US2586768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum tube electrode element
Assignee: Driver Harris Co
•
Filing: 1949-02-24
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Granted: 1952-02-26
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Expires: 1969-02-24
Abstract
No abstract record available.
Inventors
- 👤 Francis E Bash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:20
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14; H01J19/00; H01J19/28; H01J19/30; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; H01J2893/002; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2958
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
A VACUUM TUBE HAVING ELECTRODE ELEMENTS AT LEAST ONE OF WHICH IS COMPOSED OF NICKEL AND TRACES OF RATE EARTH METALS.
Claim 2
Dependent Claim
21 words
A VACUUM TUBE HAVING ELECTRODE ELEMENTS AT LEAST ONE OF WHICH IS COMPOSED OF NICKEL AND TRACES OF RATE EARTH METALS.
References Cited (Backward Citations)
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US1916410A
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US2075718A
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US2304353A
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US2246162A
Cited
US2204391A
Cited
US2456370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |