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 |
| 7154394 | Hidden security device and container using the same A hidden security device for a container of cargo transportation includes a case provided with an electronic processing unit; a tightly-seized device, including a plate, extending from the case, on which a displacement sensor communicating with the electronic proces... | 12/26/2006 |
| 4539555 | Fire and smoke protection device for use in buildings An anti-security control for unlocking the normally locked door which separates the corridor side and the stairwell side of buildings, such as hotels. The anti-security control is preferably adapted for use with and draws power from any conventional-type ... | 09/03/1985 |
