These patents cover MOF-based materials and devices designed to remove contaminants from gas or water streams, including adsorptive gas purification, atmospheric water harvesting, and wastewater treatment. The claim scope in this dataset spans both the underlying MOF composite chemistry and the device architectures that host it, such as packed beds, open-channel supports, and composite filter media. Most activity concentrates in gas-phase separation (B01D) and catalytic/chemical processing (B01J) rather than pure water treatment.

Filing activity in this dataset is spread across universities, national research institutes and a handful of corporate filers, with several French research institutions showing the strongest co-assignee collaboration links. No single entity dominates filing volume outright, and recent-year momentum data shows most of the historically active filers with zero filings in the latest year — consistent with either a genuine slowdown or the normal 18-month publication lag masking recent activity. Readers should treat any single-year ranking as provisional until later filings publish.

Filing density is high in the core adsorption and separation subclasses (B01J, B01D), which indicates that claim space around basic MOF composite chemistry and standard device formats is already occupied — not that the technology itself has reached mature, low-risk commercial deployment. The presence of a 2025-filed spacecraft air-scrubbing patent alongside decade-old water-harvesting patents suggests the field is still actively finding new application niches even as the core chemistry claims are crowded. Thin coverage in adjacent branches like nanotechnology-format adsorbents (B82Y) points to continued early-stage exploration rather than settled maturity.

The thinnest-claimed branches in this dataset are nanotechnology-integrated MOF formats and fuel-adjacent purification applications, each represented by single-digit-to-low-teens record counts compared to over a hundred in the core separation subclasses. A defensible new claim in these areas would likely need to combine a specific support geometry or nanostructure with a named contaminant class or operating regime, rather than claiming the base MOF chemistry, which is already densely covered. Co-assignee collaboration is also limited to about ten pairs across the whole dataset, suggesting room for joint-filed claims that bridge material science and device engineering.

US20250205676A1, filed by Blue Origin Manufacturing in mid-2025, claims an open-channel architecture that integrates MOF adsorbents onto an oxide-coated titanium support — specifically a titanium dioxide nanotube surface layer on a thin sheet or wire mesh — for regenerative CO2 removal in spacecraft cabin air. The claim scope is tied to that specific support geometry and open-channel gas-flow design, not to the MOF chemistry itself or to packed-bed configurations. Anyone building a similar air-scrubbing system with MOF-on-metal-support architecture should check their support geometry and flow path against this filing before finalising a design.