US2920786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric discharge tube
Assignee: US Philips Corp
•
Filing: 1957-06-19
•
Granted: 1960-01-12
•
Expires: 1977-06-19
Abstract
No abstract record available.
Inventors
- 👤 Duran Johannes Christiaan
- 👤 Bakker Martinus Antonius Maria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:29
CPC Classifications
C; C03; C03C; C03C27/00; C03C27/04; C03C27/042; C03C27/046; H; H01; H01J; H01J21/00; H01J21/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
AN ELECTRIC DISCHARGE TUBE COMPRISING AN ENVELOPE HAVING A GLASS PORTION HERMETICALLY SEALED TO A METAL MEMBER, SAID METAL MEMBER COMPRISING AN IRON-CHOMIUM BASE AN EXTREMELY THIN FIRST LAYER OF A METAL SELECTED FROM THE GROUP CONSISTING OF COBALT AND NICKEL COVERING SAID BASE, A SECOND EXTREMELY THIN LAYER OF GOLD COVERING SAID FIRST METAL LAYER, A RELATIVELY THICK LAYER OF SILVER COVERING SAID GOLD LAYER, AND A LAYER OF CHROMIUM OXIDE COVERING SAID SILVER AND SEALING SAID MEMBER TO SAID GLASS PORTION.
Claim 2
Dependent Claim
83 words
AN ELECTRIC DISCHARGE TUBE COMPRISING AN ENVELOPE HAVING A GLASS PORTION HERMETICALLY SEALED TO A METAL MEMBER, SAID METAL MEMBER COMPRISING AN IRON-CHOMIUM BASE AN EXTREMELY THIN FIRST LAYER OF A METAL SELECTED FROM THE GROUP CONSISTING OF COBALT AND NICKEL COVERING SAID BASE, A SECOND EXTREMELY THIN LAYER OF GOLD COVERING SAID FIRST METAL LAYER, A RELATIVELY THICK LAYER OF SILVER COVERING SAID GOLD LAYER, AND A LAYER OF CHROMIUM OXIDE COVERING SAID SILVER AND SEALING SAID MEMBER TO SAID GLASS PORTION.
References Cited (Backward Citations)
US1989236A
Cited
US2480453A
Cited
US2471424A
Cited
US2683835A
Cited
US2670572A
Cited
US2617959A
Cited
US2760310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |