The Electro-Chemical Engraving Co., Inc. v. Commissioner of Internal Revenue case in 1940 revolved around the issue of tax deductions for depreciation and obsolescence on patents owned by the plaintiff, Electro-Chemical Engraving Company (ECEC). The ECEC had purchased several patents related to their business operations and claimed a deduction for depreciation based on an estimated useful life of seventeen years, as well as additional deductions for obsolescence due to technological advancements that rendered some patents obsolete. However, the Commissioner of Internal Revenue disallowed these claims arguing that there was no evidence showing any decrease in value or usefulness over time nor any specific event causing sudden obsolescence during those taxable years. The Supreme Court ruled in favor of the commissioner stating that mere estimates without concrete proof were insufficient to claim such deductions under existing tax laws.

In the dissenting opinion for the Electro-Chemical Engraving Co., Inc. v. Commissioner of Internal Revenue case, it was argued that the majority's decision failed to properly interpret and apply tax law principles regarding capital expenditures and ordinary business expenses. The dissenting justices believed that the costs incurred by Electro-Chemical in developing new engraving processes should be considered as regular business expenses, deductible from gross income under applicable tax laws at that time. They disagreed with the majority's view which treated these costs as capital investments subject to depreciation over a period of years. According to them, this interpretation contradicted established legal precedents and unfairly burdened innovative companies like Electro-Chemical who invest heavily in research and development activities necessary for their survival and growth in a competitive market environment.