Description This document establishes oxygen-interrupted carbon backbones as a structural admissibility condition for liquid energy carriers claiming drop-in performance in compression-ignition systems, including diesel, jet, and marine applications. The analysis is non-constructive and does not disclose molecular structures, synthesis routes, blending ratios, additives, processing methods, or engine calibration strategies. Instead, it defines invariant structural conditions under which a liquid fuel can simultaneously achieve cold-flow disorder, compression-ignition survivability, and infrastructure compatibility without reliance on stabilizing additives or procedural compensation. Claims of drop-in liquid energy performance across real operating envelopes necessarily traverse this structural boundary. This condition constrains patentability at the level of enablement, inventive step, and industrial applicability.
Jorge Vasconcelos (Thu,) studied this question.