Molly Ayala
The standard electric light bulb is a relatively new invention, with Thomas Edison often credited as its inventor. However, several inventors contributed to its development over many years. The first constant electric light was demonstrated in 1835, and for the next 40 years, scientists worldwide worked on improving the incandescent lamp. Edison's researchers, such as Lewis Latimer, also contributed to the invention of the light bulb. Edison himself patented the incandescent light bulb in 1879 and again in 1880, paving the way for the universal domestic use of electric light.
| Characteristics | Values |
|---|---|
| Inventor | Thomas Edison |
| Patent Date | 27 January 1880 |
| Patent Number | 223,898 |
| Patent Description | An improvement in electric lamps, using a "carbon filament or strip coiled and connected to platina contact wires" |
| Patent History | Purchased Woodward and Evans' patent; sued by Joseph Swan for patent infringement; patent invalidated in 1883 due to similarities with William E. Sawyer's work; patent reinstated in 1885 |
| Other Inventors | Humphry Davy, Warren de la Rue, Joseph Swan, Lewis Howard Latimer, Willis R. Whitney, William David Coolidge |
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What You'll Learn
Thomas Edison's 1880 patent
Thomas Edison is often credited as the inventor of the lightbulb. However, it is important to note that he built upon the work of previous inventors. On January 27, 1880, Edison received a patent for his "electric lamp", embodying the principles of his incandescent lamp. This patent paved the way for the universal domestic use of electric light.
Edison's 1880 patent was an improvement on existing electric lamps, rather than a wholly new invention. However, the design changes he implemented, such as the use of a carbon filament, made his lamp reliable, safe, and practical. This propelled the United States out of the gaslight era and into the electric age.
The journey towards the creation of the lightbulb began years before 1880. In 1878, Edison assembled a team of scientists and technicians to work on the challenge of creating an effective and affordable electric lamp. With determination, Edison and his team tested thousands of theories and designs. This led to the creation of a commercially viable electric light bulb on October 21, 1879.
In the early 1880s, Edison faced competition from companies installing alternating current (AC) systems for street and large-space lighting. However, his patented low-voltage direct current (DC) incandescent lamp system was designed to supply lighting for streets, small businesses, and domestic customers. During the 1880s, Edison also patented a system for electricity distribution, establishing the first investor-owned electric utility.
While Edison is often celebrated as the inventor of the lightbulb, it is worth acknowledging the contributions of other inventors, such as Lewis Latimer, who worked with Edison and patented a more efficient way of manufacturing carbon filaments in 1882, and Joseph Swan, who held a British patent for a similar incandescent electric lamp in 1880.
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Lewis Latimer's 1881 patent
Lewis Howard Latimer, born on September 4, 1848, in Chelsea, Massachusetts, was an American inventor and patent draftsman. He is known for his 1881 patent for the electric lamp, which he received on September 13, 1881, along with Joseph V. Nichols. This patent covered a method of attaching carbon filaments to conducting wires within an electric lamp.
Latimer's 1881 patent was a significant contribution to the development of the electric light bulb. At that time, Thomas Edison had already patented his light bulb, which used a carbonized bamboo filament that burned out quickly. Latimer's patent addressed this issue by creating a more durable carbon filament. He achieved this by encasing the filament in cardboard, which reduced breakages during the production process.
Latimer's work on carbon filaments was not limited to his 1881 patent. In 1882, he received another patent for the "process of manufacturing carbons," further refining the production of carbon filaments for light bulbs. This process involved wrapping the filaments in a cardboard envelope, making the manufacturing process more efficient and cost-effective.
Latimer's expertise in drafting and patents, combined with his knowledge of electric lighting, led to him joining the Edison Electric Light Company in 1884. He worked as a draftsman and expert witness in patent litigation on electric lights. During his time at Edison, Latimer wrote the first book on electric lighting, titled "Incandescent Electric Lighting," published in 1890. He also supervised the installation of public electric lights in major cities, including New York, Philadelphia, Montreal, and London.
Latimer's contributions to the electric light bulb and his work with the Edison Electric Light Company played a significant role in making electric lighting practical and affordable for public use. His innovations in carbon filament manufacturing were key steps in the evolution of the light bulb, making it more durable, efficient, and accessible to the general public.
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The 1840 British prototype
Although Thomas Edison is often credited as the inventor of the lightbulb, several inventors contributed to the development of this revolutionary technology before him. One such inventor was British scientist Warren de la Rue, who, in 1840, developed an efficient lightbulb design using a coiled platinum filament instead of copper. However, the high cost of platinum prevented the widespread commercialisation of this prototype.
