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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 |
| 7733208 | High voltage pulse type transformer with increased coupling coefficient through primary and secondary winding proximity The present invention provides a high voltage, step-up, high current DC pulse type transformer with increased coupling coefficient between the primary and secondary windings through close proximity of the primary winding turns and secondary winding turns by means of... | 06/08/2010 |
| 7543406 | Anti-false tripping escape-proof single-catch animal trap A single use, reusable or disposable, animal trap suitable for trapping rodents, having a stable enclosure, an unstable internal floor that tilts to dose the trap, a locking mechanism to keep trap closed, and a release for said locking mechanism, where both the lock... | 06/09/2009 |
| 7191735 | Electric animal deterrent for contact with underlying ground system The present invention provides a high voltage pulse generator used for deterring animals where the high voltage pulses are delivered to the animal through an electrical conductor that lays directly on the ground and is not insulated from the underlying ground system... | 03/20/2007 |
| 7148779 | Pulse type transformer with increased coupling coefficient through configuration of plural primary windings The present invention provides a low duty cycle, high current DC pulse type transformer with increased coupling coefficient between the primary and secondary windings by changing the proximity of the primary windings to the secondary windings through a plurality of ... | 12/12/2006 |
| 6948452 | Electric animal deterrent for contact with underlying ground system The present invention provides a high voltage pulse generator used for deterring animals where the high voltage pulses are delivered to the animal through an electrical conductor that lays directly on the ground and is not insulated from the underlying ground system... | 09/27/2005 |
| 6822549 | Method for increased coupling coefficient in a pulse type transformer through coil configuration and varied core area The present invention provides a high peak current, low duty cycle, pulse type transformer with two methods of increasing the coupling coefficient between the primary and secondary windings. The first method provides an increased coupling coefficient for a pulse typ... | 11/23/2004 |
