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Patent US3379302A successfully refreshed from Google Patents.
US3379302A
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US
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Sodium-vapor discharge lamp having an envelope with a porous inner wall
Assignee: US Philips Corp
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Filing: 1965-12-10
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Granted: 1968-04-23
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Expires: 1985-12-10
Abstract
No abstract record available.
Inventors
- 👤 Burggraaf Anthonie Jan
- 👤 Ernest Onno Willem Van D Stelt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:22
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/0305; C; C03; C03C; C03C17/00; C03C17/02; C03C17/06; C03C17/10; H01J; H01J5/00; H01J5/02; H01J5/08; H01J61/00; H01J61/02; H01J61/30; H01J61/35; H01J9/00; H01J9/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB851595A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |