# US 5,705,797 A · Unitary microwave oven door

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- Number: US 5,705,797 A
- Document ID: US5705797A
- Status: Granted
- Kind: A
- Application number: 08/583,433
- Filed: 1996-01-05
- Granted: 1998-01-06
- Earliest claimed: 1995-04-03
- Assignees: LG Electronics Inc.
- Inventors: Dong Wan Seo
- Web page: https://patentgrep.com/patent/US5705797A

## CPC

- H05B 6/763: {Microwave radiation seals for doors}
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

A door for preventing leakage of electromagnetic wave of a microwave oven includes: a front panel forming a front surface of a door; a first contact surface expanded from the circumference of the front panel and recessed forward a cavity of the microwave oven so as to contact an entrance of the cavity; a door frame portion expanded from the circumference of the first contact surface and proceeding to the front surface of the door so as to form a frame of the door; a second contact surface expanded from the circumference of the door frame portion and recessed toward the cavity so as to contact a frame of the cavity entrance; a choke cavity formed between the door frame and the second contact surface; and a slit formed on the circumference of the door frame in a predetermined interval and expanded into the choke cavity in a predetermined length. Thus, leakage of the electromagnetic wave can be prevented due to the slit shape of a predetermined period. Also, various designs can be provided by making the door panel to be attached of detached to/from the door frame.

## Claims

### Claim 1

A unitary microwave oven door comprising:
a front panel forming a front surface of a door;
a first contact surface continuous with said front panel and recessed toward a cavity of said microwave oven to form a planar face to come into contact with an entrance to said cavity;
a door frame portion continuous with said first contact surface and formed in the same plane with said front panel; and
a slit portion with said door frame portion and bent in a C-shaped configuration to form a choke cavity, said slit portion having a vertical face to come into contact with an entrance of said cavity and an upper horizontal face to form a catch,
wherein the front panel, the first contact surface, the door frame portion and the slit portion are all formed from one continuous plate.

### Claim 2 (depends on 1)

A unitary microwave oven door as claimed in claim 1, wherein said vertical face of said slit portion has a stepped configuration.