US1244530A - Superheater for boilers. - Google Patents

Description

E. G. MEIER. SUPERHEATER FOR BOILERS. APPLICATION FILED MAR 3.1917

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Patented 0st. 30,1917.

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" dwam E. C. MEIER.

SUPERHEATER FOR BOILERS,

APPLICATION FILED MAR. 3, I917.

Patented 905;. 30, 1091?. 5 DI'IEETS-$H ET 2 wwso.

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O, OO I 00 O OO E. C. MEIER.

SUPERHEATER FOR BOILERS.

APPLICATION FILED MAR. 3, 191?. 7 1,244,536. Patencefi m 30,191?

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E. 6. MEIER.

SUPERHEATER FOR BOILERS.

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Patented Oct. 30,1917.

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E. C. MEIER.

SUPERHEATER FOR BOILERS.

APPLICATION FILED MAR- 3, 191?.

Patented 0st. 30, 1917.

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iTNi E s A s F IQ EDWARD C. MEIER, O}? PHOENIXVILLE, BENNSYLVANIA,

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To all'whom it may concern:

I Be it known that I, EDWARD G. Mninma citizen of the 'United States, residing at Phoenixville, in the county of Chester and State of Pennsylvania, have invented certain new and useful Improvements in Superheaters for Boilers, of which the followiug' is a specification.

My invention consists of an improved su-v perheaterstructure for boilers.

In various types ofboilers employingsuperheaters, the water tubes, drums, and other elements which contain water to be converted intosteani, are heated by the hot gases and other products of combustion before the latter come in contact With the superheater. V In these constructions it is obvious that a great part of the heat is, absorbed before reaching the superheater.

For certain purposes where an exceptionally high temperature and pressure of superheated steam is not necessary, boilers of said types arepractical. However, where it is necessaryto secure and maintain superheated steam under high temperature and pressure, such for example as for use in connection with turbines, boilers ofthe above mentioned type have been found in efficient for the reason that-in order to secure suflicientheat for the superheater, it is necessary to constantly force the furnace to its fullest capacity and in some instances where superheated steam at extremely high temperature and 'pressure'is requlred, bollers of said type are entirely inadequate.

One object of my invention is to provide a boiler with a superheater structure which is made in such manner thatthe hot gases and products ofjcombustion will engage the tubes, or otherconduits for thesteamtobe superheated, prior to their passage to the water tubes or other elements which contain water to be converted into steam.

Another object is to provide a superheater housing which will act to prevent the depositjof the heavier particles of fuel in combustion, on the tubes or other portion of the superheater proper.

"A further object is to so construct said housing and other portion of the boiler that the hotgases will becaused to circulate through the superheater housing.

Anotherobject is to provide means for regulating the amount of the, products of combustion which circulate through the su:

Specification of Letters Patent.

from that shown in Fig. 1.

perheater housing and thereby regulate the degree of temperature and pressure of the superheated steam. 1

A still further object is to make my invention of simple construction and so that it can 'be quickly and easily installed and cleaned.

larged scale.

-Fig. 4C is a section'on the'line H of,

Fig. 3. p

Fig. 5 is a view of the same general na ture as shown in Fig. 1 but showing my invention' applied to what is known as a Three passboiler "in which thefiues from thesupe'rheater housing extend at an angle and open'into space within one of the passes "'ancli'betweentwo of the longitudinally extending baflles for a purpose hereinafter fully described."

Fig. 6 is a View of the same general type of boiler shown in 'Fig. 1, but inwhich certain of the elements relating to the superheating structure are differently positioned Fig is a fragmentary elevation on a reduced scale showing a modified form in the construction of one of the super-heater fines. Referring to Figs. lto'a inclusive, l represents a supporting structure which may be of brick and which forms a support for the, water legs 2 and 3 of a boiler having water tubes a which'communicate with the water legsQ and 3 and are/arranged atfa slight incline. from the horizontal.

lhe supporting structure 1 forms the inclosure for the boiler in whichfare located the grate bars 5, said grate bars attheir rear end terminating in a wall 6 whichleads transversely across the inclosure and extends to a height a short distance above the upper level of the grate bars 5; l W 1 The'wall 6 serves to divide the interior of Patented Oct. so, 1917.

Application filed March 3, 1917, Serial No. 152,179. V

described.

the inclosure into two compartments? and 8. The compartment 7 forms the fire box, while the compartment 8 forms what is known as the-combustion chamber, the

Battles 11. and12 are formed onand between certainot the tubese, and these baffles may be made up of a series ottile'positioned and constructed for example as shown and described in my prior United States Patent No] 1,188,967 N dated June 27, 1916."

The batliell is positioned on the lower tubes 4 and extend from the front water leg 2 rearwardly, stopping short of ithe water leg 3, so'that to provide a passage through which the products of combustion from the combustion chamber8can enter between the tubes 4.

The bafiie 12, onthe other hand, extends forwardly from the rear water jacket 3 and stops short of the front water leg 2 and is positioned adjacent the. uppermost tubes 4, thus compelling theproducts of combustion to pass. between the tubes e throughout their entire length prior to its entering into the chamber 13 which is formed between the baffle 12 and the upper or top covering 14.

The products of combustion after passing through the passage 12 eventually pass outwardly through the flue to the chimney and atmosphere.

In carrying out my invention, I provide two partitions 15and16, saidpartitions being spaced from the side walls 17 and 18 oft-he supporting structure 1. These partitions extendfrom the wall 6 rearwardly and intersect the rear wall'19 of said supa porting structure. Covers 20 and 21 are preferably made of porous fire brick and extend from the partitions 15 and 16 respectively to the sidewalls 17 and 18 and thus provide chambers 22 and 23*,it being noted that said covers also extend from the wall 6 to the wall 19.

