How Early Cochlear Implants Used Digital Signals to Restore Hearing
A 1977 patent describing an electronic device that converts sound into digital pulses to stimulate the auditory nerve, bypassing a damaged inner ear.
Original patent title: “Implantable electronic hearing aid”
A 1977 patent describing an electronic device that converts sound into digital pulses to stimulate the auditory nerve, bypassing a damaged inner ear. Granted to Individual in 1977 with 8 claims and 55 forward citations, and it is now in the public domain.
Key facts
Coverage
What does this patent actually cover?
The device captures external sound using a microphone and converts it into an analog electrical signal. This signal is then split into different frequency bands using a series of filters, mimicking how a healthy cochlea processes sound. Each band is converted into a digital pulse signal, which is sent through implanted electrodes directly to the auditory nerve. This allows the brain to receive electrical impulses that represent specific sound frequencies, enabling individuals with non-functioning inner ears to perceive sound.
The gap
What does this patent NOT cover?
- Does not cover non-implantable hearing aids that rely on acoustic amplification.
- Does not cover signal processing methods that do not use frequency-specific filter networks.
- Does not cover wireless or transcutaneous induction-based signal transmission methods.
- Does not cover software-based speech recognition or AI-driven sound enhancement algorithms.
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
What made this novel
The innovation was in the use of frequency-specific filter networks to map different parts of the audio spectrum to specific locations on the auditory nerve, simulating the natural tonotopic organization of the human cochlea.
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
Modern multi-channel cochlear implants
Auditory brainstem implants
Why it matters
The bigger picture
This patent represents a foundational step in the development of the modern cochlear implant. By moving beyond simple electrical stimulation to a frequency-filtered, multi-channel approach, it provided a technical roadmap for restoring hearing to those for whom traditional hearing aids were ineffective. It remains a landmark in neuro-prosthetics.
Filed
March 16, 1977
Granted
December 13, 1977
Market context
Who's building on this
Companies in this space
Major medical device manufacturers such as Cochlear Limited, Advanced Bionics, and MED-EL have built upon the principles of multi-channel electrical stimulation defined here. These companies continue to refine the signal processing and electrode array designs first envisioned in this era.
Market impact
This patent helped define the architecture for the cochlear implant industry, which has since restored hearing to hundreds of thousands of people worldwide. It moved the field from experimental, single-channel stimulation to the multi-channel systems that are now the clinical standard for treating severe-to-profound sensorineural hearing loss.
Claim 1 — Plain English
What this patent covers
The device captures external sound using a microphone and converts it into an analog electrical signal. This signal is then split into different frequency bands using a series of filters, mimicking how a healthy cochlea processes sound. Each band is converted into a digital pulse signal, which is sent through implanted electrodes directly to the auditory nerve. This allows the brain to receive electrical impulses that represent specific sound frequencies, enabling individuals with non-functioning inner ears to perceive sound.
The clever bit
The innovation was in the use of frequency-specific filter networks to map different parts of the audio spectrum to specific locations on the auditory nerve, simulating the natural tonotopic organization of the human cochlea.
What it does not cover
- Does not cover non-implantable hearing aids that rely on acoustic amplification.
- Does not cover signal processing methods that do not use frequency-specific filter networks.
- Does not cover wireless or transcutaneous induction-based signal transmission methods.
- Does not cover software-based speech recognition or AI-driven sound enhancement algorithms.
Patent Journey
From filing to expiry
PatentBrief Score
Impact Score
Moderate
Citation count
35/40
Highly cited
Claim breadth
5/20
Moderate scope
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
$50K – $158K
Midpoint $99K · expired or expiring · industry ×2.2
Heuristic only — blends forward/backward citation counts, claim scope, time remaining, litigation history, and CPC-derived industry baseline. Real valuations need a professional appraisal.
The original legal language
Original claims
8 claims as filed with the patent office.
Concepts involved
Citations
Patent lineage
Cite this patent
Jr., A. M. K. (1977). How Early Cochlear Implants Used Digital Signals to Restore Hearing (U.S. Patent No. 4,063,048). U.S. Patent and Trademark Office. https://patentbrief.org/patent/us/4063048/cochlear-implant-hearing
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 Early Cochlear Implants Used Digital Signals to Restore Hearing cover?
A 1977 patent describing an electronic device that converts sound into digital pulses to stimulate the auditory nerve, bypassing a damaged inner ear.
Who owns patent US 4063048?
Individual owns this patent, granted in 1977.
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 4063048 cited by?
This patent has been cited by 55 later patents that build on its ideas.
What problem does this patent solve?
This patent represents a foundational step in the development of the modern cochlear implant. By moving beyond simple electrical stimulation to a frequency-filtered, multi-channel approach, it provided a technical roadmap for restoring hearing to those for whom traditional hearing aids were ineffective. It remains a landmark in neuro-prosthetics.
What does this patent NOT cover?
Does not cover non-implantable hearing aids that rely on acoustic amplification.
Same assignee
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