HEFA stands for hydroprocessed esters and fatty acids, a process that converts triglyceride feedstocks such as vegetable oils, animal fats and used cooking oil into paraffinic hydrocarbon fuel through catalytic deoxygenation and isomerization. It differs from processes like Fischer-Tropsch synthesis or alcohol-to-jet in that it starts from lipid feedstocks rather than syngas or ethanol. In this patent dataset, HEFA-specific claim language overlaps heavily with food, feed and pharmaceutical classifications because the underlying fatty-acid chemistry is shared across those applications.

The ranked assignee list covers 100 companies, with one clear leader holding 573 families — well ahead of fifth place at 164 and tenth place at 117. However, the top 5 assignees combined account for only 16.7% of all 10,125 records in scope, and the top 10 for 23.2%, meaning there is no small group controlling the field. A long tail of single- and few-filing entrants holds the remainder, which matters for anyone assessing competitive risk beyond the largest few names.

No — filing activity peaked in 2018 at 394 records and has declined since, reaching a midpoint of 187 in 2022 and continuing lower. This pattern suggests the broadest early process claims around deoxygenation and isomerization have already been filed, and that current activity is more incremental. The most recent year's figures are partial because publication typically lags filing by around 18 months, so the true recent trend is likely somewhat higher than shown.

Filing density is comparatively thin in specific sub-areas including phosphorus removal from variable feedstocks, cold flow property tuning through isomerization catalyst design, co-processing ratio optimisation with conventional diesel streams, and impurity tolerance for waste-oil feedstocks. These sit adjacent to the dense core deoxygenation and catalyst claims but are not as heavily occupied. A first claim in these areas would likely need to tie a specific catalyst formulation or process parameter to a measurable feedstock or fuel-property outcome to clear the existing art.

This landscape counts 10,125 patent families rather than raw publication counts, which is the fairer unit because it neutralises the effect of continuations and multi-jurisdiction filing by the same applicant. Receiving office data shows the United States, European Patent Office and WIPO's PCT system as the largest venues, with Canada, Australia and the United Kingdom also well represented. Using families rather than raw filings avoids overstating the activity of applicants that file aggressively across jurisdictions for the same invention.