Summary

Mahlon Pitney Hanover Star Milling Company v…

Into whatever markets the use of a trademark has extended, or its meaning has become known, there will the manufacturer or trader whose trade is pirated by an infringing use be entitled to protection and redress. But this is not to say that the proprietor of a trademark, good in the markets where it has been employed, can monopolize markets that his trade has never reached, and where the mark signifies not his goods, but those of another.
Source: Wikisource

Mahlon Pitney Hanover Star Milling Company v…

As the common law of the several states has the same origin for the most part, and as their law concerning trademarks and unfair competition is the same in its general features, it is natural and very generally correct to say that trademarks acknowledge no territorial limits. But it never should be forgotten, and in this case it is important to remember, that when a trademark started in one state in recognized in another it is by the authority of a new sovereignty that gives its sanction to the right. The new sovereignty is not a passive figurehead.
Source: Wikisource

Mahlon Pitney Hanover Star Milling Company v…

But Metcalf's purpose to take advantage of the reputation of the Hanover Company's Tea Rose flour is so manifest, and the tendency of the similarity of the brand and accompanying design, and of the make-up of the packages, to mislead ultimate consumers, is so evident, that it seems to us a case of unfair competition is made out. The circumstances strongly indicate a fraudulent intent to palm off the Steeleville Tea Rose flour upon customers as being the same as the Tea Rose flour made by complainant, the reputation of which is shown to be so well established.
Source: Wikisource

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