US1550991A - Gas producer - Google Patents

Description

. TREAT GAS PRODUCER me u A Fi lad Ilafy 5'. 1922 7 Sheets-Sheet 1 INVENTOR'" F. H. TREAT an s rnobbqsa Filed Kay .5. 12122 *r' Sheets-Sheet 2 f, INVENTQFI flaw; y,

Aug. 25, 1925.

- V F'. H. TREAT GAS .ERODQCER Filed May 5. 1922 7 Sheets-Sheet 3 mm mm;

F. H. TREAT GAS PRODUCER INVENTOR F. H. TREAT Aug- 25. 1925.

GAS PRODUCER Filed-14 w 1922 v sheets-sheet 1,550,991 F. H. TREAT GAS PRODUCER Filed May 5. 192.2 '7 Sheets-Sheet v Patented Aug. 25, W25.

if i FRANCIS H. TREAT, OF EAST CLEVELAND, O'HIO, ASSIGNOB T0 DUFF PATENTS COM- PANY, INCORPORATED, 0F PITTSBURGH, PENNSYLVANIA, A. CORPORATION OF PENNSYLVANIA.

GAS PRODUCER.

Application filed May 3,

To all whom 2'2 may concern:

Be it known that I, FRANCIS H. TREAT, a citizen of the United States, residing at East Cleveland, in the county of (luyahoga, State of Ohio, have invented a new and useful Improvement in Gas Producers, of which the following is a full, clear, and exact description.

The present invention relates broadly to gas producers, and more particularly to improvements in the construction and operation thereof whereby improved fuel feeding and distribution together with agitation of the fuel bed is provided.

It has heretofore been proposed to provide fuel feeding devices for producers adapted to deliver the fuel through openings extending substantially radially of the producer, or by feeding devices delivering to a bell for effecting prelin'iinary distribution of the fuel. Such devices, while used to a considerable extent. do not eifectan eflicient distribution of the fuel. The present invention overcomes certain objections to fuel feeding devicesof this character by providing a. plurality of fuel feeding de vices for a 'gas producer, each of which devices is adapted to initially deliver the coal directly to different portions or zones of the fuel bed.

The present invention also provides means whereby the amountof fuel delivered to each of the feed devices may be easily and independently varied as desired.

Still another object of my invention is to provide means for effectively agitating the different portions or zones of the fuel bed as the fuel is delivered thereto.

The foregoing and other objects of the present invention, together with their at tendant advantages will be readily apparent as the invention becomes better understood by reference to the accompanying specification and drawings forming a part thereof. The drawings are illustrative only of a preferred embodiment of the present invention and it will be understood that they do not define the limits of the invention, as changes may be made in the construction and operation without departing from the 1922. Serial No. 558,176.

spirit of the invention or scope of my broader claims.

in the drawings:

Figure 1 is a vertical sectional view, partly in elevation, through a gas producer embodying the present invention; I

Figure 2 is a transverse sectional view on the line IIII of Figure 1, looking in the direction of the arrows;

Figure 3 is a vertical sectional view, on an enlarged scale, on the line III-I1I of Figure 2, certain of the parts being illustrated in elevation;

Figure i is a partial transverse sectional view on the line IVIV of Figure 1, looking in the direction of the arrows;

Figure 5 is a detail side elevation of a portion of the present invention;

Figure 6 is a detail sectional View illustrating the means for effecting relative rotation between different portions of the producer;

Figure 7 is a vertical sectional view on the line VIL VH of Figure 1, looking in the direction of the arrows;

Figure 8 is a top plan view of a portion of the fuel feeding and distributing means, and

Figure 9 is a diagrammatic sectional view illustrating a portion of the feeding, distributing and agitating mechanism.

In accordance with the present invention, I may utilize aproducer body 2 of any desired construction having a suit-able gas offtake 3. Supported on the upper portion of the producer 2 and projecting inwardly therefrom is an annular cover member 4 fixed against rotation and provided with a series of poke openings 5 adapted during the operation of the producer to be normally closed by suitable closures 6 as is customary in this art.

The annular cover member 4: is preferably provided with a channel 7 adapted to form a water seal for the rotating portions of the producer top as will be more fully pointed out hereinafter. Projecting upwardly from the cover a, in any desired manner, are a plurality of spaced supporting members 9 which are preferably flanged at their upper ends to form a seat for the annular gear 10 which is secured thereto. Surrounding the annular gear 10 1s an annular track 11 which is adapted to support the weight of the rotating parts of the producer as will be more fully apparent hereinafter.

