Method of making impurity-type semi-conductor electrical contacts

Claim 1

A METHOD OF MAKING AN IMPURITY-TYPE SEMICONDUCTOR ELECTRICAL CONTACT BRUSH, COMPRISING: (A) MIXING FROM 15 TO 99 PERCENT BY VOLUME OF POWDERED MOLYBDENUM DISULPHIDE WITH FROM 1 TO 85 PERCENT BY VOLUME OF A POWDERED METAL SELECTED FROM A GROUP OF COPPER, SILVER, AND MIXTURES THEREOF; (B) PLACING SAID MIXTURE IN A MOLD; (C) COMPACTING SAID MIXTURE BY PRESSURE APPLIED IN ONE DIRECTION AT APPROXIMATELY 3500 POUNDS PER SQUARE INCH; (D) FIRING SAID MIXTURE AT A SUFFICIENTLY HIGH TEMPERATURE AND FOR A PERIOD OF TIME TO CONVERT SAID MIXTURE INTO A SINTERED BLOCK OF OVERLY DOPED ANISOTROPIC MOLYBDENUM DISULPHIDE; (E) REMOVING SAID BLOCK FROM SAID MOLD FOR COOLING TO AMBIENT TEMPERATURE; (F) SHAPING SAID BLOCK INTO THE DESIRED FORM OF AN ELECTRICAL CONTACT BRUSH SO THAT ITS PLANE OF LAMINATIONS ARE SUBSTANTIALLY PERPENDICULAR TO AND HAVE A MAXIMUM WIDTH ALONG THESURFACE TO BE CONTACTED BY SAID BRUSH; (G) PASSIG AN ELECTRICAL CURRENT THROUGH SAID BLOCK OF SUFFICIENT STRENGTH TO PRODUCT A TEMPERATURE RISE OF FROM 80 TO 100 DEGREES CENTIGRADE; AND (H) REMOVING SAID ELECTRICAL CURRENT AND ALLOWONG SAID BLOCK TO COOL TO AMBIENT TEMPERATURE THEREBY PRODUCING A LATTIC REORIENTATION DUE TO INTRINSIC HEATING AND THEREBY LOWERING THE SPECIFIC RESISTIVITY OF SAID BRUSH.

Claim 2

A METHOD OF MAKING AN IMPURITY-TYPE SEMICONDUCTOR ELECTRICAL CONTACT BRUSH, COMPRISING: (A) MIXING FROM 15 TO 99 PERCENT BY VOLUME OF POWDERED MOLYBDENUM DISULPHIDE WITH FROM 1 TO 85 PERCENT BY VOLUME OF A POWDERED METAL SELECTED FROM A GROUP OF COPPER, SILVER, AND MIXTURES THEREOF; (B) PLACING SAID MIXTURE IN A MOLD; (C) COMPACTING SAID MIXTURE BY PRESSURE APPLIED IN ONE DIRECTION AT APPROXIMATELY 3500 POUNDS PER SQUARE INCH; (D) FIRING SAID MIXTURE AT A SUFFICIENTLY HIGH TEMPERATURE AND FOR A PERIOD OF TIME TO CONVERT SAID MIXTURE INTO A SINTERED BLOCK OF OVERLY DOPED ANISOTROPIC MOLYBDENUM DISULPHIDE; (E) REMOVING SAID BLOCK FROM SAID MOLD FOR COOLING TO AMBIENT TEMPERATURE; (F) SHAPING SAID BLOCK INTO THE DESIRED FORM OF AN ELECTRICAL CONTACT BRUSH SO THAT ITS PLANE OF LAMINATIONS ARE SUBSTANTIALLY PERPENDICULAR TO AND HAVE A MAXIMUM WIDTH ALONG THESURFACE TO BE CONTACTED BY SAID BRUSH; (G) PASSIG AN ELECTRICAL CURRENT THROUGH SAID BLOCK OF SUFFICIENT STRENGTH TO PRODUCT A TEMPERATURE RISE OF FROM 80 TO 100 DEGREES CENTIGRADE; AND (H) REMOVING SAID ELECTRICAL CURRENT AND ALLOWONG SAID BLOCK TO COOL TO AMBIENT TEMPERATURE THEREBY PRODUCING A LATTIC REORIENTATION DUE TO INTRINSIC HEATING AND THEREBY LOWERING THE SPECIFIC RESISTIVITY OF SAID BRUSH.