete publication data. Because patent publication typically lags filing by around 18 months, the 2025-2026 figures shown in raw counts understate actual filing activity and should not yet be read as a continuation of the decline. A fair read is that activity cooled from its 2019 peak through 2024, with the true 2025-2026 trend still emerging.

The search string captures records containing boost, glide and guidance terminology together, or the explicit phrase, which pulls in genuine hypersonic vehicle filings alongside biomedical and drone records that use overlapping vocabulary for unrelated purposes. That is why A61K medicinal preparations (19.5% of 601 records) and C07K peptides (15.8%) rank above core aerospace classes like B64C aeroplanes (14.8%). Anyone using this dataset for vehicle-technology freedom-to-operate work should filter to the B64C, B64D, B64G, F42B and B64U subclasses first.

US9639085B1, assigned to the US Air Force and filed in 2017, claims a method for plotting hypersonic glide trajectories along the peaks of phugoid oscillations rather than following a damped, smooth glide path. The technique calculates one altitude that produces a maximum lift-to-drag trajectory with small oscillations, then a second altitude producing larger phugoid peaks, and plots a path connecting the two to reduce total heat load with minimal loss of range or time to distance. Anyone designing hypersonic glide trajectory logic that deliberately rides phugoid peaks for thermal management should review this claim scope closely.

Relative to the dense core classes, sub-areas such as drone-class (B64U) guidance integration, cooperative multi-vehicle glide guidance, and crossover claims between ammunition trajectory shaping (F42B) and spacecraft re-entry guidance (B64G) show thinner filing density in this dataset. Thin density signals unclaimed or lightly claimed space, not that the underlying technology is unproven or unimportant. Teams should treat these as starting points for freedom-to-operate research rather than confirmed open ground, since a broader non-family search may surface additional relevant filings outside this 601-record set.