Projecting downwardly through the opening in the cover member at is a fuel feedlng distributer 12 having secured thereto and projecting radially thereof a plurality of spaced bearings 13 adapted to receive stub shafts 1st. On the outer end of each of these stub shafts is suitably mounted a coni cal supporting roller 15 adapted to engage and travel upon the annular track 11. These rollers maintain the fuel feeding distributer 12 in proper position and permit free rotation thereof. This distributer constitutes, in effect, a portion of the producer cover.

Carried by the distributer 12, and projecting upwardly therefrom, as illustrated in Figures 2 and 6, is a bracket 16 carrying at its upper end a. motor 17 for effecting relative rotation of the parts as required. This motor may be a variable speed motor of any desired type. Keyed to the armature shaft of the motor 17 is a driving pinion 18 which is adapted to mesh with and drive the first gear 19 of a suitable gear train. One of the gears of this train may comprise a friction clutch 20, as illustrated in Figure 6 whereby in case any of the parts become wedged, injury will be prevented. This gear train is adapted to transmit power to the bevel driving gear 21 which meshes with the rack 10, whereby as the motor 17 is operated the distributer 12 will be rotated at a speed which will vary as the motor speed is varied.

As illustrated more particularly in Fig ures 1, 4; and 9, the distributer 12 is provided with a plurality of substantially equidistantly spaced fuel feeding openings A, B and C. Each of these openings has cooperating therewith a back wall 23, formed in the distributer 12. These back walls each have different degrees of inclination, whereby fuel delivered to the fuel feed openings will be projected onto the fuel bed at correspondingly different distances from the cen ter thereof. The fuel feeding opening A has a substantially straight back wall 23 whereby fuel will be delivered to the fuel bed in the zone A, as illustrated in Figure 9, the fuel during discharge falling substan tially as indicated by the chain line a of Figure 1. In like manner, the openings B and C will distribute fuel respectively to the zones B and C, the fuel being discharged following the chain lines o and 0. The inclination of the back walls 23 of each of the feeding openings is preferably such that each of these openings will deliver fuel to a zone in the fuel bed corresponding substantially in area to the area of the total fuel bed divided by the number of fuel feeding devices. As illustrated herein, each of the zones A, B and C preferably represents one-third of the total area of the fuel bed. It will be apparent, however, that such an arrangement, while highly desirable, may be varied within the scope of the present in vention.

For delivering fuel to each of the fuel feeding openings there may be provided a separate feed chute 24 rigidly secured in any desired manner to the distributer 12 so as to rotate therewith. Each of the chutes 24: is adapted to receive fuel from a common constant source of supply carried by a stationary plate 25, of generally circular outline, having a plane upper surface. The fuel may be initially delivered to this plate by a conductor 26 having its longitudinal axis substantially coincident with the axis of rotation of the distributer 12. This conductor is preferably, although not necessarily, entirely supported from its upper end, such support, if desired, being furnished by the fuel bunker or hopper. It will be apparent that fuel fed through this conductor will automatically pile up on the plate 25 substantially as indicated by the chain lines cl in Figure 1 to maintain therein a constant quantity of fuel. This constant fuel feeding operation tending to maintain a constant quantity of fuel in the shape of a frustum of a cone having sides at an angle corresponding to the angle of repose of the fuel will continue so long as the conductor contains sufficient fuel to completely fill its cross section. The fuel is prevented from accidental spilling from the plate 25 b means of upstanding segmental guards 2t secured to and extending between the walls of adjacent chutes 24:. For transferring the fuel from the plate 25 to each of the chutes, I have illustrated each of the chutes as provided with a measuring means comprising a curved scraper 28 projecting inwardly across a portion of the plate 25. Each of these scrapers has an adjustable connection 29 with its corresponding chute 24 whereby the position of the scrapers may be independently varied as desired to measure or vary the amount of fuel transferred thereby to the respective chutes during the relative rotation between the scrapers and the plate These scrapers sufliciently agitate the fuel to cause the same to tend to continuously flow outwardly and fill any voids left by the removal of fuel by the scrapers. As these scrapers in actual use revolve comparatively slowly I have found that the fuel will actually fiow closely behind them to restore the angle of repose.

