Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 7938597 | Subsurface drainage system and drain structure therefor A subsurface drainage assembly for directing fluid drainage from a surface is disclosed. The subsurface drainage assembly includes a plurality of drain structure panels linked together in a manner that permits movement of one drain structure panel relative to the ad... | 05/10/2011 |
| 7578635 | Subsurface drainage system and method of installing the same A subsurface drainage assembly for directing fluid drainage from a surface is disclosed. The subsurface drainage assembly includes a plurality of drain structure panels linked together in a manner that permits movement of one drain structure panel relative to the ad... | 08/25/2009 |
| 7341401 | Subsurface drainage system and drain structure therefor A subsurface drainage assembly for directing fluid drainage from a surface. The subsurface drainage assembly includes a plurality of drain structure panels linked together in a manner that permits movement of one drain structure panel relative to the adjacent drain ... | 03/11/2008 |
| 7290958 | Subsurface drainage system and drain structure therefor A subsurface drainage assembly for directing fluid drainage from a surface is disclosed. The subsurface drainage assembly includes a plurality of drain structure panels linked together in a manner that permits movement of one drain structure panel relative to the ad... | 11/06/2007 |
| 7201538 | Subsurface drainage system and drain structure therefor A subsurface drainage assembly for directing fluid drainage from a surface is disclosed. The subsurface drainage assembly includes a plurality of drain structure panels linked together in a manner that permits movement of one drain structure panel relative to the ad... | 04/10/2007 |
| 7108454 | Subsurface drainage system and drain structure therefor A subsurface drainage assembly for directing fluid drainage from a surface including a plurality of drain structure panels linked together in a manner that permits movement of one drain structure panel relative to the adjacent drain structure panel. The drain struct... | 09/19/2006 |
