Patent US3666534A successfully refreshed from Google Patents.
US3666534A
Expired / Lapsed
US
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Method of manufacturing glass articles having a heat-reflecting film
Assignee: US Philips Corp
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Filing: 1970-04-13
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Granted: 1972-05-30
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Expires: 1990-04-13
Abstract
Abstract THE INVENTION RELATES TO THE MANUFACTURE OF A GLASS ENVELOPE FOR A SODIUM VAPOUR DISCHARGE LAMP WHICH ENVELOPE IS PROVIDED WITH A FILM OF DOPED INDIUM OXIDE. TO OBTAIN AN ENVELOPE HAVING BOTH FEW INTERNAL MECHANICAL TENSIONS AND A GREAT HEAT REFLECTIVITY, THE ENVELOPE IS HEATED FOR 5 TO 15 MINUTES AT A GIVEN TEMPERATURE AFTER IT HAS BEEN PROVIDED WITH THE INDIUM OXIDE FILM, DURING WHICH HEAT TREATMENT THE INDIUM OXIDE FILM IS CONTACTED WITH A GAS MIXTURE COMPRISING A VERY SMALL PERCENTAGE OF OXYGEN.
Inventors
- 👤 Rolf Groth
- 👤 Henricus Johannes Joseph Boort
- 👤 Gerard Marie Jules De Neve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:02
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/25; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/215; C03C2217/24; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/112
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |