Liquid indicator with moisture indication means

Claim 1

IN A LIQUID INDICATOR FOR USE IN REFRIGERANT FLOW LINES, SAID INDICATOR INCLUDING A TUBULAR TRANSPARENT WINDOW PORTION WHICH IS RADIALLY OFFSET RELATIVE TO AN AXIALLY EXTENDING LIQUID REFRIGERANT FLOW PASSAGE AND IN COMMUNICATION THEREWITH, THE PROVISIONS OF REFRIGERANT MOISTURE INDICATION MEANS IN SAID TUBULAR PORTION AND COMPRISING A RETAINER HAVING A MATERIAL CARRYING PORTION HELD IN OBSERVABLE ASSOCIATION WITH THE INNER SURFACE OF A REMOVABLE WINDOW MEMBER MOUNTED IN SAID TUBULAR PORTION, AND RETAINER COMPRISING A GENERALLY FLAT CENTRAL PORTION SUPPORTED BY LEG MEANS FORMED FROM RESILIENT MATERIAL AND ENGAFED WITH AN ANNULAR SUPPORT SURFACE FORMING A PART OF SAID TUBULAR PORTION SaID LEG MEANS BEING INTEGRALLY FORMED WITH SAID CENTRAL PORTION AND BEING RADIALLY DIRECTED THEREFROM aND IN TENSION TO HOLD THE OUTER SURFACE OF SAID CENTRAL PORTION IN ENGAGEMENT WITH THE INNER SURFACE OF SAID WINDOW MEMBER, SAID CENTRAL PORTION HAVING MOUNTED THEREON SUPEREMPOSED LAYERS OF MOISTURE SENSITIVE MATERIAL AND MOISTURE INSENSITIVE MATERIAL, THE OUTERMOST OF SAID LAYERS HAVING FORMED THEREIN IN STENCIL-LIKE MANNER A WORD INSTRUCTION WHICH IS OBSERVABLE BASED ON THE MOISTURE CONTENT OF THE LIQUID REFRIGERANT IN CONTACT WITH SAID LAYER OF MOISTURE SENSITIVE MATERIAL, SAID LAYER OF MOISTURE INSENSITIVE MATERIAL BEING OF A FIXED COLOR WHILE SAID LAYER OF MOISTURE SENSITIVE MATERIAL IS OF CHANGABLE COLOR TO PROVIDE FOR INSTRUCTION APPEARANCE UPON THE ATTAINING OF A PREDETERMINED MOISTURE CONTENT IN SAID REFRIGERANT, SAID CENTRAL PORTION OF SAID RETAINER BEING APERTURED FOR LIIQUID REFRIGERANT CONTACT WITH SAID LAYERS, SAID RETAINER BEING SILIENTLY HELD BETWEEN SAID WINDOW MEMBER AND SAID ANNULAR SUPPORT SURFACE BY SAID LEG MEANS AND FULLY CONTAINED IN SAID TUBULAR PORTION FOR READY REMOVAL THEREFROM REMOVAL OF SAID WINDOW MEMBER.