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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Application No. | Application Title | Issue Date |
| 20120038840 | OPTICAL SHUTTERING DEVICE BASED ON LIQUID CRYSTALS WITH ATTENUATION OF SWITCHING NOISES OF SAID LIQUID CRYSTALS, CORRESPONDING VIEWING GOGGLES AND DISPLAY DEVICE An optical shuttering device is provided, which includes an optical cell with a liquid crystal material between first and second transparent substrates and controlled by an electronic switching circuit. The switching circuit includes a power supply module, providing a c... | 02/16/2012 |