I have found that the plate 25 may be con veniently supported in the desired position by providing on the lower surface thereof ll t. bi r' t bl til Ll til.

an annular conically faced track adapted to be engaged by and supported on conical rollers 31. These rollers 31 are preferably equi-distantly spaced around the track 30, and correspond in number to the number of feed chutes. Each of the rollers 31 may be carried by a two bearing shaft 32. These shafts are journaled at one end in their respective feed chutes, and at their outer ends are journaled in the uprights 33. Mounted on the shafts 82 are spur gears 34 constituting the upper gear of gear trains as clearly indicated in Figures 1 and 7. The lower gear 35 of each gear train is preferably splined to the hollow hub 36 of a rotating pocketed fuel passing and gas sealing member 37. The pocketed members 37 are each adapted to rotate in pockets 38 formed in each of the chutes 24, and are provided with heads 39 lying in the planes of the front and rear walls of the chutes. Extending through the hollow hubs 36 of the members 37 are adjustable tie rods 40 adapted to be secured to the uprights 33 and each having a suitable thrust bearing on its outer end to maintain the same in proper position. On its outer end each of the members 37 carries a bevel gear 41 adapted to mesh with the an nular rack 10.

Due to this construction, it will be apparent that as the distributer 12 is rotated the members 37 will also be continuously rotated by reason of the engagement of the bevel gears tl with the stationary annular rack 10. This rotation will be transmitted through the respective gear trains to the supporting rollers 31. The number and arrangement of gears together with the gear ratios may be so proportioned that the rollers 31 will be rotated backwardly at a pcripheral speed corresponding with the peripheral speed at which the distributer 12 is rotated, or at a speed which is greater than that of the distributer. In this manner the plate 25 will be either maintained in stationary position to permit the fuel to be removed therefrom by the scrapers 28, or will have a tendency to advance and meet the scrapers.

This construction is desirable as it provides an adequate support for the plate 25 and maintains it in proper relationship to the conductor 26 without the provision of any supporting or tying members extending between the plate and the conductor. This provides an unobstructed space for the fuel flow from the lower end of the conductor, and for the operation of the scrapers.

On the conductor 26 are mounted collector rings 42 suitably insulated and adapted to be connected in any desired manner to a suitable source of current. Cooperating with these collector rings, as illustrated in Figure 5, are brushes 43 which are electrically connected by a suitable cable 44 with the motor 17 for continuously supplying current to the motor during the operation of the gas producer.

While the mechanism heretofore described is effective for producing an efiicient initial distribution of the fuel within the producer it is highly desirable to provide cooperating means for agitating the fuel bed. For this purpose, 1 preferably provide a series of pokers A B and C Each of these pokers comprises an angular body portion of generally L-shape. Each of the ofiset poker portions carries a plurality of agitating lingers 46 adapted to project downwardly into the fuel bed. The vertical portion of each of the pokers extends upwardly through a radial opening in the distributer 12. The radial opening a has guide lugs 47 projecting inwardly from opposite sides thereof adjacent the inner end of the opening. The opening 6 has similar guide lugs 47 projecting inwardly from opposite sides thereof at an intermediate portion, while the guide lugs 47 project inwardly from the sides of the opening 0 adjacent the outer end thereof. These respective guide lugs are adapted to cooperate with oppositely disposed ribs l8 formed on the vertically extending portions of the agitating pokers, whereby rotation of the pokers relative to the distributer is prevented. Due to this arrangement it will be apparent that the agitating fingers 46 of the respective pokers are adapted to travel in concentric orbits, the radii of which vary in accordance with the zone which the particular poker is designed to agitate. The number of pokers preferably corresponds to the number of fuel feeding openings in the distributer whereby an agitating poker is provided for each of the fuel feeding Zones.

By having a plurality of pokers, I am enabled to provide a sui'lioient number of agitating fingers to effectively break and agitate the fuel bed without any objectionable tendency of these fingers to push the fuel bed bodily ahead such as is the case where the total number of fingers is all provided on a single poker, due to the closer spacing of the fingers.

Rotatably surrounding the conductor 26 is a pan 49 comprising a plurality of concentric con'ipartments. Each of these compartments is adapted to have water supplied thereto by suitable water connections 50, each of which may be independently controlled to vary the amount of water delivered thereby to the compartments 011 the pokers. For causing the pan 49 to rotate with the distributer 12 I may support the same on a plurality of angular supports 51 secured at their lower ends to the bearings 13, as illustrated in Figure 2, and at their upper ends to the lower side of the pan 49, as indicated in Figure 5. For delivering coo1- ing water from the respective compartments of the pan 49 to the respective pokers, there may be provided separate pipe connections 52 for each of the pokers. Each of the connections 52 is provided at an intermediate point with a telescopic joint 53, to permit vertical adjustment of he pokers, and the connections are arranged to discharge water initially in the lower portions of the pokers as illustrated in Figures 1 and 8. After filling the pokers the cooling water overflows therefrom through outlet connections 54; on to caps 55 and thence into the hollow interior of the distributor 12. From the interior of the distributor the water passes into the channel 7 through suitable openlugs 12 (Figures 1 and In this manner the desired water level for sealing purposes may be automatically maintained, and the necessary degree of water cooling effected.

As it is frequently desirable in constructions of this character to adjust the pokers vertically, I secure to the upper end of each of the pokers a radially extending arm 56, these arms being of different lengths in accordance with the position of the poker, as clearly shown in Figure 2. At their outer ends the arms 56 are provided with interiorly threaded nuts 57 adapted to cooperate with threaded adjusting screws 58. The upper end 59 of each of these adjusting screws may be so shaped as to facilitate the engagement therewith of suitable means for rotating the same, while the lower ends may be formed with heads 60 held in place by removable housings 61. By this means each of the pokers may be independently adjusted to the desired vertical position, the ribs as permitting such adjustment. In some cases it may be desirable to disconnect the housings 61 and permit the agitators to rest by gravity on the fuel bed and thereby automatically adjust their positions in accordance therewith.

If, for any reason, it is desired to remove any of the pokers, this may be easily accomplished by disconnecting the water supply connection 52 for that poker and disconnecting the required housing 61. When this has been done, the desired poker may be raised upwardly with its water seal cap 55 through the radial opening in the distributer 12. This requires only a momentary interruption of the producer operation.

If desired, it will be apparent that the lower surface of the annular track 30 on the plate 25 may be roughened, or provided with teeth to increase the friction existing between the same and the supporting rollers 31, whereby rotation of the plate 25 will be positively prevented. In such cases, the surfaces of the rollers 31 may be correspondingly shaped as required.

The advantages of the present invention arise from the provision of improved means for feeding, distributing and agitating the fuel whereby efficient operation of the pro ducer is insured.

I claim:

1. In a gas producer, a plurality of fuel feed devices, a fuel support common to all of said devices, means for carrying said support by said devices, means maintaining a constant supply of fuel on said support, and separate fuel feeding means for transferring fuel from said support and delivering the same to each of said devices, substantially as described.

2. In a gas producer, a plurality of fuel feed devices, afuel support common to all of said devices, means for carrying said support by said devices, means maintaining a constant supply of fuel on said support, and separate adjustable fuel feeding means for delivering fuel from said support to each of said devices, substantially as described.

In a gas producer, a plurality of fuel feed devices, means for separately feeding fuel to each of said devices, and a separate agitating poker for separately acting upon the fuel as delivered by each of said devices, substantially as described.

4. In a gas producer, a main body, a distributer having a plurality of distinctive feeding means adapted to deliver to Zones different distances from the center of the producer, means for producing relative rotation between said body and said distributer, a plurality of fuel feeding devices, and separate adjustable fuel feeding means for delivering fuel to each of said devices all delivering to said distributor, substantially as described.

5. In a gas producer, a main body, a distributor having a plurality of distinctive feedin means adapted to deliver to zones different distances from the center of the producer, means for producing relative rotation between said body and said distributer, a plurality of fuel feeding devices, and separate fuel feeding means for delivering fuel to each of said devices all delivering to said distributor, substantially as described.

6. In a gas producer, a bot y, a distributor having a plurality of distinctively differentfuel feeding means, means for producing relative rotation between the body and distributor, a plurality of fuel receiving and feeding devices, means for operating such devices, separate fuel feeding means for delivering fuel to each of said devices, and a common constant source of supply for all of said means, substantially as: described.

7. In a gas producer, a body, a distributer, means for producing relative rotation between the body and distributer, a plurality of fuel feed devices, separate fuel feeding means for delivering fuel to each of Y tart till i i il l 'il.

said devices, and a common source of supply for all of said means carried by said devices for rotation relatively thereto, said means being individually adjustable for delivering varyingamounts of fuel from said common source of supply to each of said devices, substantially as described.

8. In a gas producer, a distributor con structed to initially project separate streams of fuel onto the fuel bed in separate zones lying at different distances from the center of the fuel bed, a common automatically measured constant source of supply, and means for delivering measured quantities of fuel from said supply to said distributor, substantially as described.

9. In a gas producer, a plurality of fuel feed devices each. adapted to initially deliver fuel to the fuel bed in zones lying at different distances from the center of the fuel bed, a fuel support common to all of said devices, means for maintaining a constant supply of fuel on said support, and separate means for feeding fuel from said support to each of said devices, substantially as described.

10. In a gas producer, a fuel supporting member, means for maintaining a constant amount of fuel on sai member, a plurality of fuel feed devicesffipa'ff ately transferring fuel from said member to said devices, and means for operating said transfer means, substantially as described.

11. In a gas producer, a fuel supporting member, means for maintaining a constant amount of fuel on said member, a plurality of fuel feed devices, separate independently adjustable means for delivering fuel from said member to each of said devices, and means carrying said supporting member for operating said fuel delivery means, substantially as described.

12. In a gas producer, a. fuel supporting plate, means engaging said plate at a plurality of spaced points for carrying the same, a plurality of fuel feed devices cooperating therewith, means for producing relative rotation between said plate and said devices, and means cooperating With said plate for delivering fuel to each of said devices during such relative rotation, substantially as described.

13. In a gas producer, a plurality of fuel feed devices, each adapted to separately discharge fuel at a different distance from the center of the fuel bed, separate means for agitating the fuel delivered by each of said devices, and means for operating said agitating means to effect fuel distribution, substantially as described.

14. In a gas producer, a plurality of fuel feed devices, each adapted toseparately discharge fuel at a different distance from the center of the fuel bed, separate means for agitating the fuel delivered by each of said devices, each of said means being effective on different portions of the fuel bed, and means for operating said agitating means to effect fuel distribution, substantially as described.

15. In a gas producer, a body, a distributer, said distributer having a plurality of fuel feed openings therethrough, each of said openings having a Wall portion of different inclination from the corresponding wall portions of the other openings, a separate fuel feeding chute for delivering fuel to each of said openings, a common fuel supporting plate for all of said chutes, and means for engaging the fuel on said plate and transferring the same from said plate to said chutes, substantially as described.

16. In a gas producer, a body, a distributer, said distributer having a plurality of fuel feed openings therethrough, a separate fuel feeding chute for delivering fuel to each of said openings, a common fuel supporting plate for all of said chutes, individually adjustable means for transferring fuel from said plate to each of said chutes and means carried by each of said chutes for supporting said plate, substantially as described.

17. In a gas producer, a body, a distributer, said distributor having a plurality of fuel feed openings therethrough, a separate fuel feeding chute for delivering fuel to each of said openings, a common fuel supporting plate for all of said chutes, means for engaging the fuel on said plate and transferring the same from said plate to said chutes, and a separate agitating means for separately agitating the fuel delivered through each of said openings, substantially as d scribed.

18. In the method of delivering fuel to gas producers, the steps consisting in dividing a supply of fuel into distinct and separate streams, interrupting each of the streams to prevent escape of gas from the producer, and separately delivering the streams to a plurality of concentric zones of substantially equal areas constituting the entire area of the fuel bed, substantially as described.

19. In the method of delivering fuel to gas producers, the steps consisting in maintaining a common constant source of supply, dividing said supply of fuel into distinct and separate streams, separately delivering the streams to a plurality of concentric zones of substantially equal areas and constituting the entire area of the fuel bed, and varying the amount of fuel in each of said streams as desired, substantially as described.

20. In a method of delivering fuel to gas producers, the steps consisting in dividing a supply of fuel into distinct and separate streams, separately delivering the streams to a plurality of concentric zones of substantially equal areas constituting the fuel bed, and varying the amount of fuel in each of said streams as desired, substantially as described.

21. In a gas producer, a plurality of fuel feeding devices, a fuel supporting member carried by said devices, scrapers extending over said member for delivering fuel to each of said devices, and means for producing relative rotational movement between said member and said scrapers, substantially as described.

22. In a gas producer, a plurality of fuel feeding devices, a fuel supporting member carried by said devices, scrapers extending over said member for delivering fuel to each of said devices, means for independently adjusting each of said scrapers, and means for producing relative rotational movement b tween said member and said scrapers, substantially as described.

