V.42bis Data Compression for MODEMS

This invention was stolen by British Telecom to develop the V.42bis modem standard

Demonstration: 1985

Abstract: A method for lossless data compression and encryption was first disclosed in 1977 in a patent application (Patent 4 366 551) and a paper presented at the FIRST WEST COAST COMPUTER FAIRE in San Francisco. In 1985 a hardware demonstration system was build in Germany and a paper was presented at the GLOBECOM’85 convention in New Orleans. Test results were very promising but work in Germany was abandoned in 1987. Meanwhile a group of researchers working for British Telecom developed a more primitive dynamic data compression method to be adopted in 1990 as the International V.42bis data compression standard for modems. Klaus Holtz, the inventor, was not mentioned or invited for the negotiations and British Telecom denies patent infringement. About 15 companies recognized the Holtz patent and paid for a license, The Holtz method is superior for providing higher data compression with unbreakable encryption, based on a new Autosophy information theory.

Available downloadable documents:

V.42bis Introduction – MS Word doc

V.42bis Patent infringement analysis – MS Word – doc

Improving the V.42bis standard – Webpage mht

A NAVY Phase II proposal 1985 – MS Word -- doc

Presentation slides of hardware module 1985 – pdf

V.42bis Modem Enhancer Demonstration Picture -- pdf

First Publication Learning Networks 1977 – Webpage htm

Patent 1982 – Webpage htm

Data compression paper 1985 – Webpage htm

Tutorial 1995 – Webpage htm