US3717781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aperture fluorescent lamp having uniform surface brightness
Assignee: GTE Sylvania Inc
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Filing: 1969-09-19
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Granted: 1973-02-20
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Expires: 1989-09-19
Abstract
Abstract THE APERTURE OF AN APERTURE FLUORESCENT LAMP IS WIDER AT THE ENDS OF THE LAMP THAN AT THE CENTER IN ORDER TO IMPROVE THE UNIFORMITY OF THE LIGHT OUTPUT PROFILE ALONG THE ENTIRE LENGTH OF THE LAMP.
Inventors
- 👤 T Sadoski
- 👤 W Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:47
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/35
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |