In Patent Law, a "Group of Three Blades" Can Mean Four Blades
The four-bladed QUATTRO® razor may infringe Gillette's patent on a razor with "a group of first, second, and third blades" according to a decision issued today by a Federal Circuit panel. Gillette Co. v. Energizer, (Fed. Cir. 4/29/05, No. 04-1220).
Gillette has a patent (U.S. Patent No. 6,212,777) on an improved safety razor in which more than two blades are arranged at varying distances from the skin so that a close shave is obtained while reducing friction. Gillette sued Energizer Holdings, Inc. (Energizer) in the United States District Court for the District of Massachusetts alleging Energizer’s QUATTRO®, a four-bladed wet-shave safety razor, infringed the '777 patent. Gillette moved for a preliminary injunction to enjoin Energizer from making and selling the QUATTRO®. The district court denied Gillette’s motion, finding that Gillette had not shown a reasonable likelihood of success on its claim of literal infringement. The trial court primarily based its decision on the conclusion that the terms “first,” “second,” and “third” of claim 1 limited the scope of that claim to a razor having solely three blades. Gillette appealed the ruling denying the preliminary injunction.
The Federal Circuit panel ruled that the district court erred in construing the claims of the ’777 patent to cover only three-bladed safety razors, and therefore vacated the district court ruling denying Gillette's motion for preliminary injunction and remanded for further proceedings
The panel relied on several principles of patent law in reaching its decision that the claim language "safety razor blade unit comprising a guard, a cap, and a group of first, second, and third blades" could encompass a four-bladed razor:
- The patent claim used the open-ended terms "comprising" and "a group of" -- in patent claim construction, these terms allow the addition of other elements of the group;
- The specification included language indicating that the arrangement of the blades and not the number of blades was the invention;
- Certain claims referred to "a span" between the first and second blades rather than "the span" - this indicated to the panel that more than one span could exist;
- When discussing the "first", "second" and "third" blades, the claim did not discuss them in order, indicating there was no numerical limitation implied;
- The first sentence of the written description of the invention teaches that “the invention . . . relates in particular to safety razors having blade units with a plurality of blades";
- Although the specification referred repeatedly to three blades, this was only a preferred embodiment of the invention that could not be used to limit the claims.
In a persuasive dissenting opinion, Senior Circuit Judge Archer disagreed with the majority. Judge Archer argued that the multiple references to three blades was more than a preferred embodiment, but was the invention.
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