Patent US2920786A successfully refreshed from Google Patents.
US2920786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric discharge tube
Assignee: US Philips Corp
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Filing: 1957-06-19
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Granted: 1960-01-12
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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 15:58
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)
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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) | 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 |