An asymmetric supercapacitor pairs two electrodes made from different materials or storage mechanisms — typically a battery-like faradaic electrode and a capacitor-like electrostatic electrode — in a single cell. This combination widens the operating voltage window and increases energy density compared with a symmetric design, where both electrodes use the same material. In this patent dataset, the pairing is frequently combined with miniaturized or on-chip device architectures, which is why capacitor claims (H01G) and battery-related claims (H01M) both appear across a meaningful share of the 56 tracked families.

The filing trend in this dataset peaked at 14 records in 2018 and had fallen to 4 by the 2022 midpoint, with no recovery visible through the data cut-off. This pattern is consistent with a field where the foundational device architectures and electrode chemistries were claimed early, leaving later entrants fewer open angles to file around. Publication lag of roughly 18 months means the very latest years will always understate true filing activity, but the multi-year decline from 2018 predates that lag and points to a genuine slowdown rather than a reporting artifact.

Academic and research-institute assignees are prominent in this dataset, including university groups working alongside an energy-technology company in the field's strongest co-assignee pairing, which spans 10 shared filings. The Regents of the University of California holds the most-cited family in the corpus, centered on a porous interconnected corrugated carbon-based network composite. None of the tracked assignees show filing activity in the most recent year, suggesting current leadership is based on legacy claims rather than fresh filing momentum.

US11810716B2, assigned to The Regents of the University of California and granted in November 2023, claims a porous interconnected corrugated carbon-based network (ICCN) composite with metallic nanoparticles disposed in its pores, along with two fabrication routes — a light-exposure-only method and a light-exposure-plus-electrodeposition method. It also claims a capacitor built from two such electrodes separated by an electrolyte. Anyone designing a carbon-network electrode with embedded metallic nanoparticles fabricated by either of those two routes should review this family closely for overlap; electrode designs using different fabrication chemistry or non-metallic pore fillers sit outside its literal claim scope.

The IPC distribution shows H10N (other electric solid-state devices) at only 4 records and C09D (coatings, paints and inks) at just 2, both far below the 43-record H01G core and the 12-18 record range of the inorganic chemistry classes. That gap suggests solid-state micro-device integration and coating-based interface engineering are comparatively under-claimed relative to the dense capacitor and electrode-chemistry territory. A first claim in these branches would need to tie a specific solid-state or coating mechanism to the asymmetric device architecture to avoid overlapping the existing H01G-heavy claim base.