US PATENT SUBCLASS 237 / 59
.~ Circulation
Current as of: June, 1999
Click HD for Main Headings
Click for All Classes
| 237 / | HD | HEATING SYSTEMS |
|
| 56 | DF | WATER {5} |
| 59 |  | .~ Circulation {4} |
| 60 | DF | .~.~> Geyser boiler |
| 61 | DF | .~.~> Auxiliary boiler |
| 62 | DF | .~.~> Boiler loop |
| 63 | DF | .~.~> Pump {1} |
DEFINITION
Classification: 237/59
(under subclass 56) Water heating systems having special means for circulating the heating liquid.
SEE OR SEARCH CLASS
138, Pipes and Tubular Conduits,
37+, for fittings and pipes of general utility having means therein to direct the flow of fluid therein and even though intended to be used in a heating system.