US3221198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sodium vapor lamp having a tin oxide coating
Assignee: US Philips Corp
•
Filing: 1962-09-26
•
Granted: 1965-11-30
•
Expires: 1982-09-26
Abstract
No abstract record available.
Inventors
- 👤 Wal Johannes Van Der
- 👤 Pieter Martinus Van Alphen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:13
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/34; H01J61/35; H01J61/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A SODIUM VAPOR LAMP COMPRISING A LIGHT-TRANSMISSIBLE ENVELOPE SURROUNDING A SODIUM VAPOR DISCHARGE TUBE, SAID LIGHT-TRANSMISSIBLE ENVELOPE HAVING ON THE INNER SURFACE THEREOF FACING THE SODIUM VAPOR DISCHARGE TUBE OF COATING OF TIN OXIDE.
Claim 2
Dependent Claim
34 words
A SODIUM VAPOR LAMP COMPRISING A LIGHT-TRANSMISSIBLE ENVELOPE SURROUNDING A SODIUM VAPOR DISCHARGE TUBE, SAID LIGHT-TRANSMISSIBLE ENVELOPE HAVING ON THE INNER SURFACE THEREOF FACING THE SODIUM VAPOR DISCHARGE TUBE OF COATING OF TIN OXIDE.
References Cited (Backward Citations)
US2795721A
Cited
US2899584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |