US3676176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making fluorescent lamps
Assignee: GTE Sylvania Inc
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Filing: 1970-09-28
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Granted: 1972-07-11
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Expires: 1990-09-28
Abstract
Abstract THE INNER WALL OF A TABULAR, OPEN-ENDED GLASS ENVELOPE IS COATED WITH A PHOSPHOR BY FLUSHING A LIQUID PHOSPHOR SUSPENSION THERETHROUGH. IN ORDER TO IMPROVE THE UNIFORMITY OF THICKNESS OF THE PHOSPHOR, THE ENVELOPE IS POSITIONED VERTICALLY AND THE WET PHOSPHOR IS ZONE DRIED WHILE AIR IS PASSED THROUGH THE ENVELOPE.
Inventors
- 👤 Willy P Schreurs
- 👤 Lawrence W Kimball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:52
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |