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"The abolishment of pain in surgery is a chimera. It is absurd to go on seeking it...knife and pain are two words in surgery that must forever be associated in the consciousness of the patient."
Dr. Alfred Velpeau, French surgeon ; 1839
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| Number | Title | Issue Date |
| 5955735 | Apparatus and method for positively identifying synthetic silicon carbide gemstones A target gemstone is irradiated with ultraviolet energy while sensing the electrical potential across the gemstone. A silicon carbide gemstone will generate an electrical potential and, therefore, can be positively identified, as distinct from other gemst... | 09/21/1999 |
| 5882786 | Gemstones formed of silicon carbide with diamond coating Synthetic gemstones are produced by growing single crystals of silicon carbide, fashioning the silicon carbide into gemstone cores, and thereafter depositing a thin coating of diamond on the core.... | 03/16/1999 |
| 5835205 | Optical testing system for distinguishing a silicon carbide gemstone from a diamond Diamond gemstones and gemstones formed of crystals of silicon carbide are distinguished from each other by introducing a band of ultraviolet light into a target gemstone and measuring the transmissivity of that band of light by the gemstone. A diamond wil... | 11/10/1998 |
| 5762896 | Silicon carbide gemstones Synthetic gemstones having extraordinary brilliance and hardness are formed from large single crystals of relatively low impurity, translucent silicon carbide of a single polytype that are grown in a furnace sublimation system. The crystals are cut into r... | 06/09/1998 |
| 5723391 | Silicon carbide gemstones Synthetic gemstones having extraordinary brilliance and hardness are formed from large single crystals of relatively low impurity, translucent silicon carbide of a single polytype that are grown in a furnace sublimation system. The crystals are cut into r... | 03/03/1998 |
