Liquid nitrogen freezer

Claim 2

A compact and portable freezer which utilizes a liquid coolant such as liquid nitrogen, comprising: housing means having an internal freezer cavity, and having wall portions defining a freezer opening extending from said freezer cavity to without said housing; door means for selectively closing said freezer opening; means being manually activatable for providing the liquid coolant into said freezer cavity; tray means dimensioned for being insertable into said freezer cavity and having a rectangular configuration comprising a flat bottom wall, a pair of elongate side walls, an end wall and a front wall, said bottom wall has a plurality of spaced drain hole means to enable drainage and to expedite freezing with a collection of the liquid coolant within said freezer cavity; and means for supporting said tray means within said freezer cavity at a predetermined height.

Claim 3

A freezer as in claim 1, wherein: the housing means has a generally rectangular configuration and dimensioned for being mountable on a table.

Claim 4

A freezer as in claim 1, including: liner means having a plurality of elongate slide track means.

Claim 5

A freezer as in claim 1, wherein: the housing means comprises a pair of side walls, a rear wall, a bottom wall, a top wall, a lower sloped front wall, and an upper box like valve housing, said side walls have a front upper outwardly sloping end portion and a lower sloping end portion, said rear wall has a generally rectangular shape with at least one vent hole.

Claim 6

A freezer as in claim 1, wherein: the supporting means comprises a plurality of spaced slide tracks mounted on a discrete liner means dimensioned for being insertable within said freezer cavity and to enable said tray means to be disposed thereon.

Claim 7

A freezer as in claim 1, including: liner means having a generally rectangular shape with a pair of side walls, an end wall, a sloped front wall and a bottom wall, said bottom wall having said means for supporting said tray means being integrally formed thereon, said liner being formed of stainless steel and dimensioned for being insertable into said freezer cavity and to enable said tray means to be placed on said supporting means.

Claim 8

A freezer as in claim 1, wherein: the door means has a rectangular shape and is hinge mounted to said housing means such that in its closed position for being at a sloped angle.

Claim 9

A freezer as in claim 1, wherein: the means for providing liquid coolant comprises a solenoid valve, a timing relay and a serpentine manifold having a plurality of spray orifices, said manifold is mounted within said freezer cavity and is connected to an outlet port of said solenoid valve, said solenoid valve has an inlet port being connectable to the liquid coolant, said timing relay is operatively connected to said solenoid valve and to a switch means for energizing said solenoid valve to an open state for a predetermined time period with each manual actuation of said switch means.

Claim 10

A freezer as in claim 1, wherein: the tray means has rectangular configuration comprising a flat bottom wall, a pair of elongate side walls, an end wall and a front wall, said front wall is sloped and configured to facilitate manual manipulation and removal of said tray means from without said housing means, said bottom wall has a plurality of spaced drain holes.

Claim 11

A table top liquid nitrogen type freezer system for providing liquid nitrogen from a discrete source of liquid nitrogen onto an item, in combination comprising: housing means (11) having a generally rectangular shape and dimensioned for being disposed atop a table, said housing having a pair of side walls (17,18), a rear wall (19), a bottom wall (21), a top wall (22), a lower sloped front wall (50), and an upper box like valve housing (23), said side walls have a front upper outwardly sloping end portion (24) and a lower sloping end portion (25), said rear wall has a generally rectangular shape with a plurality of vent holes (26), said housing means having an internal freezer box cavity (51) with a freexer opening (12) extending without said housing means defined by portions of said sloped front wall (50) and the front upper outwardly sloping end portions (24) of said side walls and said top wall; door means (13) hinge (33,34) mounted to said top wall and being dimensioned for being disposed in a closed position with peripheral wall portions being in juxtaposition with the housing wall portions defining said freezer opening; means for regulating the flow of the liquid nitrogen from the source of liquid nitrogen to the freezer box cavity, said regulating means having a solenoid valve (36), a timing relay means (37) operatively coupled to said solenoid valve, a serpentine configured manifold (15) having a plurality of liquid nitrogen spray nozzles (41), a first conduit (42) connecting said manifold to an outlet port (40) of said solenoid valve, a second conduit (61) connecting an inlet port (39) of said solenoid valve to the source of liquid nitrogen (60), a manually actuatable switch means (38) operatively coupled to said timing relay, and an insulating coating (43) about said first conduit; liner means (70) having a generally rectangular shape with a bottom wall (71), a pair of side walls (72 and 73), a rear wall (74) a sloped front wall 75, and a plurality of spaced parallel elongate slide tracks (29); tray means (16 or 55) having a generally rectangular shape with a flat bottom wall (45), a pair of side walls (46,47), a rear wall (48), and a sloped front wall (49 or 57), said bottom wall has a plurality of spaced drain holes (30); and a hood means (20) having a generally elongate rectangular shape being cantilevered mounted along an elongate wall edge to said top wall (20) to have an outwardly sloping disposition with its lower wall edge (28) extending downwardly below said vent holes (26); whereby the liquid nitrogen freezer system being manually transportable to enable use at one or more selected positions with being mounted on a table top and for enabling relatively quick freezing of an item placed within said freezer box cavity with spraying of the liquid nitrogen within said freezer box cavity.

Claim 12

A table top liquid nitrogen type freezer system for providing liquid nitrogen from a discrete source of liquid nitrogen onto an item, in combination comprising: housing means (11) having a generally rectangular shape and dimensioned for being disposed atop a table, said housing having a pair of side walls (17,18), a rear wall (19), a bottom wall (21), a top wall (22), a lower sloped front wall (50), and an upper box like valve housing (23), said side walls have a front upper outwardly sloping end portion (24) and a lower sloping end portion (25), said rear wall has a generally rectangular shape with a plurality of vent holes (26), said housing means having an internal freezer box cavity (51) with a freexer opening (12) extending without said housing means defined by portions of said sloped front wall (50) and the front upper outwardly sloping end portions (24) of said side walls and said top wall; door means (13) hinge (33,34) mounted to said top wall and being dimensioned for being disposed in a closed position with peripheral wall portions being in juxtaposition with the housing wall portions defining said freezer opening; means for regulating the flow of the liquid nitrogen from the source of liquid nitrogen to the freezer box cavity, said regulating means having a solenoid valve (36), a timing relay means (37) operatively coupled to said solenoid valve, a serpentine configured manifold (15) having a plurality of liquid nitrogen spray nozzles (41), a first conduit (42) connecting said manifold to an outlet port (40) of said solenoid valve, a second conduit (61) connecting an inlet port (39) of said solenoid valve to the source of liquid nitrogen (60), a manually actuatable switch means (38) operatively coupled to said timing relay, and an insulating coating (43) about said first conduit; liner means (70) having a generally rectangular shape with a bottom wall (71), a pair of side walls (72 and 73), a rear wall (74) a sloped front wall 75, and a plurality of spaced parallel elongate slide tracks (29); tray means (16 or 55) having a generally rectangular shape with a flat bottom wall (45), a pair of side walls (46,47), a rear wall (48), and a sloped front wall (49 or 57), said bottom wall has a plurality of spaced drain holes (30); and a hood means (20) having a generally elongate rectangular shape being cantilevered mounted along an elongate wall edge to said top wall (20) to have an outwardly sloping disposition with its lower wall edge (28) extending downwardly below said vent holes (26); whereby the liquid nitrogen freezer system being manually transportable to enable use at one or more selected positions with being mounted on a table top and for enabling relatively quick freezing of an item placed within said freezer box cavity with spraying of the liquid nitrogen within said freezer box cavity.

Claim 13

A table top liquid nitrogen type freezer system as in claim 10, wherein: the housing means is formed of a 3/4 inch or greater high density polyethylene to enable contraction and/or expansion of a portion of said housing means with temperature changes within said internal freezer box cavity; the liner means is formed of stainless steel; and the tray means is formed of stainless steel and being dimensioned to generally fit within said liner means.