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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 5522327 | Balanced pressure solid fuel heating unit A method and apparatus for a pellet fuel burning heating unit for burning corn or wood pellets having a balanced pressure system having a four-way split combustion intake airstream. The invention includes a combustion air blower system for providing combu... | 06/04/1996 |
| 5359945 | Balanced pressure solid fuel heating unit A method and apparatus for a pellet fuel burning heating unit for burning corn or wood pellets having a balanced pressure system having a four-way split combustion intake airstream. The invention includes a combustion air blower system for providing combu... | 11/01/1994 |
| 5297493 | Burn pot for particulate combustors The present invention relates to a burn pot for particulate combustors, particularly of the type used for burning particulate fuel such as pellets. The burn pot includes a burn pot body surrounded by an air plenum in which air is delivered and exhausted t... | 03/29/1994 |
| 4898106 | Combustion method and apparatus A method and apparatus for burning a combustible material in a closed container having an open top wherein a sheet of oxygen containing gas is forced into the burning chamber of such container, wherein, in forming the sheet of oxygen containing gas, a maj... | 02/06/1990 |
| 4874104 | Hot water storage tank A vertical hot water storage tank with an access opening in its underside, for positioning an internal heating element in the tank, and connectors for the supply of cold water to the tank and for the egress of hot water therefrom, is in the form of a pres... | 10/17/1989 |
| 4846112 | Fuel bath volume compensator for stored chemical energy power propulsion system An ullage compensator is disclosed for a stored chemical energy power propulsion system. With the invention, at least one movable wall (16) is provided within a reactor having a chamber (10) which is movable between a first position at which the chamber h... | 07/11/1989 |
