Patent US2132807A successfully refreshed from Google Patents.
Patent US3349282A successfully refreshed from Google Patents.
US3349282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and arrangement for more rapidly heating indirectly heated cathodes in electron tubes
Assignee: US Philips Corp
•
Filing: 1965-06-10
•
Granted: 1967-10-24
•
Expires: 1985-06-10
Abstract
No abstract record available.
Inventors
- 👤 Krieger Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:16
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/22; H01J9/00; H01J9/20; H03; H03F; H03F1/00; H03F1/52; H03F1/54; H03F1/544
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A CIRCUIT ARRANGEMENT FOR RAPIDLY HEATING AN INDIRECTLY HEATED CATHODE IN AN ELECTRON DISCHARGE TUBE, SAID CATHODE HAVING A HEATING ELEMENT SURROUNDED BY A CATHODE SUPPORT, SAID CIRCUIT ARRANGEMENT COMPRISING MEANS TO CONNECT SAID HEATING ELEMENT TO A SOURCE OF ELECTRICAL ENERGY FOR HEATING THE SAME, AND MEANS TO COUPLE SAID HEATING ELEMENT TO A SOURCE OF HIGH-FREQUENCY ENERGY, AND MEANS TO INDUCTIVELY COUPLED SAID HEATING ELEMENT TO SAID CATHODE SUPPORT TO HEAT THE SAME.
Claim 2
Dependent Claim
75 words
A CIRCUIT ARRANGEMENT FOR RAPIDLY HEATING AN INDIRECTLY HEATED CATHODE IN AN ELECTRON DISCHARGE TUBE, SAID CATHODE HAVING A HEATING ELEMENT SURROUNDED BY A CATHODE SUPPORT, SAID CIRCUIT ARRANGEMENT COMPRISING MEANS TO CONNECT SAID HEATING ELEMENT TO A SOURCE OF ELECTRICAL ENERGY FOR HEATING THE SAME, AND MEANS TO COUPLE SAID HEATING ELEMENT TO A SOURCE OF HIGH-FREQUENCY ENERGY, AND MEANS TO INDUCTIVELY COUPLED SAID HEATING ELEMENT TO SAID CATHODE SUPPORT TO HEAT THE SAME.
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) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |