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      • Mixed Type Claim
      • Non establishment of a Search Report
      • Problem-and-solution approach
      • Further technical effect
      • Inventive Step
      • Clarity of a claim
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      • T 208/84 computer-related invention / VICOM
      • T 1173/97 Computer Program Product / IBM
      • T 0690/06 Financial records / AUKOL
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      • Standard Elemente
    • German Court Decision
      • BGH X ZR 37/90 "Beheizbarer Atemluftschlauch)
      • BGH X ZR 38/06 „Pipette system“
      • BGH X ZR45/05 "Railroad tyre"
    • Case Study: The gasoline engine
      • Prior Art of Otto's four stroke engine
        • The Barnett engine
        • The Lenoir gas engine
        • The Hock Petroleum Engine
        • The Beau de Rochas engine
      • The atmospheric gas engine of Langen and Otto
        • Comparison of the running costs of engines
        • Energy costs in 1876
        • The Early Beginnings of the Town Gas Industry
        • History of Gas works in Germany
        • Gas prices in Germany, Austria, Hungary and Switzerland in 1886
        • History of town gas in France
      • Deutsches Reichspatent N° 532
        • General deficiencies of Otto's patent today
        • Claim category
        • DE N° 532 - Claim 1
      • Nullity Proceedings in 1884
      • Otto's miscomprehension or vision?
      • Reviews of the 4 stroke engine
        • Otto's silent gas machine (1878)
        • 1885 - Vienna Exhibition and Dresden Exhibition for small trade
        • On the Explosion of Homogeneous Gaseous Mixtures (1886)
        • Wiebe function
        • The engines at the Munich engine and working engines exhibition 1888
      • Deutsches Reichspatent N° 2735
      • Deutsches Reichspatent 14254
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Reviews of the 4 stroke engine

1877 Otto's silent gas machine

1885 Vienna exhibition and Dresden exhibition for small engines 

1888 The engines at the Munich engine and working engines exhibition

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  • EPO Practice
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  • Case Study: The gasoline engine
    • Prior Art of Otto's four stroke engine
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    • Deutsches Reichspatent N° 532
    • Nullity Proceedings in 1884
    • Otto's miscomprehension or vision?
    • Reviews of the 4 stroke engine
      • Otto's silent gas machine (1878)
      • 1885 - Vienna Exhibition and Dresden Exhibition for small trade
      • On the Explosion of Homogeneous Gaseous Mixtures (1886)
      • Wiebe function
      • The engines at the Munich engine and working engines exhibition 1888
    • Deutsches Reichspatent N° 2735
    • Deutsches Reichspatent 14254
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