US3590202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Construction for tuning microwave heating applicator
Assignee: Bechtel Corp
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Filing: 1970-02-24
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Granted: 1971-06-29
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Expires: 1990-02-24
Abstract
Abstract A microwave heating applicator that operates in the TM modes having a substantially cylindrical resonant cavity in which elongate material is heated while being processed therethrough. A microwave heating applicator having a perforated end cap on one end, said end cap having perforations for admitting heated air into the cavity, the size of each perforation being sufficiently small relative to its length to attenuate the transmission of microwave energy, a manifold for receiving heated air and guiding the air toward the perforations in the end cap; and a cylindrical metal sleeve mounted in openings through the end cap and manifold, one end of said sleeve projecting into the resonant cavity and the other end being accessible for adjusting its axial position as to tune the cavity.
Inventors
- 👤 John D A Day
- 👤 Edward J Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:55
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/80; H05B6/70; H05B6/705
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
147 words
In a microwave heating applicator having a substantially cylindrical resonant cavity, a perforated end cap mounted to one end of said applicator, said end cap having perforations for admitting heated air into the cavity, the size of each perforation being sufficiently small relative to its length to inhibit the transmission of microwave energy therethrough, means defining a central opening through said end cap and coaxial relative to said cavity; means defining a plenum at the one end of said applicator for receiving heated air and guiding the air through the perforations in said end cap, said plenum means having an opening coaxial with the opening of said end cap; and a cylindrical tuning sleeve mounted in the openings through said end cap and plenum means, one end of said cylindrical sleeve extending into said cavity, the other end of said sleeve projecting out from said plenum means.
Claim 2
Dependent Claim
147 words
In a microwave heating applicator having a substantially cylindrical resonant cavity, a perforated end cap mounted to one end of said applicator, said end cap having perforations for admitting heated air into the cavity, the size of each perforation being sufficiently small relative to its length to inhibit the transmission of microwave energy therethrough, means defining a central opening through said end cap and coaxial relative to said cavity; means defining a plenum at the one end of said applicator for receiving heated air and guiding the air through the perforations in said end cap, said plenum means having an opening coaxial with the opening of said end cap; and a cylindrical tuning sleeve mounted in the openings through said end cap and plenum means, one end of said cylindrical sleeve extending into said cavity, the other end of said sleeve projecting out from said plenum means.
Claim 3
Dependent Claim
45 words
The microwave heating applicator of claim 1, the opening through said end cap being defined by a substantially cylindrical mounting sleeve having a segmented end that extends into said cavity and terminates at a distance approximately one-fourth wavelength from the near end of the cavity.
Claim 4
Dependent Claim
27 words
The microwave heating applicator of claim 2, said segmented end comprising a plurality of fingers that taper axially inward and provide resiliency for griping said tuning sleeve.
Claim 5
Dependent Claim
44 words
The microwave heating applicator of claim 1, said end cap comprising a cylindrical wall section that defines a portion of the resonant cavity and having a connecting flange for attachment to the applicator, the axial length of said wall portion being approximately one-fourth wavelength.
Claim 6
Dependent Claim
122 words
A microwave heating applicator having a resonant cavity adapted to operate in the TM modes and comprising: a cylindrical waveguide; an end cap mounted at one end of said waveguide, said end cap being perforated and having a central opening coaxial of said waveguide the size of each perforation being sufficiently small relative to its length to inhibit the transmission of microwave energy therethrough; a plenum in communication with said perforations and having an opening therethrough and a cylindrical metal tuning sleeve extending through the opening of said end cap and axially adjustable therein, one end of said sleeve projecting into the resonant cavity and the other end being accessible to adjust the axial position of the sleeve and tune the cavity.
Claim 7
Dependent Claim
122 words
A microwave heating applicator having a resonant cavity adapted to operate in the TM modes and comprising: a cylindrical waveguide; an end cap mounted at one end of said waveguide, said end cap being perforated and having a central opening coaxial of said waveguide the size of each perforation being sufficiently small relative to its length to inhibit the transmission of microwave energy therethrough; a plenum in communication with said perforations and having an opening therethrough and a cylindrical metal tuning sleeve extending through the opening of said end cap and axially adjustable therein, one end of said sleeve projecting into the resonant cavity and the other end being accessible to adjust the axial position of the sleeve and tune the cavity.
Claim 8
Dependent Claim
78 words
The microwave heating applicator of claim 5, said end cap comprising a substantially cylindrical mounting sleeve for supporting said metal tuning sleeve, and further comprising a mainfold mounted To said end cap for receiving heated air and guiding the air through the perforated end cap into the resonant cavity, said manifold having an opening therethrough coaxial with the mounting sleeve and the central opening of said end cap, said mounting sleeve extending through the opening of said manifold.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |