Invalidity dossier
US 2281802
Apparatus for straightening the edge of a dough sheet preparatory to coiling
Current assignee: Baker Perkins Inc
Added 9/23/2026, 7:14:05 PM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 2,281,802 A
Title: Apparatus for straightening the edge of a dough sheet preparatory to coiling
Assignee/Original Assignee: Baker Perkins Inc., Saginaw, Michigan (a New York corporation)
Inventor: Albert O. Riordan, Saginaw, Michigan
Dates: Filed July 24, 1941 (Application Serial No. 403,850); patented May 5, 1942. Google Patents lists a 1959-05-05 anticipated expiration and status "Expired – Lifetime."
Classification: A21C 3/06 — Machines for coiling sheets of dough, e.g., for producing rolls.
Stated purpose: The invention relates to bakers' dough moulders and provides "an improved device for straightening the leading edge of a dough sheet preparatory to coiling it into cylindrical loaf form." More particularly, it is apparatus installable between two pairs of sheeting rolls of existing moulders for folding the rounded front edge of a dough sheet to form a straight edge.
Plain-language scope (per the described embodiments and claims): A stationary, steeply inclined guide member (a grooved or smooth plate, or parallel fingers) is mounted between the next-to-last and final pairs of sheeting rolls. It conducts the dough sheet from the upper rolls into the nip of the final pair and backs the sheet during folding. A yieldingly mounted hooked folding member, normally resting against the guide under light pressure, picks up the sheet's leading edge, directs it outwardly from the guide approximately horizontally or downwardly, and folds it back on the sheet. The final roll pair then flattens the fold (Figs. 3–5). Fold depth is set by the hook depth. The guide is preferably inclined "past the angle of repose of dough," so the sheet travels down freely by gravity. Seven claims recite combinations differing in claimed guide inclination and mounting. The patent states advantages: no separate folder conveyor or flattening rolls, no added dough working, suitability for tender doughs (e.g., rye), low-cost retrofit into existing moulders, and higher operating speeds.
What the excerpt does not establish: It is incomplete ("consult the source for omitted text"); images, full claim set, and any prior-art references or citations are not included. No litigation, ownership-transfer, validity, or prior-art conclusions are drawn or supported here.
Generated 10/1/2026, 9:42:16 PM
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Litigation summary
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PTAB challenges
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Assignment history
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Prior art
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Obviousness
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Extensions
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Derivative works
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