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3731738
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Information
Patent Grant
3731738
References
Source
Patent Number
3,731,738
Date Filed
Not available
Date Issued
Tuesday, May 8, 1973
52 years ago
CPC
F28F21/082 - from steel or ferrous alloys
F28F1/12 - the means being only outside the tubular element
Y10S165/528 - Fin and conduit of diverse materials
Y10T428/12333 - Helical or with helical component
Y10T428/12458 - having composition, density, or hardness gradient
Y10T428/12965 - Both containing 0.01-1.7% carbon [i.e., steel]
US Classifications
165 - Heat exchange
122 - Liquid heaters and vaporizers
428 - Stock material or miscellaneous articles
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