US4503760A — Forced convection oven

Claim 1

Independent Claim 136 words

A device for cooking or heating food, comprising: (a) a housing with an inside; (b) a stationary support inside said housing with a position for supporting food; (c) means for supplying a stream of hot air to said inside; (d) hollow drum means rotatably mounted to said housing in said inside and said stationary support projecting into an open end of said drum means and said drum means being rotatable about said stationary support and said drum means including a side wall; and, (e) opening means disposed in said sidewall over a preselected area thereof and substantially the remaining area of said sidewall being solid whereby rotation of said drum means causes corresponding rotation of said opening means and thereby generally radially directs hot air to the position of the food for uniformly heating the food.

Claim 2

Independent Claim 136 words

A device for cooking or heating food, comprising: (a) a housing with an inside; (b) a stationary support inside said housing with a position for supporting food; (c) means for supplying a stream of hot air to said inside; (d) hollow drum means rotatably mounted to said housing in said inside and said stationary support projecting into an open end of said drum means and said drum means being rotatable about said stationary support and said drum means including a side wall; and, (e) opening means disposed in said sidewall over a preselected area thereof and substantially the remaining area of said sidewall being solid whereby rotation of said drum means causes corresponding rotation of said opening means and thereby generally radially directs hot air to the position of the food for uniformly heating the food.

Claim 3

Dependent Claim 40 words

A device as defined in claim 1, wherein: (a) said opening means includes a supply opening for directing air towards said food and at least a first return air opening for communicating air from said drum means to said inside.

Claim 4

Dependent Claim 17 words

The device as defined in claim 2, wherein: (a) said supply opening includes a longitudinally extending slot.

Claim 5

Dependent Claim 22 words

The device as defined in claim 3, wherein: (a) said slot is generally rectangular in shape and has substantial length and width.

Claim 6

Dependent Claim 21 words

The device as defined in claim 2, wherein: (a) a plurality of return air openings are disposed about said side wall.

Claim 7

Dependent Claim 27 words

The device as defined in claim 5, wherein: (a) said drum means has a closed end; and, (b) said return air openings are adjacent said closed end.

Claim 8

Dependent Claim 18 words

The device as defined in claim 5, wherein: (a) said return air openings are generally rectangular in shape.

Claim 9

Dependent Claim 26 words

The device as defined in claim 5, wherein: (a) said supply opening is axially spaced from and angularly disposed between two of said return air openings.

Claim 10

Dependent Claim 48 words

The device as defined in claim 2, wherein: (a) said means for supplying includes heating means for heating air to a preselected temperature; (b) a supply conduit connects said heating means with said inside; and, (c) a fan communicates heated air from said heating means to said inside.

Claim 11

Dependent Claim 53 words

The device as defined in claim 9, wherein: (a) said inside includes a pair of annular chambers; and, (b) a first one of said annular chambers is associated with said supply opening and the other one of said pair of annular chambers is associated with said at least a first return air opening.

Claim 12

Dependent Claim 35 words

The device as defined in claim 10, wherein: (a) said fan has an inlet communicating with the annular chamber associated with said at least a first return air opening for thereby permitting recirculation of air.

Claim 13

Dependent Claim 68 words

A device as claimed in claim 1, wherein the drum has an inside, an outside and a cylindrical side wall with a supply opening for permitting the stream of hot air to pass from the outside of the drum to the inside, rotation of the drum causing the supply opening to rotate about the support and the food so the stream of hot air moves about the food.

Claim 14

Dependent Claim 28 words

A device as claimed in claim 12, wherein the drum is rotatable about an axis which passes generally through the position for the food on the stationary support.

Claim 15

Dependent Claim 24 words

A device as claimed in claim 13, wherein the axis is horizontal, the open end comprising an opening for placing food on the support.

Claim 16

Dependent Claim 34 words

A device as claimed in claim 14, wherein the supply opening is located on the side wall of the drum at a position outwards from the position for the food on the stationary support.

Claim 17

Dependent Claim 36 words

A device as claimed in claim 15, wherein the drum has a return air opening for permitting the stream of hot air to return from the inside of the drum to the outside of the drum.

Claim 18

Dependent Claim 46 words

A device as claimed in claim 16, wherein the means for supplying the stream of hot air comprises a fan, a supply conduit extending from the fan to the drum near the supply opening thereof and means for heating the stream of air from the fan.

