Holland Furniture Co. v. Perkins Glue Co.
Headline: Patent for a starch-based wood-veneering glue is limited by the Court, which ruled the broad product claims invalid and lets competing glue makers continue selling similar starch glues.
Holding: The Court reversed, holding Perkins’ broad product claims invalid because they claim a glue by its function rather than by a definite starch ingredient, so other makers of similar starch glues are not excluded.
- Prevents Perkins from blocking others who make similar starch glue.
- Allows competing manufacturers to sell cassava-based veneer glue made with three parts water.
- Clarifies that product patents must describe specific ingredients, not just a product’s function.
Summary
Background
Perkins Glue Company sued to stop another glue maker from selling a starch-based glue said to infringe Perkins’ reissued patent for a starch glue useful in wood veneering. Perkins described a two-step method using a specially degenerated cassava starch combined with about three parts water and an alkali to produce a glue that behaved like animal glue. The patent included product claims (claims 28, 30, and 31) describing a glue “as good as animal glue.” Lower courts reached differing results and Perkins narrowed some process claims by disclaimer before this Court reviewed the product claims.
Reasoning
The Court focused on whether the patent sufficiently described the glue ingredient or simply claimed any glue that performed the same function. The opinion explained that previous patents and practices already showed methods for making starch glue and that Perkins’ real contribution was identifying a particular range of starch degeneration that produced a useful product. The Court held that describing the product only by its function—being “as good as animal glue” when mixed with three parts water—was too vague. Allowing such broad functional product claims would let the patentee exclude other starches and discourage further invention. The Court therefore found the product claims defective and reversed the lower court’s favorable ruling for Perkins.
Real world impact
The decision limits Perkins’ ability to block other manufacturers who use naturally low-absorbency starch or different methods to make similar glues. It requires product patents to identify specific ingredients or characteristics, not merely the product’s use or function. This lets competing glue makers continue commercial production of cassava-based veneering glues without being shut down by the broad product claims.
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