In the case of Quinby v. Conlan, the Supreme Court of the United States was asked to decide whether a contract between two parties was valid and enforceable. The contract in question was between Quinby and Conlan, and it stated that Conlan would pay Quinby a certain amount of money in exchange for the use of a patent. The Supreme Court held that the contract was valid and enforceable. The Court noted that the contract was clear and unambiguous, and that it was supported by consideration. The Court also noted that the contract was not against public policy, and that it was not illegal or fraudulent. The Court also held that the contract was binding on both parties, and that Conlan was obligated to pay Quinby the amount of money specified in the contract. The Court noted that Conlan had accepted the terms of the contract and had acted in reliance on it, and that he was therefore bound by its terms. In conclusion, the Supreme Court held that the contract between Quinby and Conlan was valid and enforceable, and that Conlan was obligated to pay Quinby the amount of money specified in the contract.

Justice Field delivered the dissenting opinion in Quinby v. Conlan, arguing that the majority's decision was contrary to established precedent and would lead to an unjust result. He argued that a contract for personal services is not necessarily void because it does not specify a definite period of time, as long as there are no other circumstances which render it illegal or immoral. In this case, he noted that both parties had agreed on all terms of their agreement except for its duration; thus, they should be held to those terms until one party chooses to terminate them by giving reasonable notice. Furthermore, Justice Field argued that even if the contract did lack mutuality due to its indefinite term length - meaning either party could choose when and how long they wanted it enforced - such contracts were still enforceable under California law at the time of this dispute. Therefore, he concluded that since neither party had given any indication of wanting out before Conlan sued Quinby for breach of contract in 1876 (over two years after entering into their agreement), then Quinby should have been allowed to continue performing his duties until proper notice was provided by Conlan or another circumstance arose which rendered their agreement unenforceable