McCormick had strong reasons for believing that his patent should be extended. He was asking for no more than the Patent Office, on other occasions, had granted to other inventors. A patent was supposed to protect an inventor for fourteen years, and he had lost half of this time in making a better machine, and in finding out the best way to carry on the business. He had received from all sources nearly $24,000, and most of it had been swallowed up in expenses. He was still a poor man in 1848. He was no more than on the threshold of prosperity. And his peculiar difficulty, which gave him a special claim upon the Patent Commissioners, was the shortness of the harvest season. He had only three or four weeks in each year in which he could make experiments. For eight years McCormick's claim was tossed back and forth like a tennis ball between the Patent Office and Congress. This delay threw the door wide open to competition. A score of manufacturers built factories and began to make McCormick Reapers, with trifling variations and under other names. If McCormick had won his case, they would have had to pay him a royalty of $25 on each machine. Consequently, they combined against him. They hired lawyers and lobbyists, secured petitions from farmers, and raised a hue and cry that one man was "trying to impose a tax of $500,000 a year upon the starving millions of the world." One firm of lawyers in Cincinnati sent a letter to these manufacturers in 1850, saying that, "McCormick can be beaten in the Patent Office, and must be beaten now or never. If funds are furnished us, we shall surely beat him; but if they are not furnished us, he will as certainly beat us. Please, therefore, take hold and help us to beat the _common enemy_. The subscriptions have ranged from $100 to $1,000.... Send in also to Patent Office hundreds of remonstrances like this: We oppose the extension of C. H. McCormick's patent. He has made money enough off of the farmer."