Inventor
UDALL HUMFREY N
12 patents
Patents
12 patentsUS4278868AJul 14, 1981
Methods and apparatus for heating metal parts with magnetically driven travelling electric arc
THERMATOOL CORP21 citations81
US4916278AApr 10, 1990
Severing metal strip with high frequency electrical current
THERMATOOL CORP16 citations73
US4234776ANov 18, 1980
Method of producing areas of alloy metal on a metal part using electric currents
THERMATOOL CORP16 citations73
US4219722AAug 26, 1980
Methods and apparatus for heating metal parts with magnetically driven travelling electric arc
THERMATOOL CORP11 citations73
US4215259AJul 29, 1980
Surface hardening of metals using electric currents
THERMATOOL CORP12 citations73
US4081648AMar 28, 1978
High frequency in-line, electrical welding apparatus for small diameter metal tubing
THERMATOOL CORP8 citations73
US4845326AJul 4, 1989
Apparatus and method for electrically butt welding of skelp edge faces which have been preheated
THERMATOOL CORP12 citations71
US4241284ADec 23, 1980
Electrical contact apparatus for high frequency welding
THERMATOOL CORP5 citations62
US4233484ANov 11, 1980
High frequency current welding of metal strip to a metal part
THERMATOOL CORP5 citations61
US4339654AJul 13, 1982
Methods for the manufacture of heat exchanger panels
THERMATOOL CORP4 citations59
US4277871AJul 14, 1981
Heat exchanger panels and method of manufacture
THERMATOOL CORP1 citations51
US4287947ASep 8, 1981
Solar panel elements and method of manufacture thereof
THERMATOOL CORP0 citations37