System for facsimile transmission over telephone lines

Claim 1

A FACSIMILE SYSTEM FOR PRODUCING A COPY OF AN ORIGINAL DOCUMENT AT A DISTANCE FROM THE FACSIMILE SYSTEM BY UTILIZING COMMERCIAL TELEPHONE TRANSMISSION FACILITIES, INCLUDING: READING MEANS FOR PRODUCING AN ELECTRICAL SIGNAL HAVING AMPLITUDE CHARACTERISTICS REPRESENTATIVE OF THE CONTENTS OF THE ORIGINAL DOCUMENT; MEANS ELECTRICALLY CONNECTED TO THE READING MEANS FOR FREQUENCY MODULATING THE ELECTRICAL SIGNAL FROM THE READING MEANS TO PRODUCE AN ELECTRICAL SIGNAL HAVING RECTANGULAR CHARACTERISTICS AND HAVING AUDIO FREQUENCIES IN A PARTICULAR RANGE; SENDING MEANS ELECTRICALLY CONNECTED TO THE FREQUENCY MODULATING MEANS FOR PASSING THE FREQUENCY MODULATED SIGNAL WITH RECTANGULAR CHARACTERISTICS INTO THE COMMERCIAL TELEPHONE TRANSMISSION FACILITIES; RECEIVING MEANS REMOTELY LOCATED FROM THE SENDING MEANS FOR RECEIVING THE FREQUENCY MODULATED SIGNALS WITH THE RECTANGULAR CHARACTERISTICS FROM THE COMMERCIAL TELEPHONE TRANSMISSION FACILITIES;