Patent US3267931

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Patent US3,267,931 — Electrically Stimulated Hearing with Signal Feedback — is a United States patent filed on January 9, 1963, by Henry K. Puharich and Joseph L. Lawrence, and granted by the US Patent Office on August 23, 1966. The patent describes a system for stimulating hearing in human subjects by applying audio-modulated electrical signals to the facial nerve system via high-impedance capacitive coupling, with the central innovation being a closed-loop feedback circuit that dramatically improves signal clarity, frequency range, and efficiency. It is the third in a sequence of auditory stimulation patents by Puharich, and is considered a foundational document in the research lineage surrounding Voice to Skull technology and non-acoustic neural audio delivery. The full document is available at File:US3267931-Puharich-Electrically-Stimulated-Hearing-Signal-Feedback.pdf.


Patent Details

Field Detail
Patent Number US 3,267,931
Title Electrically Stimulated Hearing with Signal Feedback
Inventors Henry K. Puharich, 87 Hawkes Ave., Ossining, NY; Joseph L. Lawrence, 570 Fort Washington Ave., New York, NY
Filing Date January 9, 1963 (Serial No. 250,301)
Grant Date August 23, 1966
Classification Cl. 128
Prior Art References US 2,995,633; US 3,156,787; US 3,170,993
Parent Application Continuation-in-part of Serial No. 164,882, filed January 8, 1962, issued as US Patent 3,170,993

The full patent document can be accessed here:

Background and Prior Art

This patent builds directly on Puharich's earlier foundational work, in particular US Patent 2,995,633 (Means for Aiding Hearing), which first established the principle that audio-modulated electrical signals could be delivered to the human auditory system via the facial nerve network — a pathway Puharich termed the dormant facial hearing system. That earlier patent demonstrated that signals could be introduced through viable nerves serving the teeth, producing perceived sound without engaging the outer or middle ear.

The intermediate patent, US 3,156,787, furthered the materials science of the coupling interface, refining the dielectric and electrode configurations. US 3,267,931 completes the sequence by introducing a signal feedback loop — the missing ingredient that transformed the concept from a laboratory curiosity into a system capable of reliable, high-fidelity audio delivery.

Henry K. Puharich was a physician and inventor with documented connections to US intelligence programmes. His work on non-acoustic hearing forms a thread running through several areas discussed in BOOK 3: The Radiohead Protocol, including the hypothesis that covert neural audio delivery systems were developed in parallel with, or as part of, classified MK-Ultra-era research. The Voice to Skull page provides broader context for the development of this technology class.

The Facial Nerve System as Auditory Pathway

The core anatomical and technical claim of the patent is that hearing can be electrically stimulated by targeting the trigeminal (V), facial (VII), and cervical nerves serving the neck, face, and scalp — completely bypassing the outer ear, eardrum, and middle ear ossicles. Puharich referred to this network collectively as the dormant facial hearing system, suggesting it represents a latent sensory pathway that can be activated under the right electrical conditions.

The patent specifies that electrode coupling is applied to areas innervated by the trigeminal, facial and cervical nerves, covering the neck, face, and scalp. In the intra-oral implementation, coupling is made directly to free nerve endings serving selected teeth via dental caps.

This anatomical framing is significant for several reasons:

  • It identifies a pathway entirely separate from the cochlear route exploited by conventional hearing aids and cochlear implants.
  • It implies that the system is in principle undetectable from the outside — no visible ear device is required.
  • It creates a delivery pathway compatible with implanted or remotely transmitted signal sources.

This approach bears a conceptual relationship to the Microwave Auditory Effect — the phenomenon in which pulsed microwave radiation induces perceived sound inside the skull — though the mechanisms differ. Both bypass the outer ear entirely. Researchers in the field of Neuroweapons have noted that multiple technical pathways converge on the same outcome: sound perceived internally without external acoustic stimulus.

