Epoxy resin impregnation of electrical members

Claim 1

IN THE METHOD OF INSULATING AN ELECTRICAL MEMBER OF AN APPARATUS WHICH MEMBER HAS CURRENT CARRYING CONDUCTORS DISPOSED THEREON, THE STEPS COMPRISING PREHEATING SAID ELECTRICAL MEMBER AT A TEMPERATURE OF AT LEAST 100* C., THEN SUBJECTING THE ELECTRICAL MEMBER TO A VACUUM, THEN WITH THE ELECTRICAL SUBJECTING TO SAID VACUUM BELOW 20 MM., IMMERSING IT INTO A MIXTURE OF AN EPOXY RESIN AND A HARDENER, THAN SUBJECTING THE MIXTURE TO A PRESSURE OF AT LEAST 50 P.S.I., THEN REMOVING THE ELECTRICAL MEMBER FROM THE MIXTURE AND ROTATING IT ABOUT ITS CENTRAL AXIS AT A SPEED SUFFICIENTLY LOW TO AVOID THROWING OFF SAID MIXTURE ADHERING THERETO WHILE HEATING THE MEMBER TO A TEMPERATURE OF ABOUT 100-400*C. TO CURE THE EPOXY RESIN-HARDENER MIXTURE, SAID EPOXY RESIN BEING A BISPHENOL EPICHLOROHYDRIN POLYMER HAVING AN EPOXY EQUIVALENT OF ABOUT 180-205, SAID HARDENER EFFECTING CURING OF SAID EPOXY RESIN DURING HEATING OF THE MEMBER.