When did Thomas Edison invent the light bulb?

Answer 1

Humphrey Davy invented the light bulb in 1809, but it was not practical.

It is a matter of documented record that Swan obtained a UK patent covering a partial vacuum, carbon filament incandescent lamp in 1860.

Thomas Alva Edison patented his invention in December, 1879, almost 20 years later, the same year that Swan's bulbs were in domestic use in Britain.
Edison did not invent the first electric light bulb, but instead invented the first commercially practical incandescent light. He therefore just improved on other peoples work in 1879.
1879

Thomas Edison's greatest challenge was the development of a practical incandescent, electric light. Contrary to popular belief, he didn't "invent" the lightbulb, but rather he improved upon a 50-year-old idea. In 1879, using lower current electricity, a small carbonized filament, and an improved vacuum inside the globe, he was able to produce a reliable, long-lasting source of light. So he said. Tesla worked for Thomas Alva Edison for 1 year At that time, the most important "inventor" in the world was named Thomas Alva Edison-the so-called wizard of Menlo Park.... Edison was credited with the invention of the DC dynamo and the electric light bulb . . . but the only thing he really invented was the ELECTRIC CHAIR!!
1879
Thomas Edison invented the incandescent light bulb in the year 1879

Many other people had developed working light bulbs of various kinds before Edison.

A British inventor by the name of Joseph Swan received a patent for an identical bulb 1 year earlier than Edison.

Nikola Tesla actually had working light bulbs in his laboratory before Edison did, too. These bulbs were fluorescent, not incandescent. These are early versions of the compact fluorescent bulbs that we know today.

Answer 2

Humphrey Davy invented the light bulb in 1809, but it was not practical.

It is a matter of documented record that Swan obtained a UK patent covering a partial vacuum, carbon filament incandescent lamp in 1860.

Thomas Alva Edison patented his invention in December, 1879, almost 20 years later, the same year that Swan's bulbs were in domestic use in Britain.
Edison did not invent the first electric light bulb, but instead invented the first commercially practical incandescent light. He therefore just improved on other peoples work in 1879.
1879

Thomas Edison's greatest challenge was the development of a practical incandescent, electric light. Contrary to popular belief, he didn't "invent" the lightbulb, but rather he improved upon a 50-year-old idea. In 1879, using lower current electricity, a small carbonized filament, and an improved vacuum inside the globe, he was able to produce a reliable, long-lasting source of light. So he said. Tesla worked for Thomas Alva Edison for 1 year At that time, the most important "inventor" in the world was named Thomas Alva Edison-the so-called wizard of Menlo Park.... Edison was credited with the invention of the DC dynamo and the electric light bulb . . . but the only thing he really invented was the ELECTRIC CHAIR!!
1879
Thomas Edison invented the incandescent light bulb in the year 1879

Many other people had developed working light bulbs of various kinds before Edison.

A British inventor by the name of Joseph Swan received a patent for an identical bulb 1 year earlier than Edison.

Nikola Tesla actually had working light bulbs in his laboratory before Edison did, too. These bulbs were fluorescent, not incandescent. These are early versions of the compact fluorescent bulbs that we know today.