Claim 19

Dependent Claim 21 words

A device as claimed in claim 17, wherein the means for heating the stream of air comprises a stationary electric element.

Claim 20

Dependent Claim 47 words

A device as claimed in claim 18, further comprising an annular hot air chamber in the housing which extends about the drum to communicate with the supply opening, the electric element being within the hot air chamber and the supply conduit communicating with the hot air chamber.

Claim 21

Dependent Claim 94 words

A device as claimed in claim 19, wherein the drum has a closed back end which is opposite the open end, the return air opening being on the side wall of the drum near the back end, the oven further comprising an annular, return air chamber in the housing which extends about the drum to communicate with the return air opening, the fan having an intake communicating with the return chamber so that hot air returning from the inside of the drum is recirculated by the fan through the supply conduit towards the food.

Claim 22

Dependent Claim 21 words

A device as claimed in claim 14, further comprising an electric motor operatively connected to the drum for rotating the drum.

Claim 23

Dependent Claim 31 words

A device as claimed in claim 16, wherein the drum has a back end and a plurality of said return air openings spaced-apart about the side wall near the back end.

Claim 24

Dependent Claim 33 words

A device as claimed in claim 22, further comprising a peripheral seal adjacent the side wall of the drum between the hot air chamber and the return air chamber for sealing said chambers.

Claim 25

Dependent Claim 29 words

A device as claimed in claim 17, further comprising a door on the housing adjacent the open end of the drum for access to the support for the food.

Claim 26

Dependent Claim 19 words

A device as claimed in claim 24, wherein the support comprises a perforated tray for mounting on the bracket.

Claim 27

Dependent Claim 40 words

A device as claimed in claim 17, further comprising a cantilevered bracket for the stationary support, the bracket being connected to the housing near the front end of the drum and extending into the drum through the open end thereof.

Claim 28

Dependent Claim 25 words

A device as claimed in claim 18, wherein the electric element is capable of heating the stream of air to a temperature of 450° Farenheit.

Claim 29

Dependent Claim 21 words

A device as claimed in claim 1, wherein the drum is rotatable at a speed of generally 7 revolutions per minute.

Claim 30

Independent Claim 161 words

A device for cooking or heating food, comprising: (a) a housing with an inside; (b) a stationary support inside said housing having a position for supporting food; (c) means for supplying a stream of hot air to said inside; (d) hollow drum means rotatably mounted to said housing and disposed in said inside, said stationary support projects into an open end of said drum means and said drum means is rotatable about said stationary support; (e) said drum means includes an air impervious side wall; (f) a plurality of openings are disposed in said side wall; and, (g) a first one of said openings is adapted for communicating heated air from said inside to generally said position and the other ones of said openings are adapted for communicating air from said drum whereby rotation of said drum means causes corresponding rotation of said first one opening for thereby generally radially directing hot air to said position for uniformly heating the food.

Claim 31

Independent Claim 161 words

A device for cooking or heating food, comprising: (a) a housing with an inside; (b) a stationary support inside said housing having a position for supporting food; (c) means for supplying a stream of hot air to said inside; (d) hollow drum means rotatably mounted to said housing and disposed in said inside, said stationary support projects into an open end of said drum means and said drum means is rotatable about said stationary support; (e) said drum means includes an air impervious side wall; (f) a plurality of openings are disposed in said side wall; and, (g) a first one of said openings is adapted for communicating heated air from said inside to generally said position and the other ones of said openings are adapted for communicating air from said drum whereby rotation of said drum means causes corresponding rotation of said first one opening for thereby generally radially directing hot air to said position for uniformly heating the food.

Claim 32

Dependent Claim 91 words

The device as defined in claim 29, wherein: (a) a first and second annular chamber are disposed in said inside; (b) said first annular chamber is associated with said first one opening and said second chamber is associated with the other ones of said openings; (c) a fan has an inlet communicating with said second annular chamber and an outlet communicating with said first annular chamber for thereby providing recirculation of air; and, (d) electric heating means are associated with said first annular chamber for heating air to a preselected temperature.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1988-03-11	1988-09-10	1989-03-12	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1992-03-11	1992-09-10	1993-03-12	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1996-03-11	1996-09-10	1997-03-12	$7700.00	Window Closed / Lapsed

Forced convection oven

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