US3679452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating lehring-sensitive phosphor onto lamp envelope
Assignee: Philips North America LLC
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Filing: 1971-01-28
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Granted: 1972-07-25
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Expires: 1991-01-28
Abstract
Abstract FOR COATING LAMP ENVELOPES WITH PHOSPHOR WHICH NORMALLY IS SENSITIVE TO LEHRING, A SMALL AOUNT OF ROOMTEMPERATURE-STABLE, METAL-FREE, AMMONIA-RADICAL-CONTAINING COMPOUNDS WHICH WILL DECOMPOSE ON HEATING TO RELEASE AMMONIA GAS IS INCLUDED IN THE PHOSPHOR PAINT. THE PAINT ALSO INCLUDES A SMALL AMOUNT OF ORGANIC BINDER MATERIAL. WHEN THE COATING PAINT IS LEHRED AFTER APPLICATION TO DECOMPOSE THE ORGANIC BINDER, THE AMMONIA COMPOUND ALSO DECOMPOSES TO RELEASE AMMONIA GAS WHICH PRESERVES THE DESIRED VALENCE STATE OF THE ACTIVATOR IN THE PHOSPHOR. THE FINISHED DISCHARGE LAMP HAS IMPROVED PERFORMANCE.
Inventors
- 👤 Richard C Ropp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:08
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02; C09K11/08; C09K11/70; C09K11/71
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |