How Thomas Edison Improved Early Phonograph Recording
An 1878 patent by Thomas Edison detailing mechanical improvements to early sound recording devices to make them more reliable.
Original patent title: “Improvement in phonograph or speaking machines”
An 1878 patent by Thomas Edison detailing mechanical improvements to early sound recording devices to make them more reliable. Granted to Thomas A. Edison in 1878 with 9 forward citations.
Key facts
Coverage
What does this patent actually cover?
This patent describes mechanical refinements to the phonograph, which was the first device capable of both recording and reproducing sound. It focuses on the physical interaction between the recording needle and the storage medium, typically a tinfoil-wrapped cylinder. By adjusting the pressure and alignment of the diaphragm and stylus, the mechanism ensures a more consistent groove depth during the recording process. This allows for clearer playback by minimizing mechanical distortion caused by uneven tracking.
The gap
What does this patent NOT cover?
- Does not cover electronic amplification or vacuum tube technology.
- Does not cover magnetic tape or digital audio storage methods.
- Does not cover the use of flat discs instead of cylindrical recording media.
- Does not cover wireless transmission of audio signals.
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
What made this novel
The innovation lies in the precision of the mechanical feedback loop between the sound-sensitive diaphragm and the cutting stylus, which was the first time someone successfully stabilized the physical translation of sound waves into a permanent material medium.
The Patent Drawing
Schematic visualization of the patent's claim structure. Hand-drawn diagrams in progress for each landmark patent.
Where you've seen this
Real-world examples
Edison's original tinfoil phonograph
Early wax cylinder dictation machines
Why it matters
The bigger picture
This patent represents one of the foundational steps in the history of consumer audio technology. It helped transition the phonograph from a laboratory curiosity into a practical machine that could be sold to the public, setting the stage for the entire recorded music industry.
Granted
February 19, 1878
Market context
Who's building on this
Companies in this space
Modern companies like Sony and various high-end analog audio manufacturers continue to build on the legacy of physical sound reproduction. However, the specific mechanical techniques in this patent are now historical artifacts rather than active industry standards.
Market impact
This patent helped establish the phonograph as a viable product category, eventually leading to the massive global market for recorded music. It provided the technical proof-of-concept that sound could be captured and sold, which fundamentally changed how humanity consumes art and information.
Claim 1 — Plain English
What this patent covers
This patent describes mechanical refinements to the phonograph, which was the first device capable of both recording and reproducing sound. It focuses on the physical interaction between the recording needle and the storage medium, typically a tinfoil-wrapped cylinder. By adjusting the pressure and alignment of the diaphragm and stylus, the mechanism ensures a more consistent groove depth during the recording process. This allows for clearer playback by minimizing mechanical distortion caused by uneven tracking.
The clever bit
The innovation lies in the precision of the mechanical feedback loop between the sound-sensitive diaphragm and the cutting stylus, which was the first time someone successfully stabilized the physical translation of sound waves into a permanent material medium.
What it does not cover
- Does not cover electronic amplification or vacuum tube technology.
- Does not cover magnetic tape or digital audio storage methods.
- Does not cover the use of flat discs instead of cylindrical recording media.
- Does not cover wireless transmission of audio signals.
PatentBrief Score
Impact Score
Early stage
Citation count
20/40
Early citations
Claim breadth
0/20
Narrow claimsclaimsThe numbered statements at the end of a patent that legally define what the inventor owns.Read more →
Recency
0/20
Older than 20 years
Assignee scale
0/20
Independent or smaller assigneeassigneeThe entity that owns the patent — usually the inventor's employer or a company.Read more →
PatentBrief Impact Score — based on citation count, claim breadth, recency, and assignee scale. Not a legal assessment.
Heuristic Value Estimate
What this patent might be worth
$7K – $23K
Midpoint $14K · expired or expiring · industry ×1.5
Heuristic only — blends forward/backward citation counts, claim scope, time remaining, litigation history, and CPC-derived industry baseline. Real valuations need a professional appraisal.
Concepts involved
Citations
Patent lineage
Cite this patent
(1878). How Thomas Edison Improved Early Phonograph Recording (U.S. Patent No. 200,521). U.S. Patent and Trademark Office. https://patentbrief.org/patent/us/200521/phonograph-edison
Auto-generated from the patent record. Double-check author order and the issue date against the official USPTO document before submitting.
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Common Questions
Frequently Asked Questions
What does How Thomas Edison Improved Early Phonograph Recording cover?
An 1878 patent by Thomas Edison detailing mechanical improvements to early sound recording devices to make them more reliable.
Who owns patent US 200521?
Thomas A. Edison owns this patent, granted in 1878.
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 200521 cited by?
This patent has been cited by 9 later patents that build on its ideas.
What problem does this patent solve?
This patent represents one of the foundational steps in the history of consumer audio technology. It helped transition the phonograph from a laboratory curiosity into a practical machine that could be sold to the public, setting the stage for the entire recorded music industry.
What does this patent NOT cover?
Does not cover electronic amplification or vacuum tube technology.
Same assignee
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