US3563772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Envelope for a sodium vapor discharge lamp
Assignee: US Philips Corp
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Filing: 1967-12-28
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Granted: 1971-02-16
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Expires: 1987-12-28
Abstract
Abstract AN ENVELOPE FOR A SODIUM VAPOR LAMP CONSISTS OF A GLASS RESISTANT TO ATTACK BY SODIUM VAPOR WHICH IS AN ALKALINE EARTH SILICATE IN WHICH AL2O3 IS PRESENT, NAMELY A SMALL RANGE OF COMPOSITIONS IN THE SYSTEM RO-AL2O-SIO2
Inventors
- 👤 Hendrik Jacobus Maria Joormann
- 👤 Gustaaf Adolf Wesselink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:54
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/302; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/076; C03C3/083; C03C3/085; C03C3/087
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |