# How the First Modern Kitchen Garbage Disposal Was Invented

> John W. Hammes' 1933 invention of a motorized grinding device that mounts under a kitchen sink to pulverize food waste into small particles for disposal through plumbing.

- **Patent:** US 2012680
- **Original title:** Garbage disposal device
- **Owner:** Individual
- **Granted:** 1935
- **Status:** Public domain (expired)
- **Times cited:** 43
- **Field:** mechanical, consumer_electronics

## What it does

The device consists of a grinding chamber mounted directly beneath a sink drain. It uses a motor to spin a shredding mechanism that forces food scraps against stationary teeth or a grinding ring. This action breaks down solid food waste into a slurry fine enough to pass through standard residential plumbing pipes without causing clogs. The system is designed to be activated by a switch, allowing users to clear food waste immediately after meal preparation.

## What it does NOT cover

- Does not cover non-motorized manual grinding devices.
- Does not cover industrial-scale waste management systems or sewage treatment plants.
- Does not cover composting systems or devices that do not discharge waste into the sewer line.
- Does not cover chemical-based waste breakdown methods.

## The clever bit

The innovation was the integration of a high-speed grinding mechanism within the confined space of a sink drain, specifically calibrated to produce particles small enough to avoid clogging household plumbing.

## Real-world examples

1. InSinkErator residential garbage disposals
2. Standard under-sink food waste grinders

## Why it matters

This patent laid the foundation for the modern residential garbage disposal, a staple appliance in millions of homes. It transformed kitchen hygiene by providing a convenient way to eliminate organic waste before it could decompose in trash bins.

## Frequently asked questions

### What does How the First Modern Kitchen Garbage Disposal Was Invented cover?

John W. Hammes' 1933 invention of a motorized grinding device that mounts under a kitchen sink to pulverize food waste into small particles for disposal through plumbing.

### Who owns patent US 2012680?

Individual owns this patent, granted in 1935.

### 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 2012680 cited by?

This patent has been cited by 43 later patents that build on its ideas.

### What problem does this patent solve?

This patent laid the foundation for the modern residential garbage disposal, a staple appliance in millions of homes. It transformed kitchen hygiene by providing a convenient way to eliminate organic waste before it could decompose in trash bins.

### What does this patent NOT cover?

Does not cover non-motorized manual grinding devices.

**Full plain-English explainer:** https://patentbrief.org/patent/us/2012680/garbage-disposal-hammes

**Original patent:** https://patents.google.com/patent/US2012680

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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:

- [Josephine Cochrane's Mechanical Dishwashing Machine](https://patentbrief.org/patent/us/355139/dishwasher-cochrane) — A late 19th-century invention that used a pressurized water pump and a rotating rack to clean dishes mechanically, moving away from manual scrubbing.
- [How the Modern Kitchen Blender Works](https://patentbrief.org/patent/us/1480914/blender-beverage-mixer-poplawski) — Stephen Poplawski's 1922 invention of the electric beverage mixer, which introduced the rotating blade at the base of a container to liquefy ingredients.
- [How Early Industrial Food Mixers Used Planetary Gear Systems](https://patentbrief.org/patent/us/1264128/stand-mixer-kitchenaid-johnston) — A 1918 patent for a heavy-duty industrial mixing machine that used a specific gear arrangement to rotate a beater while simultaneously moving it around the bowl.
- [How the 1940 Nachumsohn Cooking Apparatus Works](https://patentbrief.org/patent/us/2187888/crock-pot-slow-cooker-naxon) — A 1940 patent for a cooking device designed to heat food efficiently using an enclosed chamber and specific heat distribution methods.
- [How Jacob Schick Invented the Modern Magazine-Loading Safety Razor](https://patentbrief.org/patent/us/1721530/schick-repeating-razor) — A 1929 patent for a safety razor that uses a replaceable blade magazine, allowing users to change blades without touching the sharp edges.