# How Elias Howe Invented the Modern Lockstitch Sewing Machine

> Elias Howe's 1846 patent for the lockstitch sewing machine, which used two separate threads to create a durable stitch that revolutionized garment manufacturing.

- **Patent:** US 4750
- **Original title:** Improvement in sewing-machines
- **Owner:** Elias Howe
- **Granted:** 1846
- **Status:** Active
- **Times cited:** 2
- **Field:** mechanical, consumer_electronics

## What it does

The invention uses a needle with an eye at the point and a shuttle that carries a second thread. As the needle passes through the fabric, it creates a loop of thread. The shuttle then passes through this loop, locking the two threads together to form a secure stitch that does not unravel easily. This mechanism allows for rapid, automated sewing compared to traditional hand-stitching.

## What it does NOT cover

- Does not cover chain-stitch machines which use only a single thread.
- Does not cover electric motors, as this was a purely mechanical invention.
- Does not cover the concept of a needle itself, only the specific eye-pointed needle configuration used with a shuttle.

## The clever bit

By moving the eye of the needle to the point rather than the base, Howe allowed the needle to carry the thread through the fabric and create a loop for the shuttle to catch in one continuous motion.

## Real-world examples

1. Industrial sewing machines
2. Domestic sewing machines
3. Mass-produced apparel manufacturing

## Why it matters

This patent is the foundation of the modern garment industry. It shifted sewing from a slow, manual domestic task to an industrial process, enabling the mass production of clothing and significantly lowering the cost of apparel.

## Frequently asked questions

### What does How Elias Howe Invented the Modern Lockstitch Sewing Machine cover?

Elias Howe's 1846 patent for the lockstitch sewing machine, which used two separate threads to create a durable stitch that revolutionized garment manufacturing.

### Who owns patent US 4750?

Elias Howe owns this patent, granted in 1846.

### 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 4750 cited by?

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

### What problem does this patent solve?

This patent is the foundation of the modern garment industry. It shifted sewing from a slow, manual domestic task to an industrial process, enabling the mass production of clothing and significantly lowering the cost of apparel.

### What does this patent NOT cover?

Does not cover chain-stitch machines which use only a single thread.

**Full plain-English explainer:** https://patentbrief.org/patent/us/4750/sewing-machine-howe

**Original patent:** https://patents.google.com/patent/US4750

---

_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 Levi Strauss Invented the Copper-Riveted Jean Pocket](https://patentbrief.org/patent/us/139121/blue-jeans-riveted-levi-strauss) — This 1873 patent describes the use of metal rivets to reinforce the corners of pockets on work pants, preventing them from ripping under heavy use.
- [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 Joseph Glidden Invented Modern Barbed Wire](https://patentbrief.org/patent/us/157124/barbed-wire-glidden) — A 1874 patent for a specific wire-fence design that used twisted strands to hold sharp barbs in place, fundamentally changing how the American West was fenced.
- [How Walter Hunt Invented the Modern Safety Pin](https://patentbrief.org/patent/us/6281/safety-pin-hunt) — Walter Hunt's 1849 patent for a simple, coiled wire device that keeps sharp points covered while fastening fabric.
- [How Thomas Edison Improved Early Phonograph Recording](https://patentbrief.org/patent/us/200521/phonograph-edison) — An 1878 patent by Thomas Edison detailing mechanical improvements to early sound recording devices to make them more reliable.