US4176267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave energy trap
Assignee: Armstrong World Industries Inc
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Filing: 1978-05-12
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Granted: 1979-11-27
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Expires: 1998-05-12
Abstract
Abstract A microwave energy trap for use in conjunction with the exit and entrance ports of a conveyorized microwave oven. The energy trap operates to prevent the escape of microwave energy through the ports into the surrounding environment. The energy trap comprises a tunnel having a current suppressing coating, resonant slots communicating through the wall of the tunnel, and waveguide chambers located over the slots for absorbing and dissipating microwave energy.
Inventors
- 👤 Werner Rueggeberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:53
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/78; B; B82; B82Y; B82Y10/00; H05B6/76
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
133 words
A microwave energy trap for use in conjunction with a microwave oven having a conductive enclosure wherein materials are treated with microwave energy, the enclosure having access ports and a conveyor means passing through the access ports and conductive enclosure, said energy trap comprising: (a) a tunnel means with walls enclosing one of the access ports of said oven outside of said enclosure, said conveyor means passing through the tunnel means; (b) a plurality of resonant slot means passing through one or more of the walls of said tunnel means; (c) a plurality of closed waveguide chamber means disposed on the outside of said tunnel means over said resonant slot means for entrapping microwave energy; and (d) a plurality of energy absorbing means disposed within said waveguide chamber means for dissipating microwave energy.
Claim 2
Dependent Claim
133 words
A microwave energy trap for use in conjunction with a microwave oven having a conductive enclosure wherein materials are treated with microwave energy, the enclosure having access ports and a conveyor means passing through the access ports and conductive enclosure, said energy trap comprising: (a) a tunnel means with walls enclosing one of the access ports of said oven outside of said enclosure, said conveyor means passing through the tunnel means; (b) a plurality of resonant slot means passing through one or more of the walls of said tunnel means; (c) a plurality of closed waveguide chamber means disposed on the outside of said tunnel means over said resonant slot means for entrapping microwave energy; and (d) a plurality of energy absorbing means disposed within said waveguide chamber means for dissipating microwave energy.
Claim 3
Dependent Claim
22 words
The microwave energy trap of claim 1 further including an energy absorbing coating adhered to the inside walls of said tunnel means.
Claim 4
Dependent Claim
31 words
The microwave energy trap of claim 1 wherein said energy absorbing means are panels coated with lossy dielectric energy absorbing material and disposed along the central portion of said waveguide chambers.
Claim 5
Dependent Claim
20 words
The microwave energy trap of claims 2 or 3 wherein said resonant slot means comprise slots one-half wavelength in length.
Claim 6
Dependent Claim
24 words
The microwave energy trap of claims 2 or 3 further including an energy absorbing coating on the inside surfaces of said waveguide chamber means.
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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) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |