US3225302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetrons for dielectric heating
Assignee: Husqvarna Vapenfabriks AB
•
Filing: 1962-03-06
•
Granted: 1965-12-21
•
Expires: 1982-03-06
Abstract
No abstract record available.
Inventors
- 👤 Ojelid Goran Axel Runo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:51
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/52; H03F1/54; H03F1/546; H03F1/544
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
IN APPARATUS FOR DIELECTRIC HEATING: A MAGNETRON HAVING AN ANODE, A CATHODE AND A FILAMENT FOR HEATING SAID CATHODE, A CURRENT SOURCE FOR SAID FILAMENT, A VOLTAGE SOURCE FOR SAID ANODE, MEANS SUPPLYING TO SAID FILAMENT FROM SAID CURRENT SOURCE A CURRENT SUFFICIENT TO MAINTAIN SAID CATHODE AT AN ELEVATED READINESS TEMPERATURE ABOVE THE AMBIENT TEMPERATURE BUT BELOW ITS ORDINARY OPERATION TEMPERATURE, MEANS TEMPORARILY INCREASING THE CURRENT THROUGH SAID FILAMENT DURING THE STARTING PERIOD OF THE MAGNETRON TO THEREBY RAISE THE TEMPERATURE OF THE CATHODE TO A HEATING TEMPERATURE, WHICH IS AT LEAST EQUAL TO ITS ORDINARY OPERATING TEMPERATURE DURING SAID STARTING PERIOD, SAID MEANS INCREASING THE CURRENT INCLUDING MANUALLY ACTUATABLE SWITCH MEANS CONNECTED TO SAID VOLTAGE SOURCE, AND MEANS FOR PREVENTING THE APPLICATION OF ANODE VOLTAGE TO SAID ANODE BEFORE THE EXPIRATION OF SAID TIME INTERVAL.
Claim 2
Dependent Claim
137 words
IN APPARATUS FOR DIELECTRIC HEATING: A MAGNETRON HAVING AN ANODE, A CATHODE AND A FILAMENT FOR HEATING SAID CATHODE, A CURRENT SOURCE FOR SAID FILAMENT, A VOLTAGE SOURCE FOR SAID ANODE, MEANS SUPPLYING TO SAID FILAMENT FROM SAID CURRENT SOURCE A CURRENT SUFFICIENT TO MAINTAIN SAID CATHODE AT AN ELEVATED READINESS TEMPERATURE ABOVE THE AMBIENT TEMPERATURE BUT BELOW ITS ORDINARY OPERATION TEMPERATURE, MEANS TEMPORARILY INCREASING THE CURRENT THROUGH SAID FILAMENT DURING THE STARTING PERIOD OF THE MAGNETRON TO THEREBY RAISE THE TEMPERATURE OF THE CATHODE TO A HEATING TEMPERATURE, WHICH IS AT LEAST EQUAL TO ITS ORDINARY OPERATING TEMPERATURE DURING SAID STARTING PERIOD, SAID MEANS INCREASING THE CURRENT INCLUDING MANUALLY ACTUATABLE SWITCH MEANS CONNECTED TO SAID VOLTAGE SOURCE, AND MEANS FOR PREVENTING THE APPLICATION OF ANODE VOLTAGE TO SAID ANODE BEFORE THE EXPIRATION OF SAID TIME INTERVAL.
References Cited (Backward Citations)
US2104844A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |