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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 |
| 8121466 | Deicer anchoring system A system for preventing a deicer from being removed from a liquid receptacle includes a deicer, an anchoring assembly and a tether. The deicer includes a main body and a heating element. The heating element is configured to heat liquid within the liquid receptacle. ... | 02/21/2012 |
| 7941040 | Systems and methods for smart deicers Certain embodiments of the present invention provide a deicer system for heating water within a fluid receptacle to prevent ice from forming, the system including a main body configured to be positioned within the fluid receptacle, a heating element adapted to heat ... | 05/10/2011 |
| 7917019 | Systems and methods for temperature sensing in a deicer Certain embodiments of the present invention provide a deicer system for heating water within a fluid receptacle to prevent ice from forming including a main body configured to be positioned within the fluid receptacle, a heating element adapted to heat the water, a... | 03/29/2011 |
| 7853133 | Deicing system and method A deicing system configured to heat water within a water receptacle includes a main body supporting a temperature sensor, a heating element, and a pump. The main body is positioned proximate a base of the water receptacle. The temperature sensor is configured to det... | 12/14/2010 |
| 7355147 | Ice removal for a pond A floating ice removal device with a disk shaped upper cover, a disk shaped lower cover and a heat emitting cup. An electric circuit board is mounted on an inner bottom of the lower cover, and a helical heat emitting wire is mounted on the inner top surface of the u... | 04/08/2008 |
| 7241974 | System and method of deactivating a fluid receptacle deicer A deicing system configured to heat fluid within a fluid receptacle to prevent ice from forming includes a sensing unit and a heating element. The sensing unit is configured to detect a change in at least one of capacitance and resistivity. The heating element is co... | 07/10/2007 |
| 6970645 | Pond heater with water pump A pond heater with a water pump, the housing of the heater is provided with a holed seat for receiving the water pump; cold water enters the pond heater via a water inlet, and hot water generated by the heater is discharged from a water outlet to create convection i... | 11/29/2005 |
| 6778763 | Floating water deicer A water deicer for maintaining an opening in a body of water that would otherwise freeze over with ice, includes a water pump having an inlet and an outlet, and a heater. The heater is constructed and positioned to deliver heat to the body of water at or near the wa... | 08/17/2004 |
| 6597863 | Device for keeping a portion of a body of water free from ice A device for keeping a portion of a body of water free from ice includes a heating element and a buoyant enclosure to contain the heating element.... | 07/22/2003 |
| 5933575 | Water heating appliance for hottub or spa A water heating appliance for use in a hottub or spa with said appliance consisting of an especially designed float-body with a safety shield which protrudes from the bottom of the body and also acts as a heating chamber, with an especially designed float... | 08/03/1999 |
| 5235161 | Detachable metallic safety guard for portable electric immersion heater A detachable metallic safety guard for use with a portable electric immersion heater is formed as an endless metallic band defining an open central area for receiving the heating element of the heater with the inner periphery of the band in spaced surroun... | 08/10/1993 |
| 4835366 | Portable temperature controlled floating electric immersion heater for a livestock water tank A floating electric water heater for heating livestock watering tanks which maintains the watering tank substantially ice free during low temperatures, thereby providing access to water by a plurality of animals. More particularly, the heater includes a h... | 05/30/1989 |
| 4815440 | Apparatus for heating a bath An apparatus for heating a bath comprises a cover whose underneath surface is intended to come into contact with the surface of the bath and comprises at least one passage which is open towards the bath. A heating means is operable in the passage thereby ... | 03/28/1989 |
| 4272672 | Aquarium heater An immersible, floatable aquarium heater is provided, with universal mounting bracket which will accommodate both the old and new types of aquarium construction. The heater includes a sealing cap incorporating integrally the control knob spindle and the p... | 06/09/1981 |