23. In a gas producer, a plurality of fuel feeding devices, a fuel supporting member carried by said devices, means for maintaining a constant quantity of fuel on said member, scrapers extending over said member for delivering fuel to each of said devices, and means for producing relative rotational movement between said member and said scrapers, substantially as described.

2 1. In a fuel feed for gas producers, a substantially fiat fuel supporting member, means for delivering fuel thereto, means for transferring fuel therefrom in separate streams, and means for receiving the fuel transferred therefrom, and means for engaging each stream to prevent the escape of gases and delivering measured quantities of the fuel to the producer, substantially as described.

25. In a fuel feed for gas producers, a supporting member, means for maintaining a substantially constant amount of fuel thereon, means extending into the fuel on said means for transferring fuel therefrom in divided streams, and means for receiving the fuel transferred therefrom and initially delivering the same to the producer at different distances from the center thereof, sub stantially as described.

26. In a fuel feed for gas producers, a supporting member, means for deliveri. fuel thereto, a plurality of scrapers movable relatively thereto for transferring fuel in measured quantities therefrom, and means for receiving the fuel transferred therefrom and delivering the same in measured charges to the producer, substantially as described.

27. In a fuel feed for gas producers, a substantially flat supporting member, means for delivering fuel thereto, means extend ng over said member for transferring fuel therefrom, means producing relative rotation between said member and said means,

means forming a seal for receiving the transferred fuel and discharging the same periodically in measured charges into the producer, and means effecting a distribution of said fuel Within the producer, substantially as described.

28. In fuel feed for gas producers, a substantially fiat fuel supporting member, means for delivering fuel thereto, means to prevent the spilling of fuel therefrom, means projecting over said member from one edge thereof for transferring fuel therefrom, and means for producing relative rotational movement in the plane of said member between said member and said last mentioned means for effecting the removal of fuel from said member, substantially as described.

29. In a fuel feed for producers, a substantially flat supporting member, means for delivering fuel thereto, a scraper extending over said member from one edge thereof for transferring fuel therefrom, and means for producing relative rotational movement in the plane of said member between said member and said scraper for effecting transfer of fuel from said member, substantially as described.

30. In a fuel feed for gas producers, a substantially fiat circular fuel supporting member, a fuel feeding chute a scraper carried by said chute and projecting over said member to engage fuel thereon, and means for moving said scraper around said member, substantially as described.

31. In a fuel feed for gas producers, a substantial y flat circular fuel supporting member, a scraper projecting over said member to engage fuel thereon, and supporting means for said member for rotating said member against the scraper, substantially as described.

32. In a fuel feed for gas producers, a substantially flat circular fuel supporting member, a scraper projecting over said member to engage fuel thereon, and means for rotating both the fuel supporting member and the scraper in opposite directions, substantially as described.

33. In a fuel feed for gas producers, a fuel conductor, a circular plate below said conductor receiving fuel therefrom, said fuel spreading out upon said plate substantially as determined by the angle of repose of the fuel, means preventing the spilling of fuel from the plate, scraping means extending inwardly over a portion of said plate for transferring fuel therefrom, and means producing relative movement between the periphery of said plate and said scraper, 125

substantially as described.

In a fuel feed for gas producers, a fuel conductor, a circular plate below said conductor receiving fuel therefrom, said fuel spreading out upon said plate substantially as determined by the angle of repose 130 of the fuel, scraping means extending in- Wardly over a portion of said plate for trans- 1 ferring fuel therefrom, and means producing relative movement between the periphery of 5 said plate and said scraper, said means forming a rolling support for said plate, substantially as described.

35. In a fuel feed for gas producers, a fuel supporting plate, fuel delivery means therefor, a rolling support for said plate, scraping means carried by said rolling support and projecting over the plate, and means for bodily rotating said support and said scraping means, substantially as described.

In testimony whereof I have hereunto set my hand.

FRANCIS H. TREAT.

Certificate of Correction. 4 It is hereby certified that in LettersPatent No. 1,550,991, granted August 25,

- 1925, upon the application of Francis H. Treat, of East Cleveland, Ohio, for an improvement in Gas Producers, an error appears in the printed specification requiring correction as follows: Page 5, line 30, claim 10, before the Word separately insert the Words means for; and that the said Letters Patent should be read With this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 13th day of October, A. D. 1925.

[SEAL] KARL FENNING,

Acting Gammz'ssz'oner of Patents.

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