How Gwyn & Campbell ousted the original inventor — the Civil War patent heist

Published on March 2, 2026
Duration: 1:06

This entry details the historical context of the Gwyn & Campbell Cosmopolitan Carbine, focusing on the patent dispute and design simplification. It highlights how Edward Gwyn and Campbell circumvented Henry Gross's original patent by modifying the carbine's action, leading to a new patent and production under their own names. The simplification is noted as a positive development.

Quick Summary

The Gwyn & Campbell Carbine was a firearm developed by Edward Gwyn and Campbell. They simplified the action of an earlier carbine designed by Henry Gross, patented their version in 1862, and produced it to avoid paying royalties to Gross, manufacturing it in Hamilton, Ohio.

Chapters

  1. 00:00Cosmopolitan Arms Factory & Carbine
  2. 00:20Edward Gwyn Patent Circumvention
  3. 00:49Gwyn & Campbell Production Shift
  4. 01:02Simplification Benefits

Frequently Asked Questions

What was the Gwyn & Campbell Carbine?

The Gwyn & Campbell Carbine was a firearm developed by Edward Gwyn and Campbell. They simplified the action of an earlier carbine designed by Henry Gross, patented their version, and produced it to avoid paying royalties to Gross.

What was the patent dispute involving the Cosmopolitan Carbine?

Edward Gwyn and Campbell modified the original Cosmopolitan Carbine design by Henry Gross. They patented their simplified action in 1862, allowing them to produce the firearm under their own patent and avoid paying royalties to the original inventor, Henry Gross.

Where was the Gwyn & Campbell Carbine manufactured?

The Gwyn & Campbell Carbine was manufactured in Hamilton, Ohio. This location is noted in historical records related to the Cosmopolitan Arms Factory and the patent filings of Gwyn and Campbell.

Why did Gwyn and Campbell simplify the carbine's action?

Gwyn and Campbell simplified the carbine's action primarily to circumvent the patent held by the original inventor, Henry Gross. By creating a new, simplified design that was covered by their own patent, they could produce and sell the firearm without owing royalties.

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