US2025698A

US2025698A - Gas solidifying apparatus

Info

Publication number: US2025698A
Application number: US279641A
Authority: US
Inventors: Harry W Cole; Malcolm W Mclaren
Original assignee: International Carbonic Engineering Co
Current assignee: International Carbonic Engineering Co
Priority date: 1928-05-22
Filing date: 1928-05-22
Publication date: 1935-12-24
Anticipated expiration: 1952-12-24

Description

Dec. 24, 1935. H, W, COLE -r AL 2,025,698

GAS SOLIDIFYING APPARATUS lFiled May 22, 1928 5 Sheets-Sheet 1 zZ-iii Mmf Dec. 24, 1935. H. w. COLE ET Al.

GAS SOLIDIFYING APPARATUS Filed May 22, 1928 5 Sheets- Sheet 2 S. IZ- U g /VJ w /Vvv mw R R mmm H Q 9A. m. Q Nm o o ,i mln w Q. .W1 QE. mkm. .wrhm

Dec. 24, 1935. n H. w. COLE Er Al. 2,025,698

GAS SOLIDIFYING APPARATUS Filed May 22, v1928 5 Sheets-Sheet 3 Mi@ KMC/M Patented Dec. 24, 1935 GAS SOLIDIFYING APPARATUS Harry W. Cole, New

McLaren, J mesne assignments, Engineering Company, corporation o! Delaware Rochelle, and Malcolm W. Heights, N. Y., anignon, by to International Carbonio Kennett Square, Pa., a

Application May 22, 1928, Serial No. 279,641

lO paratus as has been` available for this specific purpose and to provide a machine which produces the desired product rapidly an cal l catlon.

Referring to the drawings, Fig. 1 is a. diagrammatic representation oi a system of refrigeration which embodies our invention;

Fig. 2 is a sectional elevation, and

Fig. 3 is a plan view,'partly in section of certain parts oi the apparatus which are shown in Fig. l.; Fig. 4 is a perspective view of the product of the apparatus shown in Figs. 2 and 3; Y

Fig. 5 is a sectional elevation of a form oi that part of the mechanism which is shown in Figs. 2 and 3;

Fig. 6 is a sectional plan view of the apparatus shown in Fig. 5, the section being taken on line 5-6 oi the latter figure; and

Fig. '7 is an inverted perspective view of the product of the apparatus shown in Fig. 5.

. In Fig. 1 the gas from any source is led to the solidifying plant through a pipe IIJ, being impelled by an exhauster I I, preferably of a motor- I2 is connected by a pipe I3 with the supply pipe I0. As this is of the usual inverted bell-type, it serves to maintain a suillcient supply oi gas and to maintain it at a practically constant pressure. While we do not claim as a part of our invention and have not shown the devices for accomplishing a drive the exhauster Il intermittently by an electric motor holder I2. :A revolution counter on the exhauster II may be used as a. measuring or metering device.

The gas to be solidified is led throughs pipe Il into a compressor I5 from which it is discharged F0 through a pipe I6 at a desired high pressure, for

example, about 1200 lbs. per square inch.

A certain amount of oil is carried along from the compressor with the gas, often to an objectionable extent. It has been difllcult to remove 55 `this oil. We discharge the gas heated by the comdriven positive type. A gas holder convenient feature, it is usual to controlled by contacts on the gas for solidifyly. ther objects will appear in the followin 39 Claims. (Cl. 62.-121) presser downwardly. into Van oil separator N in the form oi a vertically disposed cylinder.

In the lower part of this separator is a pervious mass ci material, such for example as steel turnings. These are contained in and supported by a wire basket 2l in such a way as to leave a spacel under the mass. The oil is deposited in this pervious mass. which serves the further purpose of preventing the velocity of the gas from carrying the oil out from the top of the separator. .22 is a valve through which the oil may be drained. The gas is taken out from the top of the separator and led by a pipe 23V into a condenser.

The condenser comprises a receptacle 2|, in

which a circulation o! cooling water is maintained in the usual manner, and a pipe coil 25. Here the compressed gas is llqueed.

From the condenser the liquefied gas is led by a pipe 25 to the lower portion of a moisture and air eliminator 3l. This too comprises a vertically disposedcylindrical casing. In it a mass 3| of suitable material, such as carbon, is held between perforated headers 32 and 33, positioned to leave spaces below and above the permeable. mass. The liquefied gas is admittedinto the lower of these spaces and vr,discharged through a pipe 34 from the upper space. The charcoal permits the liqueed gas to move upwardly but is sufficiently large in cross sectional area, greatly to reduce its velocity. Any water which has passed from the rcompressor and has been condensed will settle in the bottom of the eliminator as it is heavier than the liquefied gas, and can be withdrawn by opening valve 35.

Air or non-liquid gases accumulate in a chamber 36 at the top of the eliminator, from which they may be discharged through a valve 3l.

The purified liquefied gas 'is then led to the chamber into which it is discharged through nozzles 5I,4 5I (Fig. 2) its flow being controlled by an automatic valve 39. From the eliminator 30 to the nozzles, the liqueied gas passes through a direct path 38 or through a counter-current heat exchanger l0, or partly through both. Valves are provided to control its path.

In the chamber 50 the liqueed gas expands into a gas, some o! which solidifies as frozen snow-like crystals .These drop down into a compression chamber Bll, toward which nozzles 5I, 5I are directed and in which is a plunger 6I. The other end of this compressiony chamber is closed by a movable head 10. The unfrozen gas escapes from chamber 50 through orifices 52 into a jacket 53, irom which it is led by a pipe B0 to a circulating exhauster 8|, through the heat exchanger 40, or partly through both, as determined by the valves shown. By adjusting the high pressure liqueed gas and of the cold low pressure gas which pass through the heat exchanger, the temperature of the liqueiied gas at the nozzles may be controlled.

'Ihe exhauster 9| drives the low pressure gas to an expansion tank 02 from which it is returned to the gas holder |2 by a pipe 03. 'I'he expansion tank serves as a cushion to prevent large pressure variations in the low pressure side of the system.

Around the exhauster 0| a by-pass is provided in which is a diaphragm valve 84 which may be set to maintain automatically a definite pressure condition within the interconnected chambers 50 and and the lines and apparatus between them and the exhauster 8|.

62 is a cylinder in which is a piston 63 having a rod 6l connected with plunger 6|. One end of pipe 61 with-a pressure tank 69.

1| is a cylinder in which is a piston 12 having a rod 13 connected with head' 10. One end of cylinder 1| is connected by a pipe 14 with apressure tank 15 and its other end is connected by a pipe 16 with a pressure tank 11. pressure tanks contain water, glycerine, oil or other liquid, for actuating the

pistons

63 and 12.

90 is a pipe leading i'rom the pressure pipe I6 to the four pressure tanks and having valve controlled connections therewith above the liquid.

expansion chamber 50 falls-by the compression chamber 60. When the plunger 6| is retracted, there is unobstructed communication between the chamber 50 and the compression chamber 60, and this communication isclosed at its sides so that it is gas-tight.

High pressure non-liquefied gas admitted to the pressure tank 15 above the water therein, forces the water through pipe 14 into cylinder 1| at the right hand side of piston 12. At this time the space above the water in pressure tank 11 is in communication with the low pressure pipe 9| so that piston 12 moves the head 10 to the left to close the end of the compression chamber.

After a desired amount of solidified gas has accumulated in the compression chamber, the upper part of pressure tank 68 is connected to the low pressure pipe 9| and the upper part of pressure tank 66 is connected to the high pressure pipe 90. The water admitted to cylinder 02 through pipe 65 forces piston 63 and plunger 6| to the right. As plunger 6I advances, it first closes communication between the expansion chamber 50 and the compression chamber 60 and This is an important gravity into 2,025,698 either directly or then compresses the solidiied gas between itself and the head 10 into a solid cake.

During this part oi a check valve 69 into the low pressure pipe 80. feature of our invention as the entrapment of gas and air' has heretofore made it dlilicult to produce solid cakes of desired form.

Now the is released end of the nipulation hydraulic pressure back of piston and the head 10 removed from the compression chamber by proper maof the gas connections between pres- 15 and 11 and the

pipes

90 and 9|. 'I'hen the plunger 6| is caused to move further to the right to eject the cake.

In Fig. 1 there is shown automatically controlling the valve 39 and the enough to cut ofi' communication between

chambers

50 and 60, the motor circuit is broken by the separation of contacts 9G and the valve 39 is closed by connections 91. When the plunger is moved back, the motor circuit closes and valve 30 39 opens.

communicating with an outer The nozzles are placed at 5|A. plunger connected by a rod |04 |05 in a cylinder |08. 'I'his plunger :tits loosely in chamber |00 to permit gases to pass it as it descends. Ports A and 61A are provided for connection with the water pi 'I'he lower end of |00 is arranged to be closed by a head |01 Awhich is connected with a piston |08 This apparatus is operated in the manner pre- |05A is an indicator planes formed by this member. has the advantage once.

