U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Inductively coupled wireless system and method

Patent 6424820 Issued on July 23, 2002. Estimated Expiration Date: Icon_subject April 2, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

Preselector cavity arrangement and RF selectivity assembly
Patent #: 4019141
Issued on: 04/19/1977
Inventor: Numan ,   et al.

Apparatus for wireless transmission of a teaching program in a classroom
Patent #: 4229829
Issued on: 10/21/1980
Inventor: Grunwald

System transmitting and receiving digital and analog information for use in locating concealed conductors
Patent #: 5264795
Issued on: 11/23/1993
Inventor: Rider

Combination head-protective helmet & communications system
Patent #: 5404577
Issued on: 04/04/1995
Inventor: Zuckerman, et al.

Wireless communications using near field coupling
Patent #: 5437057
Issued on: 07/25/1995
Inventor: Richley, et al.

Very low power cordless headset system
Patent #: 5568516
Issued on: 10/22/1996
Inventor: Strohallen, et al.

Integrated sound/telephone headset system
Patent #: 5694467
Issued on: 12/02/1997
Inventor: Young, III

Short-range magnetic communication system
Patent #: 5771438
Issued on: 06/23/1998
Inventor: Palermo, et al.

Small, battery operated RF transmitter for portable audio devices for use with headphones with RF receiver
Patent #: 5771441
Issued on: 06/23/1998
Inventor: Altstatt

System for assigning multichannel audio signals to independent wireless audio output devices
Patent #: 5867223
Issued on: 02/02/1999
Inventor: Schindler, et al.

More ...

Inventors

Application

No. 285511 filed on 04/02/1999

US Classes:

455/41.1, Near field (i.e., inductive or capacitive coupling)455/132, Plural receivers455/151.2Wireless link (sonic, RF, or infrared)

Examiners

Primary: Trost, William
Assistant: Nguyen, Simon

Attorney, Agent or Firm

International Class

H04B 005/00

Abstract

A short range inductively coupled wireless communication system employs analog frequency modulation of a high frequency carrier and magnetic coupling between a transmitting antenna and a receiving antenna. A transmitter coupled to the transmitting antenna modulates multiple high-fidelity analog audio signals and digital control messages onto separate high frequency ("HF") carriers. The electric field portion of the transmitted electromagnetic field is substantially eliminated during transmission, while the magnetic field portion is substantially unaffected. The receiving antenna is coupled to a demodulator which reproduces the audio frequency signals and decodes control messages sent by the transmitter.

PatentsPlus Images
Enhanced PDF formats
loading...
PatentsPlus: add to cart
PatentsPlus: add to cartSearch-enhanced full patent PDF image
$9.95more info
PatentsPlus: add to cart
PatentsPlus: add to cartIntelligent turbocharged patent PDFs with marked up images
$18.95more info
 
Sign InRegister
Username  
Password   
forgot password?