Cross-section diagram of dental nerve anatomy, relevant to the patent's intra-oral coupling mechanism

The Feedback Innovation

The central engineering contribution of this patent is the addition of a closed-loop capacitive feedback circuit coupling the body of the subject back to the input stage of the amplification chain. The before-and-after contrast documented in the patent is substantial.

Without Feedback

Prior to the feedback innovation, electrically stimulated hearing via the facial nerve system exhibited significant limitations:

  • Distortion: speech reproduction was characterised by marked harmonic distortion, rendering voice signals difficult to understand.
  • Poor speech discrimination: test subjects scored well below 100% on standard speech discrimination tests.
  • Limited frequency range: effective stimulation was achievable only up to approximately 10,000 cycles per second (Hz), cutting off the upper half of the audible spectrum.
  • High power requirement: delivering intelligible signals required comparatively high power levels, raising safety and practicality concerns.

With Feedback

When the feedback loop was introduced — coupling the subject's body back to the preamplifier input stage via a conductive plate — the following effects were observed and documented:

  • Voltage amplification: output terminal voltage increased from the amplifier's rated 400 volts peak-to-peak up to between 900 and 10,000 volts RMS, depending on the degree of coupling established.
  • Elimination of distortion: speech reproduction became clean and undistorted.
  • Improved speech discrimination: scores on standardised tests rose significantly, reaching 100% speech discrimination at optimal coupling.
  • Extended frequency range: intelligible stimulation extended to 20,000 cycles per second — the upper boundary of normal human hearing — and the patent notes the potential for extension beyond this.
  • Self-tuning behaviour: the system became dynamically responsive to the subject's proximity to the feedback coupling plate, automatically adjusting signal characteristics.

The tuning phenomenon is one of the more unusual observations documented. Subjects found they could vary the perceived volume and clarity of the received audio by adjusting their body's proximity to the conductive feedback plate. At an optimal proximity point, both maximum volume and 100% speech discrimination were simultaneously achievable. The patent authors explicitly noted that this feedback phenomenon was "not fully understood" — an unusual admission in a patent document, and one that researchers have highlighted as indicative of the empirical, exploratory character of this line of research.

System Architecture

The patent documents two distinct implementations of the feedback-enhanced facial nerve hearing system.

Laboratory / Studio System (Figure 1)

The bench-level system described in Figure 1 uses commercially available components arranged as follows:

  • Signal source: a Webcor Model 2002 tape recorder, capable of replaying pre-recorded voice, music, or specially prepared waveforms.
  • Amplifier: an Eico Stereo Model ST-70 audio amplifier.
  • Carrier frequency: a 46 kHz high-frequency carrier onto which the audio signal is modulated.
  • Coupling electrode: an insulated plate approximately the size of a penny, covered with 0.25 mil Mylar (polyethylene terephthalate) film. This thin dielectric layer provides the high-impedance capacitive coupling that prevents direct electrical contact with the skin while allowing signal transfer to the underlying nerve pathways.
  • Feedback path: a separate conductive plate (Plate 18 in the patent diagrams) positioned near the subject. The subject's body, in proximity to this plate, establishes a capacitive feedback loop returning signal energy back to the tape recorder's preamplifier stage via variable capacitor C2.

The patent notes that stereophonic sound sensations could be induced by applying electrodes in geometric combinations across different facial nerve areas, suggesting binaural spatial audio was achievable via this method.

Intra-Oral Miniaturised System (Figure 2)

The second implementation is considerably more consequential from the perspective of covert applications:

