Werbos's 2004 'Object Nets' patent names LeCun twice in its body text, contrasting a 1985 'duality theory' derivation with Werbos's own 1974 one

paul-werbosyann-lecunarthur-brysonbackpropagationhistory-of-mlpatentspriority-vs-paternity

While searching for Werbos's unlocated 1994 book, a different Paul Werbos-authored primary surfaced: US Patent 6,708,160 B1, "Object Nets," filed 2000-04-06 and granted 2004-03-16, Werbos sole inventor. Part of the patent's text is structured as a "where did backpropagation's methods come from" history section, parallel in content to the kind of "new guide to the field" material the 1994 book is reported to contain. It names LeCun twice in its body text; the patent's reference list adds a third mention, the entry that pins which paper "LeCun (1985)" is: "Y. LeCun, Une procedure d'apprentissage pour reseau a seuil assymetrique, Proc. Cognitiva 85, p. 599–604, Paris, 1985."

First, in a comparison of recognition results:

"By the way, LeCun later developed a modified ZIP code recognizer, using much more prior information in a complex way, still with basic backpropagation, which performed only marginally better than Guyon et al on the Post Office data. It did significantly better on smaller, truncated data sets—as one might expect."

Second, in a section on general derivations of backpropagation:

"LeCun (1985) showed that it could also be derived, in these cases, from an application of duality theory from control theory (Bryson and Ho, 1969). However, these derivations do not cover the general case, which I derived more directly from fundamental principles in 1974 (Werbos, 1994)."

Both passages cite "(Werbos, 1994)" — the book named in question-does-werbos-1994-roots-of-backpropagation-or-2006-retrospective-mention-lecun — in the immediate vicinity of the LeCun mentions, once explicitly directing the reader to it for further discussion of this history. This does not establish that the 1994 book itself names LeCun (a different, later document is quoted here), but it establishes that Werbos's own self-accounting of backpropagation's origins does engage LeCun directly, pitting a "duality theory" derivation he attributes to LeCun's 1985 paper — citing Bryson and Ho's 1969 control-theory textbook as its basis — against his own, broader 1974 derivation. See also claim-werbos-2006-ad2004-chapter-never-mentions-lecun, a different Werbos document, two years earlier chronologically, that does not mention LeCun at all.

[unverified-mechanism] — the characterization of LeCun's 1985 method is Werbos's own, in a document arguing for his own priority, not independently checked against LeCun's 1985 paper. [unverified-quant] — the "only marginally better than Guyon et al" comparison rests entirely on this same patent's prose.