Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 4646872 | Earphone An earphone having a housing, a speaker unit accommodated in the housing and a duct formed in the housing to pass sound emanated from the rear surface of the speaker unit and in which a mesh subjected to water repellent treatment is provided within the du... | 03/03/1987 |
| 4584718 | Waterproof enclosure for portable radio or tape player A waterproof enclosure for a portable radio, tape recorder/player, or the like includes a flexible membrane with a finger control pocket adjacent the control knobs of the radio, an opening for inserting and removing the radio from the enclosure with a wat... | 04/22/1986 |
| 4565258 | Stereo headset system for use in a wet environment The present invention is a stereo headset system for use with a stereo headset device and a stereo sound system. The stereo headset device is of the stethoscope type and has a pair of sound tubular mains. A coupling plug is mechanically and acoustically c... | 01/21/1986 |
| 4385211 | Reflex horn speaker with a waterproofing device A reflex horn speaker with a waterproofing device for use on a ship or the like is disclosed. The reflex horn speaker comprising a sound generator, an inner cylindrical horn, a conical reflector concentrically arranged around the inner horn, and an outer ... | 05/24/1983 |
| 4196791 | Speaker grill including stress regions The speaker grill is a part of a molded plastic member which may form a wall of housing for a device which includes an audio transducer. The plastic member includes provisions for supporting the audio transducer adjacent the grill, which has openings for ... | 04/08/1980 |
| 4180140 | Loudspeaker porting In a loudspeaker system having eight drivers on a baffle, the baffle has two port openings centered in respective squares embracing respective groups of four drivers. A tubular column extender snaps into each port opening and has a snap cap for detachably... | 12/25/1979 |
| 4161995 | Loudspeaker housing forming a closed, damped system, particularly for automotive installation The loudspeaker is mounted within a hollow, essentially tubular body so that the loudspeaker structure extends into the tubular body. The tubular body is at least in part insertable into an opening of a vehicle panel, such as a dashboard, rear window shel... | 07/24/1979 |
| 4123622 | Protective cover for sound transducers located in face masks of divers A moisture protective housing for a sound transducer located inside the face mask of a diver which face mask is vented to a breathing apparatus, such as a scuba tank with regulator, to maintain the air breathed by the diver at substantially the same press... | 10/31/1978 |
| 4071111 | Weatherproof loudspeaker assembly and method of making same A weatherproof loudspeaker assembly includes a box-like one-piece open-front plastic housing and a corrugated fiberboard member folded so as to line the inside of the housing with two crossed layers of corrugations on each of the walls surrounding the ope... | 01/31/1978 |
| 3987258 | Water-proof sound apparatus A water-proof sound apparatus comprising a sealed cabinet, filter means attached to said cabinet which is permeable to gases and impermeable to liquids, a speaker attached to said cabinet which has a water-proof construction, and a grill covering the fron... | 10/19/1976 |
| 3938618 | Speaker grille screen and mounting structure A speaker system for a small radio device includes a cover plate having slots therein and a rigid grille screen having channels which extend into the slots. The cover plate and grille screen are generally planar and parallel to each other, and the channel... | 02/17/1976 |