De la Rue's prototype built on the work of earlier inventors. In 1835, the first constant electric light was demonstrated, and over the next 40 years, scientists around the world worked on improving the design of the incandescent lamp. These early bulbs had extremely short lifespans, were too expensive to produce, and consumed too much energy.
De la Rue's 1840 prototype addressed some of these issues by utilising a platinum filament, which offered improved efficiency over copper filaments. Platinum has a higher melting point and lower electrical resistance than copper, making it a more suitable material for light bulb filaments. By using a coiled platinum filament, de la Rue's prototype likely achieved a brighter light output and longer lifespan compared to contemporary copper-filament bulbs.
However, the high cost of platinum limited the commercial viability of de la Rue's design. At the time, the materials and manufacturing processes required for producing light bulbs were expensive, and de la Rue's use of platinum further increased the cost, preventing its widespread adoption.
Despite this setback, de la Rue's prototype represented a significant step forward in the development of the electric light bulb. It inspired subsequent inventors, such as Joseph Swan and Thomas Edison, to experiment with different filament materials and designs, gradually improving the efficiency and longevity of the light bulb. De la Rue's work exemplifies the iterative nature of innovation, where each advancement builds upon the ideas and discoveries of previous inventors, gradually leading to the creation of the modern light bulbs we use today.
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The 1875 Woodward-Evans patent
Woodward and Evans' patent described a process for obtaining artificial light using electricity. They employed a gas engine or other power source to rotate a magneto-electric machine, generating enough electricity to heat carbon to incandescence. The carbon was placed in a lamp or vessel, and the air was extracted before being filled with rarefied gas. When electricity was supplied, the carbon within the vessel heated up, causing the rarefied gas to become luminous and produce light. This process could be repeated to create multiple lights from a single machine.
The Woodward-Evans light bulb represented an important advancement in the quest for electric lighting. However, the inventors faced challenges in securing investment due to the high production costs of their bulbs. They endured public ridicule and struggled to form a company to support their invention. Despite these setbacks, their early work in Toronto laid the foundation for subsequent innovations in the field of electric lighting.
In 1875, Thomas Edison purchased half of the Woodward-Evans patent, recognising its potential for his own research. He built upon their design to create a longer-lasting bulb, addressing the limitations of early bulbs with short lifespans and high electric current requirements. Edison's improvements to the filament and overall design led to the widespread popularity of his incandescent light bulb in Europe and the United States.
While Edison is often credited as the sole inventor of the light bulb, it is important to acknowledge the contributions of pioneers like Woodward and Evans, whose work played a pivotal role in the evolution of this revolutionary technology.
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The 1880 commercial model
While Thomas Edison is often credited as the inventor of the lightbulb, the process involved several inventors who made small improvements on the ideas of previous inventors.
Thomas Edison first patented his incandescent light bulb in 1879 and again in 1880, before commercializing it. However, British inventors had demonstrated the possibility of electric light with the arc lamp as early as 1835.
Edison and his team of researchers tested thousands of designs for bulbs between 1878 and 1880. They experimented with different filament materials, such as cardboard, grasses, and canes, before settling on bamboo as the best filament. The use of Japanese bamboo as a filament was inspired by Edison's recollection of a bamboo fishing pole he had used while relaxing by a lake in Wyoming.
On January 27, 1880, Edison received U.S. patent number 223,898 for his electric lamp. The patent described several ways of creating the carbon filament, including the use of "cotton and linen thread, wood splints, papers coiled in various ways." Edison's design changes and choice of materials, such as a carbon filament, made his lamp reliable, safe, and practical for universal domestic use.
In 1882, Edison demonstrated the distribution of electricity through a series of wires and tubes, known as conduits, with the Holborn Viaduct in London. He also developed the first commercial power utility, called the Pearl Street Station in lower Manhattan, and invented the first electric meter to track electricity usage.
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Frequently asked questions
Thomas Edison patented the standard electric light bulb in 1880.
No, Thomas Edison was not the first person to invent an electric light bulb. In fact, the light bulb was invented 71 years before Edison patented his version. British scientist Warren de la Rue, for example, developed an electric light bulb using a coiled platinum filament in 1840.
Edison's light bulb was the first real commercial model. It had a lamp life of 600 hours and was inexpensive.
Edison was one of the most prolific inventors of all time, with 1,093 patented inventions and innovations. Some of his most famous inventions include the phonograph, the moving picture camera, and improvements to the telephone.
