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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 |
| 20100236861 | DIAPHRAGM OF ELECTRO-ACOUSTIC TRANSDUCER A diaphragm of an electro-acoustic transducer is provided. The diaphragm of the electro-acoustic transducer includes a central portion and a peripheral portion. The rigidity of the central portion is greater than the peripheral portion, such that the diaphragm has diffe... | 09/23/2010 |
| 20100044147 | MICROELECTROMECHANICAL SYSTEM DIAPHRAGM AND FABRICATING METHOD THEREOF A microelectromechanical system diaphragm is provided. The microelectromechanical system diaphragm includes a substrate, a first conductive layer, a second conductive layer, a first dielectric layer, and a second dielectric layer. The first conductive layer is disposed ... | 02/25/2010 |
