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Patent US3742394A successfully refreshed from Google Patents.
US3742394A
Expired / Lapsed
US
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Tuning means in a microwave heating apparatus
Assignee: Canadian Patents and Development Ltd
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Filing: 1971-12-20
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Granted: 1973-06-26
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Expires: 1991-12-20
Abstract
Abstract Tuning means in a microwave heating apparatus comprises a slotted waveguide section connecting a microwave energy source to a microwave heating means, a tuning probe extending into the slotted waveguide section through the slot, a motor driven carriage slidable along the slot and mounting the tuning probe, two voltage standing wave pattern sensing probes attached to the carriage and extending into the slotted waveguide through the slot, and a control circuit connected to the sensing probes and the electric motor for tuning the apparatus by moving the tuning probe along the slot. Two further probes, which are similar to the sensing probes, may be provided together with further circuitry for indicating on a voltmeter when adjustment is necessary of the depth that the tuning probe extends into the slotted waveguide section.
Inventors
- 👤 Koughnett A Van
- 👤 W Wyslouzil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:36
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
157 words
In a microwave heating apparatus, comprising a microwave energy source, and a microwave heating means, a microwave tuning means connecting the microwave energy source to the microwave heating means, the tuning means comprising a slotted waveguide section, a carriage outside the slotted waveguide section and slidable along the slot therein, a tuning probe extending into the waveguide section through the slot, means adjustably mounting the tuning probe on the carriage for adjusting the distance the tuning probe extends into the waveguide section to the correct depth for tuning, at least two sensing probes extending into the waveguide section to sense the voltage standing wave pattern, means mounting the sensing probes at a fixed distance apart from each other and from the tuning probe, and means connected to the carriage and responsive to changes in the voltage standing wave pattern sensed by the probes, for tuning the microwave heating section by moving the tuning probe along the slot.
Claim 2
Dependent Claim
157 words
In a microwave heating apparatus, comprising a microwave energy source, and a microwave heating means, a microwave tuning means connecting the microwave energy source to the microwave heating means, the tuning means comprising a slotted waveguide section, a carriage outside the slotted waveguide section and slidable along the slot therein, a tuning probe extending into the waveguide section through the slot, means adjustably mounting the tuning probe on the carriage for adjusting the distance the tuning probe extends into the waveguide section to the correct depth for tuning, at least two sensing probes extending into the waveguide section to sense the voltage standing wave pattern, means mounting the sensing probes at a fixed distance apart from each other and from the tuning probe, and means connected to the carriage and responsive to changes in the voltage standing wave pattern sensed by the probes, for tuning the microwave heating section by moving the tuning probe along the slot.
Claim 3
Dependent Claim
91 words
Tuning means according to claim 1, wherein two sensing probes are provided on the means for mounting the probes for sensing the voltage standing wave pattern, two further probes are mounted on the means for mounting the probes, a means having a voltage output, connected to the sensing probes and further probes, is for detecting any manual adjustment necessary of the distance that the tuning probe extends into the slotted waveguide section, and a voltmeter is connected to the voltage output for indicating any necessary manual adjustment of the tuning probe.
Claim 4
Dependent Claim
28 words
Tuning means according to claim 1, wherein adjustable means are provided, for maintaining the sensing means at a fixed distance from the carriage, for adjusting the fixed distance.
Claim 5
Dependent Claim
25 words
Tuning means according to claim 1, which includes two slides extending along the slotted waveguide section, and the carriage is slidably mounted on the slides.
Claim 6
Dependent Claim
50 words
Tuning means according to claim 1, which includes a lead screw rotatably mounted on and extending along the slotted waveguide section, the lead screw engaging a threaded bore in the carriage for moving the carriage along the slotted waveguide section, and an electric motor drive connected to the lead screw.
Claim 7
Dependent Claim
32 words
Tuning means according to claim 5, which includes limit switches, at each end of the movement of the carriage along the slotted waveguide section for reversing the rotation of the electric motor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |