How the modern internal menstrual tampon was invented

Earle Haas's 1933 patent describes the first modern internal menstrual tampon, designed to be inserted into the vagina using a cardboard applicator.

What it covers

The patent describes a catamenial device, which is a medical term for a menstrual product. It consists of a compressed cylinder of absorbent material, such as cotton, designed to be inserted into the vaginal canal to absorb menstrual flow. The invention includes a tubular applicator that allows the user to insert the absorbent core hygienically without direct contact, which was a significant shift from external pads of the era.

What it doesn't cover

• —Does not cover external sanitary napkins or pads
• —Does not cover non-absorbent menstrual cups or discs
• —Does not cover chemical or pharmaceutical treatments for menstruation
• —Does not cover digital tampons that are inserted manually without an applicator

The clever bit

The innovation was the combination of a highly compressed, absorbent material with a simple, disposable cardboard applicator, making internal use both sanitary and easy for the average user.

Why it matters

This patent laid the foundation for the modern feminine hygiene industry. It provided a discreet and convenient alternative to bulky external belts and pads, fundamentally changing how millions of women managed menstruation in the 20th century.

Real-world examples

• 1.Tampax brand tampons
• 2.Most modern applicator-style tampons