Patent ID: 6497773
Filing Date: 2002-12-24
Classification: A42B,A63B,B21F,B21K,C22F

Abstract:
A method of manufacturing a mask for a team game comprised of the following steps:(a) Heating an aluminum alloy containing copper and molybdenum at a temperature between 410Â° C. to 430Â° C. for three hours; (b) Cooling the alloy at a rate of about 30Â° C. per hour; (c) Cutting the alloy into a plurality of straight or curved bars; (d) Heating the bars at a temperature between 450Â° C. to 550Â° C. for one and one half hours; (e) Quenching the bars in water after seven seconds have passed; (f) Heating the bars at temperature between 100Â° C. to 150Â° C. for 18 hours; (g) Cooling in air; (h) Forming an unfinished mask by resistance brazing; and (i) Treating the unfinished mask to produce a finished mask by anodizing.