Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 4811402 | Method and apparatus for reducing acoustical distortion A method and apparatus for reducing distortion of an acoustical waveform by locating a plurality of microspheres to interact with interfering acoustical waveforms.... | 03/07/1989 |
| 4800982 | Cleanable in-the-ear electroacoustic transducer A hearing aid including a microphone, an adjustable amplifier, and a transducer comprising an acoustic driver driving a diaphragm disposed within an acoustic chamber, all mounted in an in-the-ear housing having a sound outlet passage leading from the acou... | 01/31/1989 |
| 4763753 | Insert earphones for audiometry Earphones especially adapted for use in audiometry have electroacoustical transducer elements located at a distance from the ear and incorporate coupling paths and chambers so arranged as to eliminate undesirable resonances and to obtain a smooth and accu... | 08/16/1988 |
| 4763752 | Mount for a sound transducer, particularly an earphone A sound transducer, particularly an earphone, is buttoned into a sound opening of an in-the-ear hearing aid housing by means of an elastic hose part seated on a sound connector of the sound transducer. The elastic hose part is slightly pre-stressed in lon... | 08/16/1988 |
| 4729451 | Receiver suspension and acoustic porting system A system for suspending a receiver in a hearing aid and acoustically linking the receiver with the region external to the hearing aid. A shaped mandrel is placed inside the shell of the hearing aid and a liquid material is poured into the shell. The liqui... | 03/08/1988 |
| 4724922 | Acoustic earpiece An improved acoustic earpiece of the type used to transmit sound mechanically from a sound source to the ear drum of a listener is disclosed herein. The acoustic earpiece includes a tube and a resilient element surrounding one end thereof comprising an op... | 02/16/1988 |
| 4716985 | In-the-ear hearing aid The housing of the hearing aid comprises a distal, bead-like head part having a planar face on which an arched face plate is seated and comprises a proximal, thinner tail part. The angle between the normal of the planar face and the longitudinal a... | 01/05/1988 |
| 4679650 | Hearing aid ear mold end piece for the auditory canal and hearing aid ear mold The invention relates to a hearing aid ear mold end piece for the auditory canal, having an outer circumference matching the contours of the auditory canal and a sound discharge opening, whereby end piece (1) is provided on its outer circumference (11) an... | 07/14/1987 |
| 4677679 | Insert earphones for audiometry Insert earphones, which are especially useful for audiometry applications include a transducer which is coupled to a resonance cancellation tube as well as to a main tube which is coupled to the ear, with series acoustic dampers in the tubes, operating in... | 06/30/1987 |
| 4657106 | "Ear" hearing aid A hearing aid adapted to be worn in the ear, comprises a housing receiving a sound transducer and a sound amplifier, the housing being shaped to fit into the ear and having an upper rim, a mounting plate defining a space for holding a battery and a sound ... | 04/14/1987 |
| 4620605 | Suspension for electro-acoustical transducers A moulded suspension for an electro-acoustic transducer in the form of a microphone or a receiver has three regions. A transducer supporting region fits closely around the transducer. A tubular inlet region connects the acoustical inlet or outlet of the t... | 11/04/1986 |
| 4585089 | Coupling element for a hearing aid A coupling element for establishing acoustic connection between a cylindrical hearing aid placed in the concha and a custom made ear plug placed in the auditory canal is formed by a disc-shaped element, which can be rotatably mounted a sound exit nipple o... | 04/29/1986 |
| 4554993 | 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 a cylindrical member formed integrally therewith, a pair of covers each connected to one of the main body ... | 11/26/1985 |
| 4553627 | Hearing aid wax guard A wax guard for a hearing aid is mushroom-shaped, having a cross passage through its head which intersects an axial passage in its stem. The axial passage contains an acoustic filter terminating the axial passage in its characteristic impedance. The cross... | 11/19/1985 |
| 4450930 | Microphone with stepped response A microphone, particularly for hearing aid application, said microphone providing a stepped response characteristic relative to frequency wherein low frequency sounds will couple to the associated hearing aid with a restricted amount of amplification, whi... | 05/29/1984 |
| 4442917 | Vented acoustic ear mold for hearing aids An acoustic ear mold insertable into the ear of an individual with impaired hearing and used in conjunction with a hearing aid having a central metal tube surrounded by a larger diameter metal tube defining a closed resonance chamber so that sound energy ... | 04/17/1984 |
| 4418787 | Hearing aid with audio path duct extension element, and extension element attachment To match the frequency characteristics of the audio or acoustic path of a hearing aid to the remainder of the hearing aid system, an acoustic path extension element (10, 25, 40, 48, 52) is interposed in the acoustic path, the extension element being struc... | 12/06/1983 |
| 4412096 | Combination earmold and receiver adapter An acoustically sealed earmold and a receiver adapter insertable into the ear of an individual with impaired hearing and used in conjunction with an external receiver to evaluate hearing. A unique method of coupling the receiver adapter to the earmold is ... | 10/25/1983 |
| 4407389 | Vented acoustic ear mold for hearing aids An acoustic ear mold insertable into the ear of an individual with impaired hearing and used in conjunction with a hearing aid having a central metal tube surrounded by a larger diameter metal tube defining a closed resonance chamber so that sound energy ... | 10/04/1983 |
| 4403120 | Earphone A high performance and extremely compact earphone is disclosed. The earphone includes a speaker unit and a case in which the speaker unit is mounted. The earphone is attachable to a cavity of a conha defined by the tragus and a confronting projection of t... | 09/06/1983 |
| 4381830 | Continuous flow earmold tubing connector A connector connects sound conduction tubing from a hearing aid to a sound conduction bore in an earmold. The connector is an elbow-shaped member with one end receiving an end of the sound conduction tubing while the other end has latching means that latc... | 05/03/1983 |
| 4349081 | Method for retaining a hearing aid in place and hearing aid harness A method for retaining a hearing aid in place on a person includes providing a harness having a plurality of transverse straps, a connecting longitudinal strap, a chip strap and at least one ear cover. The hearing aid is positioned within or adjacent to t... | 09/14/1982 |
| 4349083 | Acoustic ear mold An acoustic ear mold for intensifying sound pressure for an acoustic signal derived from an electronic hearing aid worn by a patient, characterized by an ear canal component having defined therein a segmented, air-filled resonating cavity including four c... | 09/14/1982 |
| 4349082 | Acoustical damping element and method of forming same An acoustical damping element for acoustical tubing such as a hearing aid earpiece, in which a disc of wire screen is positioned over a disc of flexible fabric of a selected acoustic resistance, over the mouth of the tubing. An insertion tool of diameter ... | 09/14/1982 |
| 4347911 | Acoustic headset An improved acoustic headset of the type used with sound reproduction equipment in airline entertainment systems. The headset has a yoke supporting a pin of curved sound-transmitting horns which terminate in soft tips for insertion in a passenger's ears. ... | 09/07/1982 |
| 4010820 | Acoustic ear mold for hearing aid This disclosure describes an acoustic ear mold insertable into the ear of an individual with impaired hearing and used in conjunction with a hearing aid. Inserted into the molded portion of the ear mold is a central thin-walled metal tube surrounded by a ... | 03/08/1977 |
| 4006796 | Earpiece which substantially consists of a thin-walled flexible capsule filled with a liquid medium An earpiece which takes the form of a pouch made of a plastics foil which surrounds a less pliant plastics tube in an airtight manner and is filled with a sluggishly moving jelly-like paste. A not readily movable compression ring provided with a funnel shaped ... | 02/08/1977 |
