# How the 1940 Nachumsohn Cooking Apparatus Works

> A 1940 patent for a cooking device designed to heat food efficiently using an enclosed chamber and specific heat distribution methods.

- **Patent:** US 2187888
- **Original title:** Cooking apparatus
- **Owner:** Individual
- **Granted:** 1940
- **Status:** Public domain (expired)
- **Times cited:** 31
- **Field:** mechanical, consumer_electronics

## What it does

The patent describes a cooking apparatus featuring a specialized chamber designed to contain food while applying heat from a controlled source. It focuses on the structural arrangement of the heating elements relative to the food container to ensure uniform temperature distribution. By managing the airflow and heat retention within the housing, the device aims to cook items more consistently than open-flame methods available at the time.

## What it does NOT cover

- Does not cover modern induction heating technology.
- Does not cover digital temperature control or programmable timers.
- Does not cover microwave-based cooking mechanisms.
- Does not cover convection fans or forced-air circulation systems.

## The clever bit

The invention cleverly uses the physical geometry of the enclosure to trap heat, effectively turning a simple heating element into a more efficient, self-contained cooking environment.

## Real-world examples

1. Early electric roaster ovens
2. Vintage countertop heating appliances

## Why it matters

This patent represents the era of mid-century kitchen innovation where inventors sought to move away from simple stoves toward specialized, enclosed cooking appliances. It highlights the transition toward more sophisticated thermal management in home appliances, laying early groundwork for the design of modern countertop ovens.

## Frequently asked questions

### What does How the 1940 Nachumsohn Cooking Apparatus Works cover?

A 1940 patent for a cooking device designed to heat food efficiently using an enclosed chamber and specific heat distribution methods.

### Who owns patent US 2187888?

Individual owns this patent, granted in 1940.

### 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 2187888 cited by?

This patent has been cited by 31 later patents that build on its ideas.

### What problem does this patent solve?

This patent represents the era of mid-century kitchen innovation where inventors sought to move away from simple stoves toward specialized, enclosed cooking appliances. It highlights the transition toward more sophisticated thermal management in home appliances, laying early groundwork for the design of modern countertop ovens.

### What does this patent NOT cover?

Does not cover modern induction heating technology.

**Full plain-English explainer:** https://patentbrief.org/patent/us/2187888/crock-pot-slow-cooker-naxon

**Original patent:** https://patents.google.com/patent/US2187888

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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 the First Automatic Pop-Up Toaster Works](https://patentbrief.org/patent/us/1394450/pop-up-toaster-strite) — Charles Strite's 1921 patent for the first toaster that automatically pops bread up after a set time, preventing it from burning.
- [How Percy Spencer Invented the Microwave Oven](https://patentbrief.org/patent/us/2495429/microwave-oven-cooking) — This 1945 patent describes the process of using concentrated microwave energy to cook food, the fundamental technology behind the modern microwave oven.
- [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 Clarence Birdseye Invented Modern Frozen Food](https://patentbrief.org/patent/us/1773079/frozen-food-birdseye) — This 1930 patent describes the process of rapidly freezing food in small packages to prevent the formation of large ice crystals that ruin texture and flavor.
- [How Cup Noodles Are Designed to Cook Perfectly](https://patentbrief.org/patent/us/3997676/cup-noodles-instant-ramen-ando) — A 1976 patent describing the specific shape, density, and placement of dehydrated noodles inside a cup to ensure they cook evenly and quickly when hot water is added.