Method for estimating quickly the neutralization number of automatic transmission fluid

Claim 1

A METHOD OF PROTECTING AUTOMATIC TRANSMISSIONS BY DETECTING THE PRESENCE OF DETRIMENTAL AMOUNTS OF ACID IN USED AUTOMATIC TRANSMISSION FLUID WHICH COMPRISES FORMING A COLOR TEST SOLUTION FROM A HYDROXIDE, AN ALCOHOL, AND AROMATIC HYDROCARBON, WATER, AND AN ORGANIC ACID-BASE INDICATOR WHICH IN SAID SOLUTION WILL CHANGE ITS COLOR FROM BLUE TO REDDISH-ORANGE AS THE ACIDITY OF THE SOLUTION INCREASES AND WILL PROVIDE A SHARP COLOR CHANGE FROM GREEN TO YELLOW WHEN A USED AUTOMATIC TRANSMISSION FLUID HAS A NEUTRALIZATION NUMBER OF FROM ABOUT 2 TO ABOUT 7, SAID SOLUTION CONTAINING SUFFICIENT QUANTITY OF SAID HYDROXIDE TO BE EQUIVALENT TO THE NUMBER OF MILLIGRAMS OF POSTASSIUM HYDROXIDE PER MILLILITER OF SOLUTION NECESSARY TO OBTAIN THE NEUTRALIZATION NUMBER, AND INTRODUCING THE SAID FLUID INTO SAID SOLUTION IN SUCH PROPORTIONS THAT A SHARP COLOR CHANGE WILL INDICATED THEAT THE FLUID IS DETRIMENTAL TO THE LIFE OF THE TRANSMISSION AND SHOULD BE CHANGED.