| Patent Number |
Title Of Patent |
Date Issued |
| D531984 |
Stereo headphone earplate |
November 14, 2006 |
|
| D517044 |
Earplate for earphone |
March 14, 2006 |
|
| D449592 |
Stereophone ear plug insert |
October 23, 2001 |
|
| D444141 |
Stereophone ear plug housing |
June 26, 2001 |
|
| D435036 |
Stereophone ear plug |
December 12, 2000 |
|
| D317767 |
Headphone or similar article |
June 25, 1991 |
|
| D301145 |
Stereophone or similar article |
May 16, 1989 |
|
| D265557 |
Stereo headphone |
July 27, 1982 |
|
| D255352 |
Headphone |
June 10, 1980 |
|
| D244301 |
Headphone earpiece |
May 10, 1977 |
|
| D244300 |
Headphone |
May 10, 1977 |
|
| D244213 |
Headphone earpiece |
May 3, 1977 |
|
| 5333206 |
Dual element headphone |
July 26, 1994 |
| A dual element headphone, including a first acoustic transducer mounted within a first housing so as to direct sound in a certain direction out of the first housing. The first housing is sized small enough so as to at least partially fit into the cavum concha of a listener's ear, and yet |
| 5206914 |
Electrostatic acoustic transducer having extremely thin diaphragm substrate |
April 27, 1993 |
| An acoustical transducer unit mountable in a speaker enclosure with a speaker opening adapted to face a user's ear, and a method for manufacturing the transducer. The transducer has a pair of opposing plates spaced apart a predetermined distance and a diaphragm physically connected a |
| 5132890 |
Power supply based on normally parasitic resistance of solid state switch |
July 21, 1992 |
| A current mode zero-voltage, parallel resonant switching power supply. The disclosed power supply includes a resonant tank comprising an inductorcapacitor pair, and having a variable output level. A solid-state switch controls the energy input to the tank. A comparator compares the v |
| 5109424 |
Stereo headphones with plug, receptacle and securing plates |
April 28, 1992 |
| A headphone having a dual element speaker unit including a face plate having an opening generally centrally located therein. A case coupler is mounted in the opening, and has an annular projection protruding through the opening. A first dynamic transducer is mounted within that annular |
| 5099210 |
Battery status indicator |
March 24, 1992 |
| A circuit for monitoring and indicating the outut level of an energy source, such as the voltage level of a battery. The circuit includes a triangle wave generator, and a comparison circuit for comparing the triangle wave form to the battery output level and generating a comparison s |
| 4965836 |
Stereo headphone |
October 23, 1990 |
| A headphone having a dual element speaker unit including a face plate having an opening generally centrally located therein. A case coupler is mounted in the opening, and has an annular projection protruding through the opening. A first dynamic transducer is mounted within that annular |
| 4899388 |
Infrared stereo speaker system |
February 6, 1990 |
| A stereophonic audio system including a device for providing a stereophonic signal, such as an audio receiver. An infrared transmitter connected to the receiver converts the audio signal to an infrared signal to be radiated throughout a signal area. Within this signal area is disposed a |
| 4517418 |
Portable stereophone |
May 14, 1985 |
| A stereophone includes a pair of temporal pads which connect to a headband and engage the user's head above each ear. A support arm pivotally connects to each temporal pad and supports an ear cup over the user's ear. A locking mechanism enables the support arm to be positioned in a numbe |
| 4418248 |
Dual element headphone |
November 29, 1983 |
| A stereophone includes cup assemblies which are supported over the ears of a user by a headband. Each cup assembly includes a piezoelectric acoustic transducer and a dynamic acoustic transducer. The reproduction of the entire audio spectrum is divided between the two transducers at a |
| 4404434 |
Collapsible stereophone |
September 13, 1983 |
| A stereophone includes a headband which supports cup assemblies at each of its ends. The cup assemblies can be pivoted to a transport position in which they are enclosed within the headband. The ends of the headband may be fastened together to retain the cup assemblies in this position. |
| 4302635 |
Headphone construction |
November 24, 1981 |
| A headphone includes a pair of ear cup assemblies attached to a headband. Each ear cup assembly includes a cushion, an earplate, a back plate and an acoustic transducer. These elements snap together and are held together by integral fasteners. Each ear cup assembly is attached to the hea |
| 4275267 |
Ambience processor |
June 23, 1981 |
| An ambience processor receives and combines the left and right channel signals from a stereophonic amplifier. The resulting composite signal is converted to a sequence of digital signals which are stored in a random access memory. The stored digital representation of the composite signal |
| 4260575 |
Method for molding ear cushions |
April 7, 1981 |
| Ear cushions for headphones are formed from an open cell polyurethane foam material. An ear cushion blank is cut from the material and compressed to a desired shape between a holder and a forming tool. Heated air is forced through the porous material to set it to a contoured shape. The m |
| 4170275 |
Ear cushion |
October 9, 1979 |
| A pneumatic ear cushion for a headphone or ear defender is formed from two sheets of vinyl plastic. One sheet is molded to form concentric inner and outer walls about a central opening and a connecting sealing wall which is shaped to form a cavity that receives the user's ear. The second |
| 4066849 |
Rotary-type control for headphone earpiece |
January 3, 1978 |
| A rotary-type control for a headphone earpiece has an indexing dial which is loosely keyed to the control shaft of a potentiometer and extends partially through an opening in the cover of the earpiece to permit the wearer of the earpiece to manually control the potentiometer. The loosely |
| 3999020 |
Transducer with variable frequency response |
December 21, 1976 |
| An audio transducer for a headphone includes ports which couple the rear of the transducer diaphragm to the interior of the cup. A resilient acoustic damping material is placed over the ports and is variably compressed by an adjustable clamp to provide a selectable frequency response cur |
| 3992585 |
Self-energizing electrostatic loudspeaker system |
November 16, 1976 |
| A power supply for generating polarizing voltages for the drivers on an electrostatic speaker system includes a charging circuit which charges a battery from the applied audio signal. A dc-to-dc converter generates the relatively high polarizing voltages from the battery voltage and it |
| 3984636 |
Quadraphonic headphone with ambience programmer |
October 5, 1976 |
| A quadraphonic headphone including an ambience control circuit which is contained within a hand sized case which is connected to the audio transducers in each headphone cup and which may be connected to a source of quadraphonic program material. The control circuit includes switches |
| 3931469 |
Crossover network for a multi-element electrostatic loudspeaker system |
January 6, 1976 |
| A four-way electrostatic speaker system includes four step-up transformers which have their primary windings connected in a series-parallel circuit across an audio signal source. Electrostatic drivers connect to the secondary windings of each step-up transformer and each forms a parallel |
