| Patent Number |
Title Of Patent |
Date Issued |
| 4479074 |
High intensity vapor discharge lamp with sintering aids for electrode emission materials |
October 23, 1984 |
| Sintering aids are disclosed which improve the sintering of emission materials in high pressure discharge lamps. The sintering aid is Nb.sub.2 O.sub.5 or Ta.sub.2 O.sub.5 or a mixture thereof along with an alkaline earth oxide with is mixed in the amount of 2 to 15 weight percent sin |
| 4475065 |
Method of operating HID sodium lamp to minimize lamp voltage variation throughout lamp life |
October 2, 1984 |
| High-pressure-sodium HID lamps characteristically display an increasing operating voltage throughout life. The industry has established operating standards as a trapezoidal figure on a graph wherein lamp wattage is plotted on the axis of ordinates and lamp voltage is plotted on the axis |
| 4435669 |
Arc tube construction |
March 6, 1984 |
| An arc tube for a high-pressure sodium (HPS) discharge lamp having an extended seal path to reduce leakage therethrough. The extended seal path is provided by a monolithic arc tube body having circular apertures in the ends thereof of a substantially smaller diameter than the diameter of |
| 4321503 |
HID Lamp electrode comprising barium-calcium niobate or tantalate |
March 23, 1982 |
| For HID lamps, and particularly high-pressure mercury or sodium-mercury HID lamps, the electron-emissive material portion of the lamp electrodes is Ba.sub.3 CaM.sub.2 O.sub.9 wherein M is niobium, tantalum or any combinations thereof. The specified material is highly emissive, very r |
| 4291250 |
Arc discharge tube end seal |
September 22, 1981 |
| An improved arc tube end seal and the method of forming that seal in a high pressure sodium discharge lamp is disclosed. The method includes precoating the refractory metal end cap with a slurry of a mixture of refractory metal powder and powdered metallic silicon and baking the end |
