# How Jacob Schick Invented the Modern Magazine-Loading Safety Razor

> A 1929 patent for a safety razor that uses a replaceable blade magazine, allowing users to change blades without touching the sharp edges.

- **Patent:** US 1721530
- **Original title:** Shaving implement
- **Owner:** Individual
- **Granted:** 1929
- **Status:** Public domain (expired)
- **Times cited:** 2
- **Field:** consumer_electronics, mechanical

## What it does

This patent describes a shaving implement designed to hold a stack of blades in a magazine. The mechanism allows a user to feed a new blade into the shaving head while simultaneously ejecting the old, dull blade. By using a mechanical slide or plunger, the device ensures the blade is properly seated and aligned without the user ever needing to handle the dangerous metal edges directly.

## What it does NOT cover

- Does not cover standard double-edge safety razors that require manual blade assembly.
- Does not cover electric shaving motors or oscillating blade mechanisms.
- Does not cover disposable plastic razors where the entire head is discarded.

## The clever bit

The innovation lies in the magazine-fed design, which separates the storage of sharp blades from the act of shaving, effectively turning a hazardous maintenance task into a simple mechanical operation.

## Real-world examples

1. Schick Injector razors
2. Vintage magazine-loading safety razors

## Why it matters

Jacob Schick's invention fundamentally changed personal grooming by introducing the concept of the replaceable blade magazine. This design reduced the risk of cuts and made blade replacement a quick, sanitary process, laying the foundation for the Schick brand's long-term dominance in the shaving market.

## Frequently asked questions

### What does How Jacob Schick Invented the Modern Magazine-Loading Safety Razor cover?

A 1929 patent for a safety razor that uses a replaceable blade magazine, allowing users to change blades without touching the sharp edges.

### Who owns patent US 1721530?

Individual owns this patent, granted in 1929.

### When does this patent expire?

This patent has expired and is now in the public domain — anyone can use the invention freely.

### What is patent US 1721530 cited by?

This patent has been cited by 2 later patents that build on its ideas.

### What problem does this patent solve?

Jacob Schick's invention fundamentally changed personal grooming by introducing the concept of the replaceable blade magazine. This design reduced the risk of cuts and made blade replacement a quick, sanitary process, laying the foundation for the Schick brand's long-term dominance in the shaving market.

### What does this patent NOT cover?

Does not cover standard double-edge safety razors that require manual blade assembly.

**Full plain-English explainer:** https://patentbrief.org/patent/us/1721530/schick-repeating-razor

**Original patent:** https://patents.google.com/patent/US1721530

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_Source: PatentBrief — https://patentbrief.org. Patent facts are from public records; the plain-English explanation is PatentBrief's._


## Related patents

Semantically similar inventions in the PatentBrief corpus:

- [How King Gillette Invented the Modern Disposable Safety Razor](https://patentbrief.org/patent/us/775134/safety-razor-gillette) — King Gillette's 1904 patent for a safety razor with a thin, replaceable, double-edged blade that changed how the world shaves.
- [How the First Cotton Swabs Were Mass-Produced](https://patentbrief.org/patent/us/1721815/q-tip-cotton-swab) — Leo Gerstenzang's 1929 patent for the automated manufacturing of cotton-tipped applicators, the invention that created the modern Q-Tip.
- [How Laszlo Biro Invented the Modern Ballpoint Pen](https://patentbrief.org/patent/us/2390636/ballpoint-pen-biro) — This 1945 patent describes the original ballpoint pen mechanism that uses a rotating sphere to distribute thick, quick-drying ink onto paper.
- [How Gideon Sundback Invented the Modern Zipper](https://patentbrief.org/patent/us/1219881/zipper-separable-fastener) — The 1917 patent for the separable fastener that perfected the design of the modern zipper using interlocking teeth on two flexible tapes.
- [How Modern Rollerblades Became Adjustable and Interchangeable](https://patentbrief.org/patent/us/4492385/inline-skates-rollerblade-olson) — A 1982 patent describing a skate design that allows users to swap between wheels and blades and adjust their position on the boot for better performance.