William F. Semple, a dentist, was awarded the first US Patent on chewing gum in 1869. His recipe contained powdered chalk.
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| Number | Title | Issue Date |
| 8137742 | Heat stabilized sub-stoichiometric dielectrics A sub-stoichiometric oxide, nitride or oxynitride layer in an optical stack, alone or in direct contact with one or two stabilizing layers, stabilizes the optical properties of the stack. The stabilizing layer(s) can stabilize the chemistry and optical properties of... | 03/20/2012 |
| 7993744 | Heat stabilized sub-stoichiometric dielectrics A sub-stoichiometric oxide, nitride or oxynitride layer in an optical stack, alone or in direct contact with one or two stabilizing layers, stabilizes the optical properties of the stack. The stabilizing layer(s) can stabilize the chemistry and optical properties of... | 08/09/2011 |
| 7883776 | Protective layers for optical coatings An optical coating on a transparent substrate is provided with a temporary layer of carbon as protection during manufacturing against scratches and corrosive environments. When the optical coating and/or substrate are tempered in an atmosphere reactive to carbon, su... | 02/08/2011 |
| 7632572 | Double silver low-emissivity and solar control coatings A low-emissivity multilayer coating includes, in order outward from the substrate, a first layer including a layer containing titanium oxide, a layer containing silicon nitride, or a sublayer layer containing titanium oxide in combination with a sublayer containing ... | 12/15/2009 |
| 7548317 | Apparatus and method for angular colorimetry An apparatus for measuring the reflectance properties of an object having a front reflecting surface and at least one back reflecting surface. The apparatus includes a sample stage for placement of the object, a light source, a detector configured to detect reflecte... | 06/16/2009 |
| 7507478 | Heat stabilized sub-stoichiometric dielectrics A sub-stoichiometric oxide, nitride or oxynitride layer in an optical stack, alone or in direct contact with one or two stabilizing layers, stabilizes the optical properties of the stack. The stabilizing layer(s) can stabilize the chemistry and optical properties of... | 03/24/2009 |