Patent US3752948A successfully refreshed from Google Patents.
US3752948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetron starting circuit
Assignee: Goodman Co LP
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Filing: 1971-10-01
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Granted: 1973-08-14
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Expires: 1991-10-01
Abstract
Abstract A circuit for and method of operating microwave oven apparatus is disclosed including means for the momentary interruption of the starting cycle at a predetermined time interval. Such operation will shift the operating mode of the energy generator as well as the voltage level from a higher to a lower frequency to prolong life and enhance efficiency. The invention is particularly suited for permanent magnet type energy generators for use in microwave oven apparatus where continuous operation is utilized. The invention may be implemented in all types of microwave oven apparatus simply and economically.
Inventors
- 👤 D Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:53
CPC Classifications
H; H03; H03B; H03B9/00; H03B9/01; H03B9/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
Microwave oven apparatus comprising: an enclosure defined by conductive walls; a microwave energy generator adapted to radiate energy within said enclosure; electrical circuit means for energizing said generator including line voltage source means and high voltage transformer means having primary and secondary windings with said primary winding connected to said source means; mean for energizing said circuit including a first manually operated siwtch; and means coupled to said primary winding including a secind switch and automatic delay timer means connected to said second switch for opening and closing said energized circuit for a predetermined time interval of 0.1 to 0.4 seconds approximately 3-5 seconds after said first switch is closed.
Claim 2
Dependent Claim
110 words
Microwave oven apparatus comprising: an enclosure defined by conductive walls; a microwave energy generator adapted to radiate energy within said enclosure; electrical circuit means for energizing said generator including line voltage source means and high voltage transformer means having primary and secondary windings with said primary winding connected to said source means; mean for energizing said circuit including a first manually operated siwtch; and means coupled to said primary winding including a secind switch and automatic delay timer means connected to said second switch for opening and closing said energized circuit for a predetermined time interval of 0.1 to 0.4 seconds approximately 3-5 seconds after said first switch is closed.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |