Patent US3156844A successfully refreshed from Google Patents.
US3156844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier tube having a thermionic cathode without heater
Assignee: Siemens and Halske AG
•
Filing: 1960-08-31
•
Granted: 1964-11-10
•
Expires: 1980-08-31
Abstract
No abstract record available.
Inventors
- 👤 Veith Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:50
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A HIGH VACUUM AMPLIFIER TUBE HAVING A THERMIONIC CATHODE, SAID CATHODE COMPRISING A CONDUCTIVE CATHODE CARRIER, A LAYER OF EMISSION MATERIAL DISPOSED THEREON, AND AN ARTIFICALLY PRODUCED RESISTANCE LAYER DISPOSED BETWEEN THE CARRIER AND THE EMISSION LAYER, SAID INTERMEDIATE LAYER HAVING A RESISTANCE WHICH IS SUFFICIENTLY HIGH THAT THE CONSTANT EMISSION CURRENT, OPERATING AS A TRANSVERSE CURRENT THROUGH SAID RESISTANCE LAYER, IS OPERATIVE AS THE SOLE HEATING MEANS FOR MAINTAINING THE CATHODE AT OPERATING TEMPERATURE, AND AT LEAST ONE AUXILIARY ELECTRODE DISPOSED IN ENGAGEMENT WITH SAID EMISSION LAYER, SAID AUXILIARY ELECTRODE BEING OPERATIVE, WHEN POSITIVELY BIASED, TO FORM AN AUXILIARY CURRENT PATH BETWEEN IT AND SAID CARRIER FOR THE TRAVERSING OF AN INITIAL CURRENT OPERATIVE TO INITIATE EMISSION.
Claim 2
Dependent Claim
118 words
A HIGH VACUUM AMPLIFIER TUBE HAVING A THERMIONIC CATHODE, SAID CATHODE COMPRISING A CONDUCTIVE CATHODE CARRIER, A LAYER OF EMISSION MATERIAL DISPOSED THEREON, AND AN ARTIFICALLY PRODUCED RESISTANCE LAYER DISPOSED BETWEEN THE CARRIER AND THE EMISSION LAYER, SAID INTERMEDIATE LAYER HAVING A RESISTANCE WHICH IS SUFFICIENTLY HIGH THAT THE CONSTANT EMISSION CURRENT, OPERATING AS A TRANSVERSE CURRENT THROUGH SAID RESISTANCE LAYER, IS OPERATIVE AS THE SOLE HEATING MEANS FOR MAINTAINING THE CATHODE AT OPERATING TEMPERATURE, AND AT LEAST ONE AUXILIARY ELECTRODE DISPOSED IN ENGAGEMENT WITH SAID EMISSION LAYER, SAID AUXILIARY ELECTRODE BEING OPERATIVE, WHEN POSITIVELY BIASED, TO FORM AN AUXILIARY CURRENT PATH BETWEEN IT AND SAID CARRIER FOR THE TRAVERSING OF AN INITIAL CURRENT OPERATIVE TO INITIATE EMISSION.
References Cited (Backward Citations)
US2875367A
Cited
US2939990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-10 | 1968-05-11 | 1968-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-10 | 1972-05-11 | 1972-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-10 | 1976-05-11 | 1976-11-10 | $7700.00 | Window Closed / Lapsed |