We realize that other forms of apparatus than those shown in order to illustrate our invention can be used without departing fro its spirit and scope and intend no limitations other than those imposed by the following claims.

What we claim is:

l. Gas solidifying apparatus including an expansion chamber, a compression chamber below and in sas-tight the solidified gas, and a movable head against which the solidified gas is compressed.

2. A gas solidifying system including a gas compressor, a condenser, a closed chamber, means for supplying liquefied gas to said chamto form an accumulation of solidified gas in the chamber, a gas return line having an exhauster therein for leading the unsolidified portion of the chamber back to the gas compressor, and means in said gas return line for maintaining a definite pressure condition in said chamber.

3. A gas solidifying system including a gas compressor, a condenser, a closed chamber, means for supplying liquefied gas to said chamber for expansion to form an accumulation of solidified gas in the chamber, a gas` return line for conducting the unsolidiiied portion of the expanded gas from the chamber back to the compressor, means in said gas return line controlling the flow of gas there-through, an expansion chamber in said return line, a by-pass around the gas flow controlling means in said line, and means for regulating said by-pass to thereby maintain a definite pressure condition in said chamber. I

, 4. A solidified gas producing and compressing. apparatus including a closed compression chamber, means for supplying! a liquefied gas to said chamber to form anaccumulation of solidified gas in the chamber, a plunger for compressing the solidified gas, a head against which said solidified gas is compressed, and -hydraulic means for moving the plunger and the head.

5. A. gas solidifying apparatus including. a gas compressor, means for liquefying the compressed gas, a compression chamber, means for supplying liquefied gas for expansion to form an accumulation of solidified gas in the chamber, means for compacting the solidified gas in the compression chamber, a return line for conducting the unsolidiiied portion of the expanded gas from the compression chamber back to the gas compressor, a heat exchanger, and adjustable means for passing desired portions of the liquefied gas and of the expanded gas from the compression chamber through the heat exchanger.

6. In apparatus of the class described, a chamber, a conduit for supplying liquefied gas to said chamber for expansion in the chamber, means for conducting expansion gases from the chamber, a heat exchanger interrelating said liquid supply conduit and said gas conducting means, by-passes around the heat exchanger for the liquefied gas and for the expansion gas, and means for regulating the flow of said fluids through the heat exchanger.

'7. A refrigerating system including a closed chamber, means for supplying liquefied gas to said chamber, adjustable means y .the temperature of the entering liquefied gas, and adjustable means for maintaining a desired pressure in said chamber.

8. A gas solidifying and compressing apparatus, including a chamber, means for supplying liquefied gas to said chamber to form an accumulation of solidified gas in-the chamber, a plunger in the chamr, a head closing an end of said chamber, means for actuating the plunger to compress solidified gas in the chamber against said head, and means for moving the `head to permit the removal of the compressed solidified gas. 9. Gas solidifying and compressing apparatus, including a source of liquefied gas, an expanexpanded gas from the sion chamber, a compression chamber below and in gas-tight unobstructed communication with the expansion chamber, means for supplying liquefied gas from said source to produce" an accumulation of solidified gas in the 'compression chamber, a plunger arranged to close the communication between said chambers and to compress the solidified gas, and a movable member arranged to form the closure vfor the compression chamber against which the solidified gas is compressed.

10. A gas solidifylng and compressing apparatus including a compression chamber, means for supplying liquefied gas to produce an accumulation of solidified gas in the chamber, a l5 plungerA for' compressing the solidified gas, a movable head arranged to form the closure of the compression chamber against which the solidiiied gas is compressed, and means controlled by the movement of the plunger for controlling said liquefied gas supplying means.

11. A gas solidifying apparatus including a closed chamber, means for supplying liquened gas to said chamber to convert a portion of the liquefied gas into a solid and a portion into a gas,

a conduit for withdrawing said gas rom the chamber. and means in the conduit for maintaining a definite pressure in the chamber.

A 12. A gas solidifying apparatus including a closed chamber,I means for supplying liquefied gas to saidv chamber for expansion to convert a portion of the liquefied gas into a Vsolid and a portion into 'a gas, a conduit for withdrawing gas from the chamber, and adjustable means in the conduit for maintaining a definite pressure in the chamber.

13. Gas solidifylng apparatus including a closed chamber, means for supplying liquefied gas to said chamber for expansion to form an accumulation of solidified gas in the means for controlling the temperature of the entering liquefied gas, adjustable means for maintaining a desired pressure in said chamber, and means for compressing the. solidified gas in the chamber.

14. A gas solidifying apparatus including a compression chamber closed to atmosphere, means for supplying a liquefied gas to form an accumulation ofsolidified ga's in the chamber,

means for maintaining a definite pressure. in said chamber, and means for compressingthe solidified gas in the chamber.

15. A gas solidifying apparatus including a compression chamber closed to atmosphere, means for supplying a accumulation of solidified gas in the chamber, adjustable means` for maintaining a definite pressure in said chamber, and means for compressing the solidified gas in the chamber.

16. Gas solidifying and compressing apparatus, including a compression chamber, meansv for supplying a liquefied gas to said chamber for expansion to form a portion thereof into a solid and a portion into gas, a conduit for withdrawing gas from said chamber, a plunger for compressing the solidiiied gas in thev chamber, a head against which said solidified gas is compressed by said plunger, a vent connected to the space in which the solidified gas is compressed, to prevent entrapment of gas between the plunger and 'the head, and means for conducting gas from said vent back to said conduit.

17. In apparatus for forming a liquefied gas into a solid mass, the combination of means for expanding the liquefied gas to form solid partiliquefied gas to form an' chamber, adjustable 40 cles, means for compressing the particles into a solid mass, and rotatable means, to feed`said particles to said compressing means.

18. In gas solidifying and compressingapparatus, the combination with anopen ended chamber, and means for supplying'iiqueiied gas to said chamber to form particles of solidied gas in the chamber, oi means for compressing said particles moval of the compacted mass, said compressing means being adapted to then eject the compacted mass. ,f

19. In gas solidifying and compressing apparatus, the combination with an open ended chamber and means for supplying liquefied gas to said chamber to form particles of solidied gas in the chamber, of means for compressing said solidiiied gas particles into a compacted mass, a cylinder and piston, and means operated thereby for closingvsaid chamber during the compressing operation.

20. 'I'he method o1' making carbon dioxide snow from liquid carbon dioxide by releasing it from critical pressure, which method includes cooling the liquid; permitting free. sudden expansion of said liquid by discharge through a nozzle; deposit- 21. The method of making carbon dioxide snow from liquid carbon dioxide by releasing it from critical pressure, which method includes permitting rapid expansion of the liquid by discharge from a pipe, depositing the resultant snow by maintaining the gaseous and solidproducts of the expansion in a relatively large volume chamber cold atmosphere produced by lsuch expansion, and while in such atmosphere,

dislodging and collecting the deposited snow i'or the purposes described.

22. Gas solidifying and compressing apparatus including a source of liquefied lgas-tight unobstructed communication with the expansion chamber, means ior supplying the liqueiied gas to the chamber for expansion to produce an accumulation of solidified gas in the compression chamber, in combination with means for closing communication between the chambers and compressing the solidified gas in said compression chamber.

23. A gas solidii'ying and compressing appamunication between said chambers and to com- 2,025,698 ,Dress the solidmed gas,

and a movable element forming `an end of the compression chamber and against which the solidified sas is "compressed.

25. Gas solidifying and compressing apparatus 5 including means providing a gas solidincation solidiied gas is compressed by saidA plunger.

28. Gas solidifying and compressing apparatus including a compression chamber, suppling a liqueed gas for expansion to produce chamber.

29. A gas solidifying tus including a closed compression chamber,

a movable abutment 60 30. In gas solidifying and pressing apparatus, 65

pressing chamand compressing appara- 55 portion of` the liquid to a solid and a the chamber, iiuid pressure means for moving said plunger to of solidified gas in said chamber when said closure member is in chamber closing position, and said closure member, upon completion of the pressing operation, being movable to chamber opening position for removal of the pressed solid from the chamber.

31. In a gas solidifying and block forming apparatus, a normally closed and gas-tight solidification and block pressing chamber, means for supplying a liquefied gas to said chamber when the chamber is closed for expansion to convert a portion to a gas, means for withdrawing the unsolidified gas from the chamber during accumulation of a mass of solidified gas in the chamber, a pressing plunger in the chamber movable to press an accumulated mass of solidified gas into a block, said plunger normally inactive during expansion of the liquefied gas and accumulation of the solidified gas in the chamber, means for actuating the plunger to press an accumulated mass of the solidified gas in the chamber into a dense, block of solidified gas, and means for opening said chamber after completion of the block by said pressing plunger for removal of the block from the chamber.

32. In gas solidifying and pressing apparatus, a gas solidifying and pressing chamber having a discharge opening, a closure member for said chamber opening, said member movable to and from position closing said opening to seal the chamber gas-tight, means for moving said closure member and for maintaining the same in chamber sealing position against opening under the action of pressures within the chamber, means for supplying gas in fluidv form to the chamber when the latter is sealed by said closure member for conversion of a portion of the gas into a solid and a portion to a gas, means for withdrawing lthe unsolidified gas from the chamber, a pressing plunger in the chamber movable to press a mass of the solidified gas collected in the chamber against said closure member under sufiicient pressure to compress the solidified mass into a dense block.

33. In a gas solidifying and pressing apparatus, a solidifying and pressing chamber having one end thereof open, a closure head movable to close the open end of said chamber and to seal the chamber from the atmosphere, means for moving said closure head to and from chamber closing position and for maintaining said head in chamber closing position against pressures Within the chamber, a pressing plunger reciprocal in said chamber for pressing a mass of solidified gas in the chamber into a block against said closure head while the latter is held in chamber closing position by said means, said plunger formed for passage o'f gas therepast as the plunger is moved in the chamber, means for forcing said plunger into block pressing engagement with a mass of solidified gas in the chamber, and said closure head being movable to position opening the end of the chamber upon completion of the block pressing for removal of the block through the chamber open end.

34. In a gas solidifyingand pressing apparatus, a vertically disposed closed top and open bottom gas solidifying and pressing chamber, a vertically disposed fluid pressure cylinder below said chamber having a vertically reciprocal plunger therein, a chamber closing head mounted on the upper end of said pressure cylinder and vertically movable therewith between raised position closing tion,

the open bottom of the chamber and sealing the chamber from the atmosphere, and lowered position opening the bottom of the chamber, a pressing plunger vertically reciprocal in said chamber for pressing a mass of solidified gas in the chamber into a block against said bottom closure head when the latter is in raised chamber closing position, fluid pressure means for operating said pressing plunger, means for supplying gas in fluid form to the chamber for expansion to convert a portion thereof to a solid and a portion to a gas when the closure head is in cham: ber sealing position and the pressing plunger is in raised inactive position in the chamber, means for withdrawing the gas from the chamber during formation of the solid mass, and said closing head upon completion of a block by said pressing plunger being movable downwardly from closing position with remove the block from the chamber.

35` In a solidified gas pressing apparatus, the combination of a pressing chamber having an open end, a closure head for the open end of the chamber for closing the chamber and sealing the same from the atmosphere, said chamber and closure head being relatively movable to position the head in chamber closing position and in ,chamber opening position removed from the chamber, means for relatively moving the chamber and head to and from chamber closing 'position and for maintaining the head closed against pressures Within the chamber, means for expanding compressed gas in the chamber when closed by said head to form a mass of solidified gas in the chamber, a pressing plunger in the chamber operable to press a mass of solidified gas formed therein into a block against said closure member when the latter is held in chamber closing posiand means for operating said plunger.

36. In gas solidifying and pressing apparatus, a gas solidifying and pressing chamber having one end thereof open, a closure head movable between position closing the open end of the chamber to seal the chamber from atmosphere, and position removed from and opening the c amber end for discharge of material therefrom, means for moving said closure head between chamber opening and closing positions and for maintaining the head under suiiicient pressure when in closed position to overcome pressures within the chamber acting to force the head to open position, a pressing plunger reciprocal in the chamber toward and from said closure head and in normal inactive position disposed in the chamber spaced from said head, means for supplying a compressed gas to said chamber when the closure head is in chamber closing position and the pressing plunger is in normal inactive position to convert a portion of said gas into solidified form in the chamber between the plunger and pressing head, means for Withdrawing the unsolidified gas from the chamber during formation of the solidified gas therein, and means for forcing said pressing plunger toward a mass of solidified gas to press such mass into a block against the closure head, said closure head being movable after completion of the block pressing by said plunger to position removed from the chamber for unobstructed removal of the block from the chamber.

