In the case of Frey & Son, Inc. v. Cudahy Packing Company in 1920, the Supreme Court dealt with a dispute over patent rights and trade secrets related to meat-packing machinery. The plaintiff, Frey & Son, claimed that Cudahy Packing had infringed on their patented technology for chilling animal carcasses after slaughter. However, the defendant argued that they were using a different method which was not covered by Frey's patent but rather constituted a trade secret developed independently within their company. The court ruled in favor of Cudahy Packing Company stating that there was no infringement as it could not be proven beyond doubt that they used exactly same process or machine protected under plaintiff’s patents without any substantial changes or modifications. Furthermore, even if some similarities existed between both methods; mere similarity does not constitute infringement unless exact replication is demonstrated. This case set an important precedent emphasizing on clear demarcation between patents and trade secrets while also highlighting importance of concrete evidence in proving patent infringements.

The dissenting opinion in the case of Frey & Son, Inc. v. Cudahy Packing Company argued that the majority's decision to uphold a lower court ruling favoring Cudahy was incorrect due to an improper interpretation of contract law principles. The dissent contended that there was no explicit agreement between Frey and Cudahy regarding price adjustments based on market fluctuations, thus making it unjust for the courts to impose such terms retrospectively. Furthermore, they believed that even if such an understanding had been implied during negotiations, it should not be legally binding as it lacked specificity and mutual consent - fundamental elements required for a valid contract under law. They also disagreed with the majority’s view about trade usage playing a role in this case because evidence suggested both parties were aware of its non-applicability here given their past dealings which did not involve any adjustment clause or similar practice.