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3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 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 |
| 4800636 | Process for manufacturing an in-the-ear canal hearing aid The invention relates to a process for manufacturing an in-the-ear-canal hearing aid with microphone, amplifier, volume control, battery compartment with battery, and earphone, together with an individually matched ear-piece by making an impression of the... | 01/31/1989 |
| 4783816 | Hearing aid to be worn behind the ear having battery and volume control facing in opposite directions A hearing aid of the type which is worn behind the ear has a battery compartment and a volume control knob at its lower end. The compartment and knob are at right angles to the longitudinal axis of the device.... | 11/08/1988 |
| 4783815 | Manufacturing miniature hearing aid having a multi-layer circuit arrangement As opposed to standard circuit board fabrication techniques, whereby plated holes are commonly bored through all the layers of a multilayer board, the circuit board for a hearing aid according to the invention is fabricated by alternatingly forming plated... | 11/08/1988 |
| 4756312 | Magnetic attachment device for insertion and removal of hearing aid A direct contact hearing aid apparatus adapted to be mounted deep within the ear canal is disclosed, including an output electromechanical transducer for converting audio output signals into mechanical movement of an output coupling element without the pr... | 07/12/1988 |
| 4742887 | Open-air type earphone An earphone has a housing divided by a driver unit into front and back cavities with a sound generation opening at the front thereof, a duct extending from the back cavity of the housing and having a length substantially larger than its diameter, and a ca... | 05/10/1988 |
| 4735759 | Method of making a hearing aid A hearing aid including a plug that is tailored to snugly fit into the auditory canal of the user's ear, and that has a preshaped component assembly embedded therein, the component assembly comprising shell-like members that are interconnected to each oth... | 04/05/1988 |
| 4736435 | Ear piece transducer This invention relates to a compact electro-acoustic transducer (10) to be used in the ear hole which prevents oppressive and inharmonious sensations to the auricle (A) when used and also prevents the deterioration of the reproduced sound quality. To do t... | 04/05/1988 |
| 4736430 | Hearing aid To provide for better fitting and pleasing out appearance of a hearing aid having an element introducible into the ear canal of a user, and an externally accessible housing which retains electronic components, a battery, and ON/OFF switch and volume contr... | 04/05/1988 |
| 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 |
| 4727582 | Hearing aid with adjustable flexible connection member A hearing aid, in particular a behind-the-ear hearing aid, comprising a first unit (1) that includes an amplifier (4), a hook (3) formed with a duct (16) and a space (8). A second unit (2) includes an electro-acoustic transducer (12). The second unit is i... | 02/23/1988 |
| 4710961 | Miniature hearing aid having a bindable multi-layered amplifier arrangement A miniature hearing aid comprises an input transducer (18), amplifier (19) and control elements (8, 10) as well as a current source and output transducer (20), where at least a part of the amplifier (19) is applied on mounting surfaces hinged together and... | 12/01/1987 |
| 4706778 | In-the-ear-canal hearing aid The invention relates to an in-the-ear hearing aid for people with impaired or defective hearing, with an ear-piece containing a microphone, amplifier, telephone, battery compartment with battery, on/off switch and volume control and closed by a cover pla... | 11/17/1987 |
| 4702345 | Hearing aid retention device In a hearing aid of the type, including a battery containing housing supported rearwardly of the ear auricle by an elongated tube joining one end of the housing to an ear opening contained ear molding, an endless flexible ring surrounds the ear auricle at... | 10/27/1987 |
| 4677675 | Response-modifying acoustic couplers for hearing aids Response-modifying acoustic couplers are provided for use between an output port of a hearing aid unit and an earmold at the entrance to the ear of a wearer, including a passage and a chamber which respectively provide a high acoustic inertance and a high... | 06/30/1987 |
| 4634815 | In-the-ear hearing aid A face plate includes a passage for receiving a button cell. Disposed on the back of the face plate is a mounting plate. Between the mounting plate and the face plate, the edge of a diaphragm is gripped, the center part of which bulges resiliently outward... | 01/06/1987 |
| 4628907 | Direct contact hearing aid apparatus A direct contact hearing aid apparatus adapted to be mounted deep within the ear canal is disclosed, including an output electromechanical transducer for converting audio output signals into mechanical movement of an output coupling element without the pr... | 12/16/1986 |
| 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 |
| 4598177 | Hearing aid with self-contained battery compartment and volume control A hearing aid of the self-contained type. The hearing aid includes a unitary housing shaped for insertion into an ear of a wearer. The housing has a face plate adapted to face outwardly of the ear of the wearer. A first opening is provided in the face pla... | 07/01/1986 |
| 4592087 | Class D hearing aid amplifier A subminiature power amplifier for hearing aids configured to be completely self-contained and fit within the user's ear features a Class D amplifier stage. By configuring all signal elements as digital units, circuit balance is readily maintained. A subs... | 05/27/1986 |
| 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 |
