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An armor with rollers is provided that enables a user to move in all positions by rolling on a hard and smooth surface while constantly varying his bearing points on the ground.
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| Number | Title | Issue Date |
| 7539864 | Methods and portable device for digitally signing data Methods and device for digitally signing documents by using a portable device that encodes a signature string to sound. The acoustic signature string may be transmitted and then decoded back into digital data. The signature string may be further processed to verify ... | 05/26/2009 |
| 7231025 | Acoustic encoding of dynamic identification codes Methods for identifying a remote user of a portable device by using the portable device to encode sound corresponding to the identification of the remote user. The sound is received by a microphone external to the portable device and convened to an electrical signal... | 06/12/2007 |
| 7181621 | Methods and device for digitally signing data Methods and device for digitally signing documents by using a portable device that encodes a signature string to sound. The acoustic signature string may be transmitted and then decoded back into digital data. The signature string may be further processed to verify ... | 02/20/2007 |
| 6912659 | Methods and device for digitally signing data Methods and device for digitally signing documents (140) by using a portable device (110) that encodes a signature string to sound. The acoustic signature string may be transmitted and then decoded (150) back into digital data. The signature str... | 06/28/2005 |
