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 |
| 7422790 | Methods of processing nanocrystals, and compositions, devices and systems including same Methods of processing nanocrystals to remove excess free and bound organic material and particularly surfactants used during the synthesis process, and resulting nanocrystal compositions, devices and systems that are physically, electrically and chemically integrata... | 09/09/2008 |
| 7394091 | Composite nano-particle and method for preparing the same There is provided composite nano-particles comprising nano-crystal particles dispersed stably and individually in suspension in high concentration without mutual aggregation of the nano-particles. A determined amount of pure water or deionized water is poured into a... | 07/01/2008 |
| 7381465 | Core-shell structure having controlled cavity inside and structure comprising the core-shell structure as component, and method for preparation thereof A core-shell structure comprises a core (2) comprising nanoparticles and a shell (4) coating the core (2), and its void space (3) formed by the core (2) and the shell (4) is controlled. A method of preparing the core-shell s... | 06/03/2008 |
| 7374824 | Core-shell nanocrystallite comprising tellurium-containing nanocrystalline core and semiconductor shell Tellurium-containing nanocrystallites are produced by injection of a precursor into a hot coordinating solvent, followed by controlled growth and annealing. Nanocrystallites may include CdTe, ZnTe, MgTe, HgTe, or alloys thereof. The nanocrystallites can photolumines... | 05/20/2008 |
| 7326365 | Composite material including nanocrystals and methods of making Temperature-sensing compositions can include an inorganic material, such as a semiconductor nanocrystal. The nanocrystal can be a dependable and accurate indicator of temperature. The intensity of emission of the nanocrystal varies with temperature and can be highly... | 02/05/2008 |
| 7318957 | Organic material-coated semiconductor nanoparticle with excellent durability, and method of manufacturing the same The resistance of a semiconductor nanoparticle provided with a surface treatment, such as an OH coating or ammonia treatment, against external factors is improved. A semiconductor nanoparticle provided with a surface treatment such as an OH coating or ammonia treatm... | 01/15/2008 |
| 7297323 | Method and apparatus for manufacturing fine particles A method of manufacturing fine particles of the invention includes introducing a reactive gas flow containing a fine particle source material into a reactor from one side, growing fine particles in a gas phase by heating the fine particle source material in the reac... | 11/20/2007 |
| 7267810 | Method of synthesizing colloidal nanocrystals A method of making nanocrystals involves adding a chalocogen source to a hot solution of a metal-containing non-organometallic compound, such as CdO, in a first ligand solvent, such as TOP, and preferably subsequently cooling the resulting mixture to a lower tempera... | 09/11/2007 |
| 7235190 | Nanocluster-based white-light-emitting material employing surface tuning A method for making a nanocrystal-based material capable of emitting light over a sufficiently broad spectral range to appear white. Surface-modifying ligands are used to shift and broaden the emission of semiconductor nanocrystals to produce nanoparticle-based mate... | 06/26/2007 |
| 7138098 | Preparation of nanocrystallites A method of manufacturing a nanocrystallite from a M-containing salt forms a nanocrystallite. The nanocrystallite can be a member of a population of nanocrystallites having a narrow size distribution and can include one or more semiconductor materials. Semiconductin... | 11/21/2006 |