| 4584437 | Hearing aids of the type intended to be fitted in the external auditory meatus of the user A hearing aid having a closure plate which is removably joined through the use of screws. A battery cover is pivotable into a position where it can be easily gripped by a user's fingers so that it can aid in positioning the aid in the user's ear.... | 04/22/1986 |
| 4565904 | Removal handle for in-the-ear hearing aids In-the-ear type hearing aid devices having means for receiving and amplifying sound external to the ear are improved by the addition of a handle which aids in the removal of the device from an ear. The handle includes an elongated member which is preferab... | 01/21/1986 |
| 4564955 | Coupling for use in the securing of a hook-shaped sound part on a behind-the-ear hearing aid A coupling for use in securing a hook-shaped sound part on a behind-the-ear hearing aid consists of a two part connector with a free position in which the parts can be assembled and separated, and a coupled position in which the hook-shaped part can be tu... | 01/14/1986 |
| 4550227 | In-the-ear hearing aid A hearing aid which can be worn in the ear concha and which contains a microphone, an amplifier, an earphone, a battery and a connection to an ear adapter. All components are mounted in a flat, cylindrical housing (1), whose cover (2) can be rotated aroun... | 10/29/1985 |
| 4539440 | In-canal hearing aid An in-canal hearing aid is inserted and worn within the auditory canal of a hard-of-hearing wearer. This hearing aid has a generally-cylindrical body with a resilient stretchable outer layer and an adjustably expandable member therewithin for changing the... | 09/03/1985 |
| 4509193 | Miniature acoustical transducer with filter/regulator power supply circuit A battery-powered miniature acoustical transducer system for a hearing aid, including a microphone and an amplifier, has a combination filter and voltage regulator incorporated in its power supply circuit; the filter/regulator includes a field-effect tran... | 04/02/1985 |
| 4456795 | Behind-the-ear type hearing aid A behind-the-ear type hearing aid which includes a main body adapted to hang on the user's earlobe on the rear side, an opening disposed at the front end of the main body to communicate with a microphone used for normal conversation, and a pair openings d... | 06/26/1984 |
| 4440982 | Hearing aid A hearing aid includes a duct (10) for transmitting the sound from the receiver (2) to the exterior of the housing (1) of the hearing aid. The duct is formed in a component (9) which is constituted by a body of an elastic damping material and which also s... | 04/03/1984 |
| 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 |
| 4375016 | Vented ear tip for hearing aid and adapter coupler therefore The disclosure is directed to a vent adapter for an ear tip coupling for use with a modular "In The Ear" hearing aid. The ear tip has a bulbous distal tip portion with a sound delivering aperture and a plurality of vent apertures therein. In the assembly,... | 02/22/1983 |
| 4354065 | Miniature hearing aid In an exemplary embodiment, a two-part housing for the microphone, ear piece receiver and battery, also serves to contain an amplifier. The disclosure provides a fastening of the amplifier which is effective in a simple manner and without additional space... | 10/12/1982 |
| 4347956 | Hearing aid sheath and body harness A holder and harness for an auditory trainer for children with impairment of hearing which includes a leather or plastic compartment case fashioned from a blank of sheet material with double panel bottom and back wall and flaps extending from the top and ... | 09/07/1982 |
| 4329676 | Potentiometer A potentiometer providing a variable electrical resistance between input and output terminals for use in electronic circuits, as for volume control, light control, instrumentation control or the like. A potentiometer includes a housing assembly comprised ... | 05/11/1982 |
| 4311206 | Hearing aid ear mold with improved discrimination An improved type of ear mold which is used with a hearing aid of conventional design, but is provided with an inner chamber, to which sound is communicated from the hearing aid through a plastic tube, and from which the sound is communicated to the inner ... | 01/19/1982 |
| 4152551 | Pocket hearing aid with slideable mechanism for battery replacement and access openings An essentially parallelepiped-shaped housing has a slide at which there is formed a drawer-like constructed compartment for the reception of a current source. In the closed position of the slide such coincides with one of the base surfaces of the housing.... | 05/01/1979 |
| 4133984 | Plug-type hearing device A plug-type hearing device comprising a sound-leading portion being inserted into the auditory miatus, a first envelope attached around the sound-leading portion, a second envelope being positioned at the outside of the auditory miatus and being communica... | 01/09/1979 |
| 4130741 | Hearing aid reliner and apparatus for relining hearing aid ear molds For the ear mold which fits in the ear canal of the ear of a wearer of a hearing aid, a reliner to hermetically seal between the surface of the ear mold and the tissues of a wearer to eliminate feedback and wherein the coating is applied and is selected f... | 12/19/1978 |
| 4090040 | Hearing aid with acoustical frequency response modification A hearing aid for individuals with a loss of sensitivity to the higher frequencies acoustically attenuates the lower frequencies by providing a sound reproducer coupled to a sound delivering conduit provided with an aperture of prescribed size coupled to ... | 05/16/1978 |
| 4073366 | Disposable noise reducing hearing aid attachment A disposable noise reducing hearing attachment provided for covering the sound inlet of a hearing aid to reduce the amplitude of random noises such as wind noises and to prevent dirt and moisture from entering the sound inlet. The attachment includes a fl... | 02/14/1978 |
