System for automatically plotting sensitometric control strip deviations

Claim 1

A SYSTEM FOR PLOTTING A DENSITY DEVIATION CURVE FOR A STEPPED PROCESS CONTROL TEST STRIP COMPRISING IN COMBINATION: A DENSITOMETER FOR SEPARATELY DETERMINING THE DENSITY OF EACH STEP OF A SERIES OF STEP FOR A PROCESS CONTROL TEST STRIP FED THERETO AND FOR PROVIDING A SERIES OF OUTPUT SIGNALS INDICATIVE OF THE DENSITIES OF SUCCESSIVE STEPS OF SAID TEST STRIP; A LOGARITHMIC CONVERTER UNIT CONNECTED WITH SAID DENSITOMETER FOR RECEIVING OUTPUT SIGNALS FROM SAID DENSITOMETER AND FOR PROVIDING A PLURALITY OF CONVERTER OUTPUT SIGNALS, EACH HAVING AN OPERATIVE POTENTIAL VALUE DICTATED BY AN OUTPUT SIGNAL PROVIDED FROM SAID DENSITOMETER; A CONVERTER-CONNECTED PLOTTING UNIT, INCLUDING A PLOTTING PEN AND DRIVE MEANS THEREFOR, FOR DISPLACING SAID PEN IN OPPOSED FIRST AND SECOND DIRECTIONS IN ACCORDANCE WITH THE OPERATIVE POTENTIAL VALUES OF THE CONVERTER OUTPUT SIGNALS RECEIVED FROM SAID CONVERTER UNIT; A CONTINUOUSLY DRIVEN TEST STRIP DRIVE UNIT OPERATIVELY CONNECTED WITH THE PLOTTING UNIT ADAPTED TO SEQUENTIALLY DISPLACE THE STEPS OF SAID TEST STRIP THROUGH SAID DENSITOMETER AND TO CONCURRENTLY DISPLACE THE PLOTTING PEN OF SAID PLOTTING UNIT IN A THIRD DIRECTION IN UNISON WITH THE DISPLACEMENT OF THE TEST STRIP FOR INDICATING TEST STRIP STEP DISPLACEMENT; A REFERENCE SIGNAL GENERATING COMPARATOR CIRCUIT CONNECTED BETWEEN THE LOGARITHMIC CONVERTER UNIT AND

Claim 2

A SYSTEM FOR PLOTTING A DENSITY DEVIATION CURVE FOR A STEPPED PROCESS CONTROL TEST STRIP COMPRISING IN COMBINATION: A DENSITOMETER FOR SEPARATELY DETERMINING THE DENSITY OF EACH STEP OF A SERIES OF STEP FOR A PROCESS CONTROL TEST STRIP FED THERETO AND FOR PROVIDING A SERIES OF OUTPUT SIGNALS INDICATIVE OF THE DENSITIES OF SUCCESSIVE STEPS OF SAID TEST STRIP; A LOGARITHMIC CONVERTER UNIT CONNECTED WITH SAID DENSITOMETER FOR RECEIVING OUTPUT SIGNALS FROM SAID DENSITOMETER AND FOR PROVIDING A PLURALITY OF CONVERTER OUTPUT SIGNALS, EACH HAVING AN OPERATIVE POTENTIAL VALUE DICTATED BY AN OUTPUT SIGNAL PROVIDED FROM SAID DENSITOMETER; A CONVERTER-CONNECTED PLOTTING UNIT, INCLUDING A PLOTTING PEN AND DRIVE MEANS THEREFOR, FOR DISPLACING SAID PEN IN OPPOSED FIRST AND SECOND DIRECTIONS IN ACCORDANCE WITH THE OPERATIVE POTENTIAL VALUES OF THE CONVERTER OUTPUT SIGNALS RECEIVED FROM SAID CONVERTER UNIT; A CONTINUOUSLY DRIVEN TEST STRIP DRIVE UNIT OPERATIVELY CONNECTED WITH THE PLOTTING UNIT ADAPTED TO SEQUENTIALLY DISPLACE THE STEPS OF SAID TEST STRIP THROUGH SAID DENSITOMETER AND TO CONCURRENTLY DISPLACE THE PLOTTING PEN OF SAID PLOTTING UNIT IN A THIRD DIRECTION IN UNISON WITH THE DISPLACEMENT OF THE TEST STRIP FOR INDICATING TEST STRIP STEP DISPLACEMENT; A REFERENCE SIGNAL GENERATING COMPARATOR CIRCUIT CONNECTED BETWEEN THE LOGARITHMIC CONVERTER UNIT AND