Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 7090142 | Hot air aggregate The invention relates to an arrangement in a hot air aggregate comprising a cover (2) having a built-in fan (3), an enclosed chamber (4) after said fan (3) which extends into a conically formed, front portion (5), to which a burner... | 08/15/2006 |
| 6929190 | Portable multi-purpose heating unit A multi-purpose heating unit is sized and configured to be used with a variety of attachments or devices to perform various functions such as heating, cooking and providing light. In particular, the multi-purpose heating unit includes a heat source which can be used... | 08/16/2005 |
| 6209795 | Camping apparatus for heating a portable habitation and method Camping apparatus for heating an interior of a portable habitation. The apparatus comprises an interior heater for heating the interior of the portable habitation. A heat transfer device uses fumes emitted by a fire to provide heated air. Transporting app... | 04/03/2001 |
| 4337619 | Hot water system A versatile hot water supply system incorporating a feedback control network and vapor generator of the kind in which a fuel air mixture is combusted in a chamber through which water is flowed. The vapor generator produces a low pressure steam which is pe... | 07/06/1982 |
