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| Number | Title | Issue Date |
| 5209226 | Underwater respiratory device An air supply system which communicates between the compressed air supply and the mouth of a scuba diver utilizes a sealing cup which surrounds the mouth to define a breathing/microphone chamber into which the diver can speak. In addition to this chamber ... | 05/11/1993 |
| 4932495 | Vocal sound muffling device A vocal sound muffling device having an elongated tubular body providing an elongated tubular cavity, a mouthpiece on one end of the body providing an inlet into the cavity for vocal sound waves and atomized fluids, a closure on the other end of the body ... | 06/12/1990 |
| 4926961 | Hinged acoustical voice tube An acoustical voice tube, comprising an acoustical hollow upper piece and an acoustical hollow lower piece in hinged connection permits voice or sound tube positioning over a large area without changing the sound characteristics.... | 05/22/1990 |
| 4839871 | Underwater communication device An underwater speaker system having a pressure equalization system enabling the speaker to operate in its intended fashion over a wide range of water depths, e.g. from two feet up to sixty feet. Water pressure is applied to a diaphragm that forms one wall... | 06/13/1989 |
| 4527657 | Tapered tube impedance matching underwater voice communicator with bubble silencer An underwater voice communicator in which the preferred embodiment comprises a pair of tapered tubes in communication with a diver's mouth. The tubes are constructed of a material having a sound impedance similar to the sound impedance of water. Sound ene... | 07/09/1985 |
| 4527658 | Bubble silencer for an underwater voice communicator A bubble silencer for use with scuba equipment is comprised of a flat flexible enclosure attached to a scuba regulator valve. Exhaust bubbles issuing from the regulator into the enclosure coalesce into large air parcels to be expelled at low velocity thro... | 07/09/1985 |
| 4505358 | Voice communicator Direct voice communication with simultaneous two-way transmission is possible with a communicator having the earpiece of the communicator at one station connected by flexible plastic tubing to the mouthpiece of a communicator at another station, the two s... | 03/19/1985 |
| 4473130 | Crash helmet with communication system A crash helmet for use by motorcycle drivers or riders has a rigid shell; a first flexible acoustic tube a first section of which extends into and has a bell horn in the region of the mouth-protecting part of the shell, and a second section extending from... | 09/25/1984 |
| 4472607 | Inflight headset for civil aircraft The present invention relates to an inflight headset for civil aircraft and in particular to one comprising a pair of main body portions each having an adjusting rod, a pair of covers each connected to one of said main body portions, a headband having a c... | 09/18/1984 |
| 4183422 | Underwater communications device A communications device for use under water by a human speaker. A tubular base member has a mouthpiece located at one open end thereof and an inflatable air bag mounted about another open end thereof. In use, the speaker places the mouthpiece around his m... | 01/15/1980 |
| 4174155 | Sound absorbing article and methods of constructing and utilizing same A sponge sound absorbing article for placement on the side frames of eyeglasses for workers employed in very noisy environments. The sound absorbing article eliminates any sound gap between the sides of the eyeglass frames and conventional earmuffs to pro... | 11/13/1979 |
