Did You Know...
...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 |
| 7380635 | Interference-based exhaust noise attenuation An interference-based exhaust noise attenuation device and method for exhaust flow from an internal combustion engine that generates compressive waves in the exhaust flow. The device includes at least a direct path for the exhaust flow; a looped path for the exhaust... | 06/03/2008 |
| D554726 | Golf pitch mark repair tool | 11/06/2007 |
| 7051829 | No-slip drive sprocket A drive sprocket for a snowmobile, a drive train using the sprocket, and a method of using the sprocket to drive a track for a snowmobile. The drive sprocket includes a round base, a plurality of convolute lugs on the base, and a plurality of involute lugs on both s... | 05/30/2006 |
