Arm & Hammer we all know!

But Cow Brand . . . I believe that's gone by the wayside. From the A&H website:

John Dwight and Company is officially formed. In 1876, he goes on to adopt the Cow Brand as a trademark for Dwight's Saleratus (saleratus is latin for aerated salt, another term for baking soda). Lady Maud, a prize-winning Jersey cow at the Philadelphia Centennial Exposition, is chosen as the icon for the product due to the popularity of using saleratus with sour milk in baking. For many years the Cow Brand and the ARM & HAMMERâ„¢ brand are sold simultaneously. Both brands were equally popular, each boasting its own loyal following.