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Class Information
Number: 219/61.1
Name: Electric heating > Metal heating (e.g., resistance heating) > Of cylinders (e.g., pipes and tubes) > Having internal support means
Description: Subject matter including support means for the cylinder, positioned inside the cylinder during the welding process.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6621037 |
Welding material with conductive sheet and method |
Sep. 16, 2003 |
| 6566624 |
Welding assembly with nestable conductive ends |
May. 20, 2003 |
| 6119916 |
Internal backup ring system |
Sep. 19, 2000 |
| 6060678 |
Gas shield strip clad welding system |
May. 9, 2000 |
| 5609291 |
Expandable tool for holding and aligning pipes to be welded |
Mar. 11, 1997 |
| 5538173 |
Expandable tool for holding aligning pipes to be welded |
Jul. 23, 1996 |
| 4975556 |
Butt welding machine |
Dec. 4, 1990 |
| 4830258 |
Method and apparatus for producing a container body having a butt welded longitudinal seam from a sheet metal blank |
May. 16, 1989 |
| 4810848 |
Tube welder |
Mar. 7, 1989 |
| 4648544 |
Internal chuck for butt welding two tubes |
Mar. 10, 1987 |
| 4562326 |
Machine for welding automotive wheel rim blanks |
Dec. 31, 1985 |
| 4500764 |
Device for internal welding of pipes or the like |
Feb. 19, 1985 |
| 4490599 |
Apparatus for flash welding of pipes |
Dec. 25, 1984 |
| 4436974 |
Pipe resistance butt welding apparatus |
Mar. 13, 1984 |
| 4410781 |
Lap-seaming electrical resistance welding machine for can bodies |
Oct. 18, 1983 |
| 4326116 |
Apparatus for electric resistance heating and cooling tubular workpieces |
Apr. 20, 1982 |
| 4317003 |
High tensile multiple sheath cable |
Feb. 23, 1982 |
| 4310737 |
Pipe resistance butt welding apparatus |
Jan. 12, 1982 |
| 4187406 |
Machine for welding seams in automotive wheel rim blanks |
Feb. 5, 1980 |
| 4081649 |
Seam roller for tube mill |
Mar. 28, 1978 |
| 4072787 |
Laminated wall tubing |
Feb. 7, 1978 |
| 4012619 |
Machine for the resistance butt welding of pipes by fusion |
Mar. 15, 1977 |
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