Melt infiltration involves wicking molten silicon into a porous fiber preform to form the ceramic matrix, typically producing a matrix with a residual free-silicon content. Chemical vapor infiltration (CVI) instead deposits the matrix material from a gas phase over many hours, producing a matrix with essentially no free silicon but requiring longer processing times. The representative filing in this dataset, from General Electric, combines both: a melt-infiltration substrate with a CVI outer layer, which is a common strategy for balancing cost against high-temperature performance.

This dataset shows filings peaking at 88 in 2017 and falling to 9 by 2026, with 2022 near the midpoint at 54. That pattern, combined with every tracked assignee showing flat or negative recent-year momentum, suggests the core process routes — melt infiltration, PIP and CVI — were substantially claimed by major aerospace suppliers in the mid-2010s. Publication lag of roughly 18 months means the very latest years are understated, but the multi-year downward trend predates any lag effect.

Rolls-Royce (through its High Temperature Composites subsidiary and parent entity), General Electric, Raytheon Technologies (formerly United Technologies), and Safran Ceramics all appear as significant assignees in this corpus. Recent-year momentum has slowed sharply across all of them, with Raytheon down 71% and General Electric down 83% year on year, and several others at zero recent filings, indicating these are established rather than newly aggressive filers in this space.

Filing density is comparatively thin in areas like repair processes for in-service CMC components, cooling-channel integration within CMC parts, and control of nanolayered matrix microstructures, relative to the dense core coverage of melt infiltration and CVI densification themselves. These branches sit adjacent to well-established high-citation prior art, such as the repair-method and cooling-channel patents in this corpus, but have not been claimed as exhaustively. That makes them a reasonable starting point for teams looking for open claim scope rather than crowded territory.

F01D, the classification covering turbines and non-positive-displacement engines, appears in 239 of the 885 records in this dataset, second only to the core ceramics classification itself. That overlap reflects the primary commercial driver for CMC manufacturing process patents: turbine blades, shrouds, combustor liners and other hot-section components in aero engines, where CMCs replace heavier metal superalloys. Filers active in this space, including Rolls-Royce, General Electric and Raytheon, are aerospace and propulsion companies rather than general ceramics manufacturers.