This article reconstructs the development of Kurt Walter Zeidler's argument for a reformulation of Kant's transcendental dialectic as a theory of the foundation of transcendental logic. It therefore examines his doctoral dissertation "Logik des Erkenntnisprozesses. Dedukton - Induktion - Abduktion" (1979), where he discusses Norwood Russell Hansons 'logic of discovery' and finds an analogy between Charls S. Peirce's definiton of 'abduction' and Hegel's defintion of 'analogy', as well as his early papers, collected in "Grundlegungen. Zur Theorie der Vernunft und Letztbegründung" (2015), and his habilitation dissertation "Vernunft und Erfahrung. Untersuchungen zum Erkenntnisproblem in Philosophie und Wissenschaftstheorie" (1986), where he first seeks to verify the claim of Hegel and Peirce, that the synthetical unity of apperception is to be analyzed as a unity of three forms of syllogism corresponding to Aristotle's three figures of syllogism, through a close study of Kant's transcendental deduction of the categories as well as of the transcendental ideas, before he comes to reformulate these deductions in the light of the original unity of sensuality and understanding. The development of this argument is critically examined in three respects, first, in reference to Zeidler's reading of Peirce, Hegel and Schelling, second, with respect to Zeidler's analysis of scientific rationality as well as of the architectonic of the Critique of pure reason, and third, in view of the influence of Erhard Oeser and Erich Heintel on Zeidler's thought.