# How the First Coin-Operated Parking Meter Works

> Carl Magee's 1935 invention of the mechanical parking meter, which introduced the concept of paying for temporary street parking using a coin-activated timer.

- **Patent:** US 2118318
- **Original title:** Coin controlled parking meter
- **Owner:** DUAL PARKING METER Co
- **Granted:** 1938
- **Status:** Public domain (expired)
- **Times cited:** 15
- **Field:** mechanical, automotive

## What it does

The device functions as a mechanical timer housed in a weather-resistant casing. When a user inserts a coin, it engages a gear mechanism that physically rotates a dial or pointer to show the remaining time. As time passes, the internal clockwork mechanism slowly moves the pointer back to zero, at which point the parking time expires. This provided a way for cities to regulate curb space by physically limiting how long a vehicle could occupy a specific spot.

## What it does NOT cover

- Does not cover electronic or digital payment systems like credit card readers or mobile apps.
- Does not cover networked systems that communicate with a central server to track occupancy.
- Does not cover sensors that detect the presence of a vehicle to start or stop the timer automatically.

## The clever bit

The innovation was not just the timer, but the integration of a coin-actuated trigger that forced the user to perform a physical action to initiate a time-limited state, solving the problem of 'parking hogs' in downtown areas.

## Real-world examples

1. Original mechanical parking meters in Oklahoma City
2. Vintage coin-operated parking meters found in historical districts

## Why it matters

This patent effectively created the modern urban parking industry. By turning curb space into a revenue-generating asset, it allowed cities to manage traffic flow and turnover in busy commercial districts, fundamentally changing how city streets are organized.

## Frequently asked questions

### What does How the First Coin-Operated Parking Meter Works cover?

Carl Magee's 1935 invention of the mechanical parking meter, which introduced the concept of paying for temporary street parking using a coin-activated timer.

### Who owns patent US 2118318?

DUAL PARKING METER Co owns this patent, granted in 1938.

### 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 2118318 cited by?

This patent has been cited by 15 later patents that build on its ideas.

### What problem does this patent solve?

This patent effectively created the modern urban parking industry. By turning curb space into a revenue-generating asset, it allowed cities to manage traffic flow and turnover in busy commercial districts, fundamentally changing how city streets are organized.

### What does this patent NOT cover?

Does not cover electronic or digital payment systems like credit card readers or mobile apps.

**Full plain-English explainer:** https://patentbrief.org/patent/us/2118318/parking-meter-magee

**Original patent:** https://patents.google.com/patent/US2118318

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


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