37. A gas solidifying and pressing apparatus, including, a closed expansion chamber, a compression chamber in gas-tight, unobstructed communication with the expansion chamber, means for expanding a compressed gas to produce an the block supported on the head to 'lli accumulation oi.' solidified gas in the compression to press the mass into a dense block of solidiiied chamber, a plunger arranged to compress the gas, and nally opening the chamber to atmos. solidied gas, and a movable head arranged to phere and removing the completed block thereform the closure for the compression chamber to from. se'al such chamber from the atmosphere and 39. The method of producing blocks of solid 5 against which the solidiiled gas is compressed by carbon dioxide from liquid carbon dioxide, which said plunger. i method includes supplying liquid carbon dioxide 38. The method of producing blocks of solidito a chamber that is closed to atmosphere and ed gas which includes the steps of, supplying a converting the liquid to solid and gaseous carliqueed gas to a closed chamber that is sealed bon dioxide in such closed chamber by expanw from the atmosphere and converting a portion sion oi.' the liquid carbon dioxide. collecting the of the liquefied gas to a solid and a portion solid carbon dioxide in the chamber while withthereof to a gas in the chamber by expansion, drawing the gaseous carbon dioxide from the maintaining the'chamber volume constant while chamber, maintaining a definite pressure in the expanding the liqueed gas and accumulating a closed chamber during formation and collection 15 mass of the solidied gas therein, withdrawing the of the solid carbon dioxide therein, shutting oil' unsolidified gas from the chamber during forthe supply of liquid carbon dioxide to the chammation and accumulation of the solidied gas ber ai'ter'a desired mass of solid has been colin the chamber, shutting oil.' the supply of liquelected in the chamber, then pressing the mass of fled gas to the chamber to 'stop production of solid solid to a dense block oi solid carbon dioxide in 20 and gas therein after a desired mass oi the solid the chamber, and nally opening the chamber and has been accumulated in the chamber, mechanremoving the block therefrom. ically applying pressure to the mass o1' solidied HARRY W. COLE. gas in the chamber while the chamber is closed MALCOLM W. MCLAREN.

DISCLAIMER 2,025,698 .-Harry W. Cole, New Rochelle, and Malcolm W. McLaren, Jackson Heigfits, N.. Y. Gas SOLIDIFYING APPARATUS. Patent dated Dec. 24, 1935. isclaimer filedv Jan. 14,- 1947, by the inventors and the assignee, .International Carbonia Engineering Oompany. A. y

Hereby enter this disclaimer to clams, 8, 14, 15, 18, 19, 23, 28, 29, 30, 31, 32,

33, 35, 36, .38 and 39 of said patent.

[Oficial Gazette February 18, 1947.]

accumulation oi.' solidified gas in the compression to press the mass into a dense block of solidiiied chamber, a plunger arranged to compress the gas, and nally opening the chamber to atmos. solidied gas, and a movable head arranged to phere and removing the completed block thereform the closure for the compression chamber to from. se'al such chamber from the atmosphere and 39. The method of producing blocks of solid 5 against which the solidiiled gas is compressed by carbon dioxide from liquid carbon dioxide, which said plunger. i method includes supplying liquid carbon dioxide 38. The method of producing blocks of solidito a chamber that is closed to atmosphere and ed gas which includes the steps of, supplying a converting the liquid to solid and gaseous carliqueed gas to a closed chamber that is sealed bon dioxide in such closed chamber by expanw from the atmosphere and converting a portion sion oi.' the liquid carbon dioxide. collecting the of the liquefied gas to a solid and a portion solid carbon dioxide in the chamber while withthereof to a gas in the chamber by expansion, drawing the gaseous carbon dioxide from the maintaining the'chamber volume constant while chamber, maintaining a definite pressure in the expanding the liqueed gas and accumulating a closed chamber during formation and collection 15 mass of the solidied gas therein, withdrawing the of the solid carbon dioxide therein, shutting oil' unsolidified gas from the chamber during forthe supply of liquid carbon dioxide to the chammation and accumulation of the solidied gas ber ai'ter'a desired mass of solid has been colin the chamber, shutting oil.' the supply of liquelected in the chamber, then pressing the mass of fled gas to the chamber to 'stop production of solid solid to a dense block oi solid carbon dioxide in 20 and gas therein after a desired mass oi the solid the chamber, and nally opening the chamber and has been accumulated in the chamber, mechanremoving the block therefrom. ically applying pressure to the mass o1' solidied HARRY W. COLE. gas in the chamber while the chamber is closed MALCOLM W. MCLAREN.

33, 35, 36, .38 and 39 of said patent.

[Oficial Gazette February 18, 1947.]