  • Form factor: designed for concealed use, the receiver system is placed entirely within the oral cavity.
  • Dental coupling: a radio frequency detector and amplifier are coupled to the viable nerves serving selected teeth via cup-shaped gold dental caps lined with dielectric paste — maintaining the high-impedance capacitive coupling principle while conforming to tooth anatomy.
  • Transmission: a short-range radio transmitter carried on or about the subject's body receives audio via a microphone and broadcasts at a carrier frequency of approximately 4 MHz to the intra-oral receiver.
  • Feedback in miniature: feedback coupling is achieved through a second tooth fitted with a denuded gold cap connected to the detector circuit — creating the feedback loop within the oral system.
  • Miniaturisation: the entire intra-oral circuit is described in the patent as "highly miniaturized or micro-miniaturized", encapsulated and mountable in the space created by the removal of one or more teeth.
  • Remote extension: the patent explicitly notes the system's adaptability for longer-range transmission via higher-power remote transmitters or transceiver relay units — meaning the person carrying the microphone and transmitter need not be in close physical proximity to the subject.


Significance in the V2K Research Lineage

Researchers examining the technical foundations of Voice to Skull and related phenomena consider US 3,267,931 to be a particularly significant document for several converging reasons.

Closed-loop neural audio architecture: The feedback loop described — signal in → facial nerve stimulation → body capacitive return → amplification → re-delivery — is structurally identical to the cybernetic feedback loop attributed to Warren McCulloch and discussed in BOOK 3: The Radiohead Protocol in the context of closed-loop neuro-stimulation systems. This suggests the engineering principles were understood and implemented in hardware as early as the early 1960s.

Covert implant compatibility: The miniaturised intra-oral system is entirely consistent with accounts from Targeted Individuals describing awareness of dental work associated with the onset of Electronic Harassment symptoms. The patent establishes that concealed, body-worn or body-implanted audio delivery hardware was a documented engineering goal at least sixty years ago.

Long-range transmission pathway: The patent's explicit provision for longer-range transmission via external transmitters or transceivers directly supports the long-range V2K hypothesis — that audio content can be delivered remotely to a subject without their knowledge or consent.

Pre-recorded content delivery: The use of a tape recorder as signal source — capable of delivering scripted, pre-recorded voice content — connects structurally to documented claims about the scripted, repetitive, and personalised character of V2K transmissions reported by Targeted Individuals.

Engineering trajectory: Taken as a sequence, patents US 2,995,633 → US 3,156,787 → US 3,267,931 trace a coherent engineering development arc: identification of the facial nerve pathway → refinement of coupling materials → feedback-stabilised, miniaturised, remotely operated delivery system. Researchers argue this sequence is too internally consistent to represent purely academic interest, and point to Puharich's documented intelligence connections as circumstantial evidence of classified sponsorship.

Cross-reference: Synthetic Telepathy, Remote Neural Monitoring, Electronic Harassment, Targeted Individuals, MK-Ultra, Project Moonstruck, Neuroweapons, Bioelectromagnetics.

Patent Claims Summary

The patent contains seven claims, summarised here in plain language:

  1. Claim 1 — The basic system: a signal source producing audio-modulated electrical signals, a high-impedance capacitive coupling electrode applied to the facial nerve system of a human subject, and a feedback coupling path from the subject's body back to the input side of the amplification stage.
  1. Claim 2 — Extends Claim 1 to specify: a microphone, a radio frequency transmitter, and an intra-oral receiver within the oral cavity coupled to the nerves serving the teeth.
  1. Claim 3 — Extends Claim 2 to add: feedback coupling incorporated into the oral cavity RF receiver's amplification stage.
  1. Claim 4 — Specifies the coupling interface: a cup-shaped conductive dental cap placed over a denuded tooth, with dielectric material providing high-impedance capacitive coupling to the nerve endings.
  1. Claim 5 — Extends the dental cap arrangement to include a second dental cap, with conductor connections to the signal source on opposite sides of the amplification stage (establishing the feedback path).
  1. Claim 6 — States the general principle: application of an RF carrier signal to the body, high-impedance capacitive coupling to the facial nerve system, and feedback from the body back to the signal source.
  1. Claim 7 — Specifies the full RF architecture: a transmitter and a matched intra-oral receiver with an amplification stage, and feedback coupling from the body to the input side of the amplification stage.


See Also

External Documents

  • — Full patent document
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