Patent US2615140A successfully refreshed from Google Patents.
US2615140A
Expired / Lapsed
US
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Electric discharge tube containing an alkaline metal
Assignee: Hartford National Bank and Trust Co
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Filing: 1949-08-17
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Granted: 1952-10-21
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Expires: 1969-08-17
Abstract
No abstract record available.
Inventors
- 👤 Claessen Wilhelmus Huber Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:17
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/38; H01J9/395
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
AN ELECTRIC DISCHARGE TUBE HAVING A GIVEN ANODE CURRENT CHARACTERISTIC CURVE, COMPRISING AN ENVELOPE, A BARIUM OXIDE COATED CATHODE SOURCE OF ELECTRON EMISSION WITHIN SAID ENVELOPE, AN ANODE OF GIVEN WORK POTENTIAL SPACED FROM SAID CATHODE WITHIN SAID ENVELOPE, AND AN ALKALI METAL IN SAID TUBE IN THE FREE STATE IN AN AMOUNT ONLY SUFFICIENT TO MAINTAIN SAID GIVEN ANODE WORK POTENTIAL SUBSTANTIALLY CONSTANT DURING THE OPERATING LIFE OF SAID TUBE.
Claim 2
Dependent Claim
71 words
AN ELECTRIC DISCHARGE TUBE HAVING A GIVEN ANODE CURRENT CHARACTERISTIC CURVE, COMPRISING AN ENVELOPE, A BARIUM OXIDE COATED CATHODE SOURCE OF ELECTRON EMISSION WITHIN SAID ENVELOPE, AN ANODE OF GIVEN WORK POTENTIAL SPACED FROM SAID CATHODE WITHIN SAID ENVELOPE, AND AN ALKALI METAL IN SAID TUBE IN THE FREE STATE IN AN AMOUNT ONLY SUFFICIENT TO MAINTAIN SAID GIVEN ANODE WORK POTENTIAL SUBSTANTIALLY CONSTANT DURING THE OPERATING LIFE OF SAID TUBE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-21 | 1956-04-21 | 1956-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-21 | 1960-04-21 | 1960-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-21 | 1964-04-21 | 1964-10-21 | $7700.00 | Window Closed / Lapsed |