How King Gillette Invented the Modern Disposable Safety Razor

King Gillette's 1904 patent for a safety razor with a thin, replaceable, double-edged blade that changed how the world shaves.

What it covers

The patent describes a safety razor design featuring a thin, flexible, double-edged blade held securely between a guard and a handle. By using a clamping mechanism, the device forces the thin metal blade to curve slightly, which provides the necessary rigidity for shaving while keeping the sharp edge at a safe angle against the skin. This design allows the user to dispose of the blade once it becomes dull, rather than needing to sharpen a heavy, permanent straight razor.

What it doesn't cover

• —Does not cover traditional straight razors that require manual honing and stropping.
• —Does not cover electric shaving devices or motorized hair-cutting mechanisms.
• —Does not cover razors that use a single, thick, non-replaceable blade integrated into the handle.
• —Does not cover the chemical composition of the steel used in the blades.

The clever bit

The innovation was realizing that by making the blade extremely thin and flexible, it could be mass-produced cheaply and then 'stiffened' into the correct shape simply by clamping it into the razor head.

Why it matters

This invention fundamentally shifted the grooming industry from a service-based model, where men visited barbers for shaves, to a consumer-product model. It created the 'razor and blades' business model, where the razor is sold cheaply to lock the customer into buying recurring, proprietary blade replacements.

Real-world examples

• 1.Gillette safety razors
• 2.Modern double-edge safety razors
• 3.Disposable cartridge razor systems