Patent US2709766A successfully refreshed from Google Patents.
US2709766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent lamp
Assignee: Westinghouse Electric Corp
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Filing: 1951-06-04
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Granted: 1955-05-31
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Expires: 1971-06-04
Abstract
No abstract record available.
Inventors
- 👤 Nagy Rudolph
- 👤 Eugene P Etzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:25
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
87 words
IN A FLUORESCENT LAMP, AN ENVELOPE SURFACE HAVING A COATING THEREON, SAID COATING CONSISTING OF A PHOSPHOR AND A GLASS, SAID PHOSPHOR BEING CAPABLE OF EMITTING VISIBLE LIGHT WHEN EXPOSED TO ULTRAVIOLET RADIATION, SAID GLASS BEING SINTERED TO SAID FLUORESCENT LAMP ENVELOPE SURFACE AND BEING COMPRISED OF ABOUT 81 PARTS BY WEIGHT OF ZINC OXIDE, 51 PARTS BY WEIGHT OF ALUMINUM OXIDE, AND 64 PARTS BY WEIGHT OF PHOSPHORUS PENTOXIDE, AND THE RATIO OF SAID GLASS TO SAID PHOSPHOR IN SAID COATING BEING FROM 0.05/99.95 TO 3/97.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-30 | 1958-11-29 | 1959-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-30 | 1962-11-29 | 1963-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-30 | 1966-11-29 | 1967-05-31 | $7700.00 | Window Closed / Lapsed |