Patent US3670134A successfully refreshed from Google Patents.
US3670134A
Expired / Lapsed
US
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Microwave oven no-load sensor
Assignee: Goodman Co LP
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Filing: 1971-01-26
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Granted: 1972-06-13
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Expires: 1991-01-26
Abstract
Abstract A no-load sensor is disclosed for protection of the electromagnetic wave energy generator in an electronic heating apparatus including a magnetized body of a ferrimagnetic material disposed within the waveguide launching section. Improved magnetic field producing means include a field concentrator associated with a permanent magnet member. Embodiments are also provided within a waveguide launching section having a reduced cross-sectional area adjacent to the ferrimagnetic body to concentrate propagated electromagnetic waves with a resultant decrease in the material requirements for exciting electron spin action to direct reflected energy from a load to energy absorbing means.
Inventors
- 👤 Arnold M Bucksbaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:41
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/70; H05B6/707; H05B6/705; H05B6/72; H05B6/725; Y; Y02; Y02B; Y02B40/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
74 words
High frequency heating apparatus comprising: an enclosure; an electromagnetic energy generator; means for coupling said energy from said generator to said enclosure; said coupling means having a passage therethrough with a section thereof of reduced cross-sectional area; nonreciprocal transmission means including a magnetized ferrimagnetic material disposed within said reduced crosssectional area to receive and propagate in a direction away from said generator energy reflected from said enclosure; and means for absorbing said reflected energy.
Claim 2
Dependent Claim
74 words
High frequency heating apparatus comprising: an enclosure; an electromagnetic energy generator; means for coupling said energy from said generator to said enclosure; said coupling means having a passage therethrough with a section thereof of reduced cross-sectional area; nonreciprocal transmission means including a magnetized ferrimagnetic material disposed within said reduced crosssectional area to receive and propagate in a direction away from said generator energy reflected from said enclosure; and means for absorbing said reflected energy.
Claim 3
Dependent Claim
103 words
High frequency heating apparatus comprising: an enclosure; an electromagnetic energy generator; means for coupling said energy from said generator to said enclosure including a waveguide transmission line; said coupling means having a passage therethrough with a section thereof of reduced cross-sectional area; a circulator including a member of a ferrimagnetic material disposed within said reduced cross-sectional area to receive and propagate in a direction away from said generator energy reflected from said enclosure; means for magnetizing said ferrimagnetic material with the magnetic field flux lines being directed substantially perpendicular to the face of the ferrimagnetic member; and means for absorbing said reflected energy.
Claim 4
Dependent Claim
103 words
High frequency heating apparatus comprising: an enclosure; an electromagnetic energy generator; means for coupling said energy from said generator to said enclosure including a waveguide transmission line; said coupling means having a passage therethrough with a section thereof of reduced cross-sectional area; a circulator including a member of a ferrimagnetic material disposed within said reduced cross-sectional area to receive and propagate in a direction away from said generator energy reflected from said enclosure; means for magnetizing said ferrimagnetic material with the magnetic field flux lines being directed substantially perpendicular to the face of the ferrimagnetic member; and means for absorbing said reflected energy.
Claim 5
Dependent Claim
17 words
The apparatus according to claim 2 wherein said coupling means include a section of hollow rectangular waveguide.
Claim 6
Dependent Claim
19 words
The apparatus according to claim 2 wherein said coupling means include a three-sided hollow transmission line having rounded corners.
Claim 7
Dependent Claim
52 words
The apparatus according to claim 2 wherein said energy is first launched in a waveguide coupling means having a predetermined height consonant with the frequency of operation and the remainder of said coupling means including the section of reduced cross-sectional area has an overall height of approximately one-half the first height dimension.
Claim 8
Dependent Claim
21 words
The apparatus according to claim 2 wherein said magnetizing means include a permanent magnet member mounted opposite to the ferrimagnetic member.
Claim 9
Dependent Claim
22 words
The apparatus according to claim 2 wherein said magnetizing means include a submounted permanent magnet member disposed in said reduced cross-sectional area.
Claim 10
Dependent Claim
36 words
The apparatus according to claim 2 wherein said magnetizing means include a magnet member disposed opposite to the ferrimagnetic material member and mounted wholly within the plane defined by the outer confines of said waveguide line.
Claim 11
Dependent Claim
33 words
The apparatus according to claim 2 wherein said member of ferrimagnetic material is supported by a member of a magnetizable material to concentrate the magnetic field flux density within the said ferrimagnetic material.
Claim 12
Dependent Claim
28 words
The apparatus according to claim 2 wherein said ferrimagnetic member is mounted on a pedestal member of a magnetizable material abutting a wall of said waveguide transmission line.
Claim 13
Dependent Claim
20 words
The apparatus according to claim 10 wherein said pedestal member has an annular notch section for engaging said waveguide wall.
Claim 14
Dependent Claim
30 words
The apparatus according to claim 2 wherein said energy absorbing means are disposed within a branch section of waveguide having a narrower width than the remainder of said coupling means.
References Cited (Backward Citations)
US3437777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |