Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7831276 | Portable computing, communication and entertainment device with central processor carried in a detachable handset The present invention relates in general to portable processor based devices that provide computing, communication or entertainment functionality. More particularly, the present invention pertains to portable processor based devices operable while being held in its ... | 11/09/2010 |
| 7577462 | Portable data entry device with a detachable host PDA An apparatus and method are disclosed that can adapt off-the shelf PDA devices (90) to user input/output applications such as data entry applications and cellular phone applications. The resulting apparatus (10) may be sized and shaped to be durable an... | 08/18/2009 |
| 7149543 | Handheld computer with detachable communication device A handheld computing device (10) having voice input and voice output includes a handheld unit (20) having a processor (11) and a display (18) communicating with the processor (11), a communication device (30) including means... | 12/12/2006 |
| 7120462 | Portable computing, communication and entertainment device with central processor carried in a detachable handset The present invention relates in general to portable processor based devices that provide computing, communication or entertainment functionality. More particularly, the present invention pertains to portable processor based devices operable while being held in its ... | 10/10/2006 |
| 6952617 | Handheld computer with detachable handset A handheld computing device (10) having voice input and voice output includes a handheld unit (20) having a processor (11) and a display (18) communicating with the processor (11), a handset (30) including means for voice in... | 10/04/2005 |
