Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 5901738 | Portable fire hydrant An improved portable fire hydrant that can operate a water main valve disposed within a water main to produce water for fighting a fire by rotating a valve stem coupled to the water main valve includes an extension through which water can flow when the fi... | 05/11/1999 |
| 4307746 | Frost-proof fire hydrant A frost-proof fire hydrant of the type wherein the valve is biased towards its open position by the fluid pressure in the shoe. The fire hydrant includes improved means disposed in the bonnet and cooperating with the valve stem for maintaining the valve i... | 12/29/1981 |
