Tynax ~ Patent Library

Patent for Sale:

DCT and Home Automation Patent Portfolio    

Designs and methods for digital cordless telephone and other wireless devices


This portfolio of patents enables the design of innovate RF radios and other devices and systems that form the basis of today’s highly popular digital cordless telephones and wireless communication devices in the home. The patents in this portfolio cover RF circuit innovations and fundamental improvements in Direct Sequence Spread Spectrum (DSSS) technology commonly used in digital phones. The patents represent some of the innovations based on years of experience and pioneering development. However these assets are no longer core to the sellers’ business and are therefore being made available to leading companies currently manufacturing or using related products in the market.

Digital modulation and coding offer more robust voice communication over a radio channel than analog modulation. Digital modulation also provides a more noise‐free conversation by suppressing co‐channel and adjacent channel interference. Additionally, with digital modulation and coding, effective scrambling codes can be added to improve phone security.

An earlier advancement has been to use the 902‐928 MHz Industrial, Medical and Scientific (ISM) band for radio transmission and reception. The Federal Communications Commission (FCC) in the U.S. allows transmitters in this band to have increased power levels, as compared to the 46/49 MHz band, which increases the useful operating range. At the highest transmit power levels, which are needed by a digital phone to overcome interference, the FCC requires that the phone system implement spread spectrum modulation.

Later around 1998, devices using the ISM frequency band at 2.4 GHz came on the market, followed by the 5.8 GHz band.

Many of the innovations included in this portfolio have been developed in relation to cordless phone device product lines, but they are not limited to cordless phones. Home automation systems based on wireless uses similar technologies. The patents have wide applicability in wireless and wired communication systems such as DSSS, FSK modulation, coding, echo cancelling, etc. and find use in many proprietary wireless data link products. Further, DSSS is the basis of other systems such as CDMA and IEEE802.11b; therefore many of these patents may have applicability in those systems also.

Wireless devices continue to be popular for consumers worldwide. The home automation product sales are growing. The cordless telephone segment itself remains stable, with total base station unit sales around 115 to 105 million units and total handset sales around 180 to 160 million units in recent years.

The sellers patents offer improvements in fundamental design and important performance features of Digital Cordless Telephones and wireless devices. Furthermore, these patents read on many other communication products, including some CDMA mobile handsets based on DSSS fundamentals.

Primary Application of the Technology

Wireless devices
Home automation

The seller may consider selling these patents individually.

Additional Information

Foreign counterparts included in sale.

Patent Summary

U.S. Patent Classes & Classifications Covered in this listing:

Class 714: Error Detection/Correction And Fault Detection/Recovery

This class provides for process or apparatus for detecting and correcting errors in electrical pulse or pulse coded data; it also provides for process or apparatus for detecting and recovering from faults in electrical computers and digital data processing systems, as well as logic level based systems.

Subclass 708: Shutdown or establishing system parameter (e.g., transmission rate)
Subclass 759: Look-up table encoding or decoding

Class 455: Telecommunications

This is the generic class for modulated carrier wave communications not elsewhere classifiable.

Subclass 462: Including private cordless extension system
Subclass 464: Channel selection or allocation
Subclass 465: Including public cordless extension system
Subclass 134: By signal strength
Subclass 183.1: With frequency synthesizer
Subclass 234.1: Automatic
Subclass 260: Phase lock loop or frequency synthesizer
Subclass 277.2: By signal quality (e.g., noise)

Class 331: Oscillators

This is the generic class for electrical oscillators.

Subclass 11: Plural comparators or discriminators

Class 375: Pulse Or Digital Communications

This is the generic class for pulse or digital communication systems using electrical or electromagnetic signals. Such communication includes transmitting an intelligence bearing signal from one point to another in the form of discrete variations in some parameter of the electrical or electromagnetic signal.

Subclass 140: Direct sequence
Subclass 141: End-to-end transmission system
Subclass 146: Transmitter
Subclass 147: Receiver
Subclass 149: Having specific code synchronization
Subclass 152: Matched-filter-type receiver
Subclass 219: TRANSCEIVERS
Subclass 244: Differential
Subclass 272: Frequency shift keying
Subclass 295: TRANSMITTERS
Subclass 303: Frequency shift keying
Subclass 316: RECEIVERS
Subclass 334: Frequency shift keying
Subclass 342: Locating predetermined portion of pulse
Subclass 344: Automatic frequency control
Subclass 345: Automatic gain control
Subclass 347: Diversity (frequency or time)
Subclass 351: Gating, blanking, etc.
Subclass 355: Synchronizing the sampling time of digital data
Subclass 367: Pseudo noise
Subclass E1.002: Using direct sequence modulation (EPO)
Subclass E1.005: Code identification (EPO)
Subclass E1.033: Using frequency hopping (EPO)

Class 370: Multiplex Communications

This is the generic class for multiplexing or duplexing systems, methods, or apparatus.

Subclass 514: Unique synchronization word or unique bit sequence

Class 329: Demodulators

A demodulator is a device which extracts an arbitrarily varying information carrying signal from a signal formed by varying a characteristic of a repetitious electrical or electromagnetic wave of less than infrared frequency in accordance with this information carrying signal. Classification herein is broadly by the type of modulation exhibited by the input signal. Combinations with basic subject matter included in this class: a demodulator combined with perfecting structure or incorporated in other structure.


Class 341: Coded Data Generation Or Conversion

1) originating or emitting a coded set of discrete signals or 2) translating one code into another code wherein the information signal content remains the same but the formats may differ. For classification herein, at least one of the codes must be a set of pulses or digits and electrical in nature.

Subclass 139: Automatic control for increasing converter range (e.g., gain ranging, automatic gain control)
Subclass 143: Differential encoder and/or decoder (e.g., delta modulation, differential pulse code modulation)

Class 379: Telephonic Communications

(1) Systems, processes and instruments for the two-way electrical transmission of intelligible audio information having arbitrary content over a link including an electrical conductor, between spaced apart locations, so as to enable conversation therebetween, and intended for the private use of a listener or a group of listeners. The term "intelligible" used above is intended to include the capability for transmission of speech or the like (e.g., music), rather than restriction to a specified audible signal, such as a bell or buzzer. (2) Switching, signalling or signal transmission peculiar to, or specified as for a telephone or a telephone system, except for multiplex communications as indicated in Lines With Other Classes.

Subclass 93.23: Having user information display (e.g., telephone number, name, address, etc.)
Subclass 93.35: Having call-waiting
Subclass 142.04: Extracting call ID from transmitted signal
Subclass 142.07: Routing an incoming call on multiple lines to a particular appliance (e.g., facsimile, computer, or telephone)
Subclass 142.08: Call waiting associated with caller ID information
Subclass 164: Line status indication or call alerting
Subclass 215.01: Call Waiting
Subclass 257: For calling station (e.g., status or progress tones)
Subclass 390.01: Amplification or attenuation level control

Class 704: Data Processing:Speech Signal Processing, Linguistics, Language Translation, And Audio Compression/Decompression

This is the generic class for apparatus and corresponding methods for constructing, analyzing, and modifying units of human language by data processing, in which there is a significant change in the data.This class also provides for systems or methods that process speech signals for storage, transmission, recognition, or synthesis of speech; and for systems or methods for bandwidth compression or expansion of an audio signal, or for time compression or expansion of an audio signal. There are three main divisions: linguistics; speech signal processing; and audio compression.

Subclass E19.01: Using spectral analysis, e.g., transform vocoders, subband vocoders, perceptual audio coders, psychoacoustically based lossy encoding, etc., e.g., MPEG audio, Dolby AC-3, etc. (EPO)