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...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 8050432 | Sound system To conclude, in a preferred embodiment in accordance with the invention, the sound system comprises two loudspeakers (LA, LB) which mask their spectral signatures at the ear (C1) of the listener by positioning the two loudspeakers (LA, LB) such that their max... | 11/01/2011 |
| 8041061 | Dipole and monopole surround sound speaker system A speaker system utilizes dipole speaker drivers in conjunction with monopole speaker drivers in a listening area to disperse a surround sound effect to a listener. The dipole speaker drivers are physically mounted on top of the front left and right speakers and are... | 10/18/2011 |
| 7441630 | Multi-driver speaker system A speaker unit includes first and second drivers carried by first and second enclosures. A first linkage supports the second driver enclosure relative to the first driver enclosure and provides at least two positional degrees of freedom of movement of the second dri... | 10/28/2008 |
| 7367423 | Speaker assembly with aiming device A speaker assembly aimable relative to a remote target. The speaker assembly comprising a sound generating device configured to project sound in a sound pattern about a sound axis. A speaker aiming device is coupled to the sound generating device for use in visually... | 05/06/2008 |
| 7184562 | Loudspeaker apparatus A loudspeaker apparatus in which sound from a loudspeaker is emitted from a top surface of a loudspeaker cabinet, wherein the top surface is slanted obliquely backward and in which a sound reflecting panel is mounted such that that the panel can swing on the rear pl... | 02/27/2007 |
| 7158642 | Method and apparatus for producing a phantom three-dimensional sound space with recorded sound A central speaker and personal headset speakers are used to create a three-dimensional phantom sound space for each listener. The speakers of the headset are located in close proximity to, but do not isolate, the ears of the listener such that external sounds are al... | 01/02/2007 |
| 6748093 | Hearing aid with a tightening ring The present invention relates to a hearing aid for insertion in the auditory canal, comprising a hearing aid housing and a face plate and a shell that is matched to the auditory canal of a user and has a tightening protrusion that extends along the surface of the sh... | 06/08/2004 |
| 6324052 | Personal computing devices comprising a resonant panel loudspeaker A personal computing device, such as a lap-top computer, has a body with a keyboard, a lid with a display screen hinged to the body, a resonant panel loudspeaker carried by the lid and an acoustic waveguide on the lid to direct acoustic output from the lo... | 11/27/2001 |
| 6175489 | Onboard speaker system for portable computers which maximizes broad spatial impression A stereo speaker system for portable computers which maximizes spatial impression by using rearward-firing speakers, mounted in the back of the display, in combination with forward-firing speakers mounted on the chassis or in the front side of the display... | 01/16/2001 |
| 5872856 | Surround speaker A surround speaker system implements the speaker of a dipolar acoustic radiation characteristic by being installed in an upper part of a speaker stand, or it implements a surround speaker of a monopolar acoustic radiation characteristic by being installed... | 02/16/1999 |
| 5349575 | Portable audio device A portable audio device having the functions of a cassette tape recorder, a compact disc player and an AM/FM tuner includes a slimmed body provided with the cassette tape recorder, the compact disc player and the AM/FM tuner, and at least one cover, provi... | 09/20/1994 |
| 5144670 | Sound output system A sound output system has a pair of right and left speakers and a pair of audio mirrors for respectively controlling directivities of sounds which are output from the pair of speakers. The shapes or arrangement of the pair of audio mirrors are adjusted su... | 09/01/1992 |
| 5109416 | Dipole speaker for producing ambience sound A dipole speaker for use with a multichannel sound reproduction system for producing an acoustical ambience signal. The dipole speaker comprises a transducer which is connected to the sound reproduction system so that it receives a difference signal from ... | 04/28/1992 |
| 5093865 | Reflecting sound imaging speaker enclosure The direct and reverberant sound fields heard at a live musical performance are reproduced by a speaker enclosure consisting of two sub-enclosures mounted on a base with each subenclosure housing at least one speaker, thereby realistically reproducing the... | 03/03/1992 |
| 4888804 | Sound reproduction system A sound reproduction system for providing an enhanced stereophonic image within an enlarged listening area includes both a left and a right transducer enclosure, each enclosure having a main transducer array for receiving an audio channel signal and provi... | 12/19/1989 |
| 4847904 | Ambient imaging loudspeaker system Sound reproduction apparatus comprising a pair of loudspeaker systems each including a plurality of loudspeakers for producing audio signals in response to respective electrical right (R) and left (L) stereophonic signals. Each system is mounted in an enc... | 07/11/1989 |
| 4757544 | Multi-directional speaker system A multi-directional speaker system for use in combination with a sound source comprising an adjustable speaker support structure to operatively support a plurality of speakers each operable within a discrete frequency range and an electrically conductive ... | 07/12/1988 |
| 4723289 | Stereo electroacoustic transducing A stereo loudspeaker system includes left and right loudspeaker cabinets each having a woofer mounted off center on the front baffle and tweeters mounted in front of the woofer with the axis of each tweeter at an angle to that of the woofer. Each cabinet ... | 02/02/1988 |
| 4701951 | Acoustic imager An improved stereophonic imaging system with two stand-alone cabinet units 10, 12 each having a front baffle with sound emitting bass midrange B1, B2 and tweeter T1, T2 drivers symmetrically arranged about a common vertical plane to emit directly radiated... | 10/20/1987 |
| 4569074 | Method and apparatus for reproducing sound having a realistic ambient field and acoustic image Apparatus for reproducing sound having a realistic ambient field and acoustic image is used in a stereophonic sound reproduction system having a left channel output and a right channel output. A right main speaker and a left main speaker are disposed at r... | 02/04/1986 |
| 4497064 | Method and apparatus for reproducing sound having an expanded acoustic image Apparatus for reproducing sound having an expanded acoustic image is used in a stereophonic sound reproduction system having a left channel output and a right channel output, which need not be binaural. A right main speaker and a left main speaker are dis... | 01/29/1985 |
| 4489432 | Method and apparatus for reproducing sound having a realistic ambient field and acoustic image Apparatus for reproducing sound having a realistic ambient field and acoustic image is used in a stereophonic sound reproduction system having a left channel output and a right channel output. A right main speaker and a left main speaker are disposed at r... | 12/18/1984 |
| 4388492 | Miniature stereo device with extensible speakers A miniature stereo device which provides a satisfactory stereo effect includes a main body having an audio device which generates a stereo output, and a pair of speakers positioned at both sides of the main body for reproducing the stereo output. One of t... | 06/14/1983 |
| 4199658 | Binaural sound reproduction system The speaker system of the invention comprises a pair of inner and outer rightward loudspeakers and a pair of inner and outer leftward loudspeakers all of which are arranged such that their points of sound transmission are aligned on an equal vertical stra... | 04/22/1980 |
| 4058675 | Loudspeaker system for use in a stereophonic sound reproduction system In order to improve characteristics of localization of sound images and a listener's sense of stereophonic perspective, a loudspeaker system for a stereophonic sound reproduction system comprises a main speaker adapted to be driven by audio input signal a... | 11/15/1977 |
| 3943564 | Stereophonic recording and playback apparatus Apparatus for making stereophonic recordings using multiple microphones, and playing back the recordings through multiple speakers, wherein each of the microphones is mounted with a corresponding speaker in a single enclosure. For convenience, the microph... | 03/09/1976 |
