| Patent application number | Description | Published |
|---|
| 20080224618 | DISCHARGE LAMP HAVING A VISUAL-CHANGE TIMER - A discharge lamp having a visual-change timer is described. The visual-change timer is comprised of a ceramic material that provides an indication of the cumulative operating time of the lamp. The visual-change timer is expected be a help to consumers in avoiding unnecessary, premature, and costly lamp replacement and a help to lamp manufacturers in verifying the validity of warranty claims for replacement lamps. | 09-18-2008 |
| 20090066251 | Ceramic Discharge Vessel Having an Opaque Zone and Method of Making Same - An opaque zone in the polycrystalline (PCA) discharge vessel of a high intensity discharge lamp may be made by creating residual pores in predetermined regions of the final-sintered discharge vessel. The control over the placement of the opaque zone is achieved by forming a carbonaceous residue in a specific region of the discharge vessel prior to final sintering. During sintering, the carbonaceous material causes residual porosity in the sintered PCA. The higher emissivity of the opaque PCA provides localized cooling in order to provide more control over the condensate behavior in the discharge vessel. | 03-12-2009 |
| 20090069168 | Method of Converting PCA to Sapphire and Converted Article - Polycrystalline alumina (PCA) that has been doped with magnesium oxide is converted to sapphire by additionally doping the PCA with boron oxide and sintering to induce abnormal grain growth. The boron oxide may be added to an already formed green PCA ceramic shape by applying an aqueous boric acid solution to the green ceramic and heating the green ceramic in air to convert the boric acid to boron oxide. | 03-12-2009 |
| 20090079112 | Method of Sintering AlN Under a Methane-containing Nitrogen Atmosphere - The present method uses a methane-containing nitrogen gas sintering atmosphere to sinter aluminum nitride (AlN) to a high transmittance. The methane gas replaces the solid carbon charge material used in prior art sintering methods as the source of gaseous carbon. The amount of carbon in the methane-containing nitrogen gas is easily controlled by varying the partial pressure of methane in the nitrogen gas. In addition, the methane flow is stopped prior to the end of the sintering cycle to prevent darkening of the sintered part. | 03-26-2009 |
| 20090212704 | CERAMIC DISCHARGE VESSEL WITH CHROMIUM-COATED NIOBIUM FEEDTHROUGH AND DISCHARGE LAMP CONTAINING SAME - There is described a lamp having a ceramic discharge vessel with a niobium feedthrough that has been coated with a layer of chromium to provide oxidation resistance. In a preferred method, a slurry containing chromium powder is applied to the niobium feedthrough and dried. A sub-assembly is formed by inserting the coated niobium feedthrough into an annular polycrystalline alumina (PCA) disc and heated in vacuum to 1700° C. to 1900° C. to bond the feedthrough to the PCA and form the sub-assembly and an oxidation-resistant coating on the feedthrough. The sub-assembly is then sealed to a ceramic body of the discharge vessel in a conventional manner. | 08-27-2009 |
| 20090269523 | BRAZING ALLOY AND CERAMIC DISCHARGE LAMP EMPLOYING SAME - There is described a brazing alloy having a first component comprising a source of molybdenum and a source of aluminum and a second component comprising boron, wherein a weight ratio of said second component to said first component is not greater than 1:20. The addition of boron results a substantially lower melting point than alloys employing molybdenum and aluminum alone. It is suitable for use in discharge vessels having a hollow bodies selected from the group of monocrystalline alumina, polycrystalline alumina and aluminum nitride; metallic electrode holders fitted into ends of the hollow body; and sealed thereto by a braze. | 10-29-2009 |
| 20100134005 | SEALING COMPOSITION FOR SEALING ALUMINUM NITRIDE AND ALUMINUM OXYNITRIDE CERAMICS - There is described a sealing composition for sealing aluminum nitride and aluminum oxynitride ceramics comprising: a mixture of SiO | 06-03-2010 |
| 20110006677 | ARC TUBE WITH END STRUCTURE - An arc tube of ceramic material has an aluminum nitride (AlN) end structure ( | 01-13-2011 |
