| |
 |
|
Class Information
Number: 381/79
Name: Electrical audio signal processing systems and devices > One-way audio signal program distribution > Near field
Description: Subject matter which is a near field or limited range system (i.e., field strength 1/d where d = distance from the transmitter to the receiver) where signal transfer from transmitter to receiver is inductive or capacitive rather wired.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5818949 |
Microphone with infared on/off switch |
Oct. 6, 1998 |
| 5668884 |
Enhanced concert audio system |
Sep. 16, 1997 |
| 5619582 |
Enhanced concert audio process utilizing a synchronized headgear system |
Apr. 8, 1997 |
| 5615229 |
Short range inductively coupled communication system employing time variant modulation |
Mar. 25, 1997 |
| 5596649 |
Sound concentrator for selectively collecting sound and concentrating and transmitting the collected sound |
Jan. 21, 1997 |
| 5491839 |
System for short range transmission of a plurality of signals simultaneously over the air using high frequency carriers |
Feb. 13, 1996 |
| 5440630 |
Telephone receiver with electrostatic discharge prevention |
Aug. 8, 1995 |
| 5432858 |
Enhanced concert audio system |
Jul. 11, 1995 |
| 5420930 |
Hearing aid device |
May. 30, 1995 |
| 5361306 |
Apparatus and methods for enhancing an electronic audio signal |
Nov. 1, 1994 |
| 5361381 |
Dynamic equalizing of powered loudspeaker systems |
Nov. 1, 1994 |
| 5319716 |
Wireless CD/automobile radio adapter |
Jun. 7, 1994 |
| 5276910 |
Energy recovering hearing system |
Jan. 4, 1994 |
| 5218641 |
Wireless receiver |
Jun. 8, 1993 |
| 5020155 |
Audio commentary system |
May. 28, 1991 |
| 4985922 |
Signal and power transmission through a wall |
Jan. 15, 1991 |
| 4944017 |
Electroacoustic insert with added coil |
Jul. 24, 1990 |
| 4941207 |
Structure for wireless communication in an electromagnetically shielded building |
Jul. 10, 1990 |
| 4920570 |
Modular assistive listening system |
Apr. 24, 1990 |
| 4918736 |
Remote control system for hearing aids |
Apr. 17, 1990 |
| 4918737 |
Hearing aid with wireless remote control |
Apr. 17, 1990 |
| 4908869 |
Induction-based assistive listening system |
Mar. 13, 1990 |
| 4833337 |
Inductive coupled power system |
May. 23, 1989 |
| 4824375 |
Sound-producing amusement or eductional apparatus |
Apr. 25, 1989 |
| 4736452 |
Core coupled transmitter/receiver loops for connectorless entertainment systems |
Apr. 5, 1988 |
| 4508936 |
Local external communication system |
Apr. 2, 1985 |
| 4489330 |
Electromagnetic induction coil antenna |
Dec. 18, 1984 |
| 4457019 |
System for separately receiving multiple station audio-tour signals |
Jun. 26, 1984 |
| 4428078 |
Wireless audio passenger entertainment system (WAPES) |
Jan. 24, 1984 |
| 4361733 |
Hard-of-hearing aid appliance |
Nov. 30, 1982 |
| 4354061 |
Sensing coil in hearing aid |
Oct. 12, 1982 |
| 4165487 |
Low power system and method for communicating audio information to patrons having portable radio receivers |
Aug. 21, 1979 |
| 4061972 |
Short range induction field communication system |
Dec. 6, 1977 |
| 3996518 |
Inductive carrier communication systems |
Dec. 7, 1976 |
|
|
|
