Process for producing lamps
Abstract
Abstract Lamps operating at high temperatures, and more particularly incandescent or arc lamps having sealed-in lead-in electrical conductors with improved service characteristics and longer service life are fabricated with a ''''coating'''' on the aforesaid leads comprising at least one of the following: a phosphate or phosphide of tungsten, or a phosphate or phosphide of molybdenum. Illustrative of the results obtained upon service testing 400-W, 120-V quartz-iodine lamps, at operating temperatures of 500*600* C., using A. untreated, uncoated, molybdenum electrode assemblies, B. platinum-clad, molybdenum electrode assemblies (exemplary of the prior-art techniques), and C. tungsten phosphate-coated molybdenum electrode assemblies, ARE AS FOLLOWS: A. failed through oxidation and subsequent disintegration, with accompanying seal and lamp failure at 100 hours'' operation, B. failed at approximately 150 hours of life testing, C. was still operating on a life test after 200 hours. Processes for forming metal phosphides from metal phosphates and process for coating leads with refractory metal phosphates and phosphides are also disclosed.
Inventors
- 👤 V Chiola
- 👤 J Smith
- 👤 C Vanderpool
Bibliographic Details
Claims Analysis
Total Claims: 5References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |