US5272302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave oven with improved cooking uniformity
Assignee: Maytag Corp
•
Filing: 1992-12-10
•
Granted: 1993-12-21
•
Expires: 2012-12-10
Abstract
Abstract A microwave oven having microwave absorbing material disposed in a top portion of the microwave oven cooking cavity above a grease shield. By absorbing reflected microwave radiation, this feature reduces the tendency of overcooked edges, particularly in low profile foods such as pizza. An additional feature includes a cylindrical member disposed around the microwave antenna to provide a directive pattern of microwave energy in the cooking cavity. The microwave oven provides improved cooking uniformity for foods such as pizzas or pies.
Inventors
- 👤 Kenneth W. Dudley
- 👤 John S. Sklenak
- 👤 Joseph C. Maiellano, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:10
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/6402
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
153 words
A microwave oven comprising: a cooking cavity having a bottom wall, a top wall, and side walls; means disposed in an upper portion of said cooking cavity for radiating a directive pattern of microwave energy in said cooking cavity; a microwave transparent shield disposed horizontally in said cooking cavity and separating said upper portion of said cooking cavity from a lower portion of said cooking cavity; means comprising a microwave lossy material and disposed in said upper portion of said cooking cavity adjacent to said microwave energy radiating means for absorbing reflected microwave energy to improve cooking uniformity; and said radiating means including an antenna disposed in said upper portion of said cooking cavity and a cylindrical member disposed around said antenna, said cylindrical member having a first end disposed adjacent to the top wall of the cooking cavity, cylindrical sides and, a second end having an aperture disposed below said radiating means.
Claim 2
Dependent Claim
153 words
A microwave oven comprising: a cooking cavity having a bottom wall, a top wall, and side walls; means disposed in an upper portion of said cooking cavity for radiating a directive pattern of microwave energy in said cooking cavity; a microwave transparent shield disposed horizontally in said cooking cavity and separating said upper portion of said cooking cavity from a lower portion of said cooking cavity; means comprising a microwave lossy material and disposed in said upper portion of said cooking cavity adjacent to said microwave energy radiating means for absorbing reflected microwave energy to improve cooking uniformity; and said radiating means including an antenna disposed in said upper portion of said cooking cavity and a cylindrical member disposed around said antenna, said cylindrical member having a first end disposed adjacent to the top wall of the cooking cavity, cylindrical sides and, a second end having an aperture disposed below said radiating means.
Claim 3
Dependent Claim
20 words
The microwave oven recited in claim 1 wherein said absorbing means is attached to the top surface of said shield.
Claim 4
Dependent Claim
24 words
The microwave oven recited in claim 1 wherein the height of said cooking cavity is substantially less than the width of said cooking cavity.
Claim 5
Dependent Claim
16 words
The microwave oven recited in claim 3 wherein said microwave energy absorbing means is silicon carbide.
References Cited (Backward Citations)
US2920174A
Cited
US3127494A
Cited
US3218429A
Cited
US3493709A
Cited
US3643055A
Cited
US3783220A
Cited
US3731037A
Cited
US3764770A
Cited
US3884213A
Cited
US4185181A
Cited
US4430538A
Cited
US4687895A
Cited
US4803324A
Cited
US4822966A
Cited
WO1990003716A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-12-20 | 1997-06-21 | 1997-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-20 | 2001-06-21 | 2001-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-20 | 2005-06-21 | 2005-12-21 | $7700.00 | Window Closed / Lapsed |