Method of producing a double-walled tube with one of the tubes having integral therewith projecting fin means radially separating the tubes
United States Patent 3173196
US Patent References:
/0167688.html
- - 0167688

/0813918.html
- - 0813918

/0904189.html
- - 0904189

Method of forming golf shafts and the like
- - 2001643

Method of making a tubular article
- - 2132565


Inventors:
Grimm, Donald F.
Publication Date:
03/16/1965
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Assignee:
Fromson H. A.
Primary Class:
29/890.036
Other Classes:
138/109, 29/455.100, 138/112, 29/890.049, 165/179, 165/154, 72/370.180, 138/148, 138/114, 72/368, 29/523, 29/421.100
International Classes:
B21C37/14; F16L9/18; B21C37/06
US Patent References:
2611585Heat exchanger
2633414Protective liner for autoclaves
2643027Uniformly collapsible tube
2780000Method of thickening tube wall
Foreign References:
GB190585A