By this construction, a central chamber 24 is formed between the partitions 15 and 16, this chamber being open at its top and directly communicating with the uppermost part of the combustion chamber 8, it being noted that saidpartitions 15 and 16 and the covers 20 and 21 are located in the combustion chamber 8.

Inlet ports or openings 25 and 26 are provided in the partitions 15 and 16 and communicate with the central chamber 24 and with the chambers 22 and 23. I also provideside fiues 27 and 28 within the walls 17 and18 and these flues attheir bottom portions communicate with the chambers 22 and 23 respectively. At their upper'ends, the fines 2 7- and 28 communicate 'with' the spacesf'betweenl the tubes d and between'th'e battles 11. and 12. Y

Superheaters and 30 have their heads 31 mounted within the rear wall 19, and their tubes project into the chamber and 23 respectively. The forward end of said. superheater tubes rest on'pedestals 33 which are located withinthe chambers 22 and As illustrated in Figs. 1; to inclusive, the tubes 32 of the superheater extend forwardly andstop short ot the inlet ports 25 and 26, itbeing noted thatsaid. inlet ports are formed in the extreme forward end of the partitions and I that, the flues 2? and 1 28 intersect the c hambers 22 and 23at the extremerear end thereof;

Dampers are pivotally mounted within the upper-ends of the tines 27.,and28.

and have rods 35v which extend beyond the outer surface of therear wall The superheaters 3O connect with the drum 9 and receive their steam therefrom through the medium of, a pipe 36, said pipe being broken away in Fig. 1 of the drawing, but itwill .be noted that this pipeconnects with theinlet passages 37 of the superheater, said superheater being provided with outlet pipes 38 for conducting the superheated steam. A doorway 39 is formed inrthe rear wall 19. and.communi cates with the lower por ti on otthe central chambe 24. This doorway permitsthe ready cleaning of the central chamber 24:.

My invention operates as follows: Thehot gases andproducts of combustion arising from thegrate' 5, pass over the top ofthe wall6; A portion otthesefgases pass rearwardly over the covers 20 and 21 and central chamber 251, 'andthen upwardly between the tubes at and battles 11 and. 12, and then through the openingprovided between the forward end of the bathe 11 and I the waterleg 2 to the chamber 13 and flue 10. This movement of the gases produces a suction through the side lines 27, and 28, and causes a portion of the hot gasesto pass downwardly into the central chamber 24 and then through the inlet ports 25 and, 26 into the chambers 22 ,and.23,, then through the fiues 27.,and 28 into thespace between the tubes 41 and the battles 11 and 12.1

The portion of gas which thus passes tremely high degree.

through. the chambers 22 and 23 isexcep- "tubes within saidchambers 22 and'23 are therefore heated to a very high temperature, thus heating the steam therein to an ex- By providing the chambers 22 and'23 with the partitions and 16 and the covers 20: and 21, they'are protected against the depositof dirt, sinceonly the lighter -particles of the products of combustion will pass through the inlet ports and 26, the

heavier dirt collecting on the tops of the,

covers 20 and 21,and at the bottom of the central chamber 24. c

The chamber 24 can be readily cleaned through the'doorway 39, and the dirt on-the covers 20 and 21 can be readily scraped therefrom through 'themedium of the firing door d0 which is formed in'the front wall 41 of the supporting structure. Also, by making the covers 20 and 21 of a porous fire brick, heat will penetrate them to the exclusion of the dirt and will thereby tend to more efliciently heat the super-heater tubes; r,

By the adjustment of the dampers 34, the amount of the gases circulating through the chamber-s22 and 23 can be regulated to suit various requirements as to the degree and pressure of the superheated steam, since it i will be noted that said dampers when moved will vary the amount of opening in the fines 27 and 28. I i

In Fig. 5, I have shown my invention in connection with what is known as a Three pass boiler including three baffles 4.2, 43, and 4%. In this construction I have shown municat'ing with the rear of the superheating chamber and opening directly into the space between the bafiies 43 and 44. In all other respects the construction shown in Fig. 5 is'substantially identical to that'described in connection with Figs. -1 to a in elusive, and I have therefore given similar parts corresponding reference numerals.

In Fig. 6, I have illustrated my invention in connection with a two pass boiler of the type shown in Fig. 1, but instead of having the inlet ports opening into the forward ends of the superheater chamber I have shown them entering the rear, one of said inlet ports being indicated by the reference numeral 16. In this instance, I form the side wall flue, indicated at T7, so that it intersects the forward part of the superheater chamber and also directly opens into the space between the upper baffle 48 andthe lower baffle 49.

those previously described in connection with F igs 1 to t inclusive, and I have therefore given similar parts corresponding reference numerals. In my present invention, the super-heater receives direct heat from the fire box, while the same is at a high temperature. This portion of the products of combustion, after heating the superheater tubes, passes betweenthe. tubes of the boiler proper and thereby acts to heat the latter in combma-.

tion with the gases which pass directly from the fire box to the boiler tubes, thus the products of combustion passing through the superheater chambers perform another function in that it assists in generating steam due to 1ts passage throughthe boiler tubes -p11013t0 passing off through the chimney.

It is well known that if tubes become burn out. Therefore, my present invention is valuable in that it protects the'tubes from dirt and also permits them to be heated by theproducts of combustion directly from the fire box. i

It willbe noted that in the several views of drawing, I have shown a well known type of superheater including the head 31. and the tubes 32, however, it will be understood that any form of superheater can be used in which the tubes can be extended into the chambers 22 and 23.

{Ileaning passages 50 are formed through the rear wall andon a level with the floor of the superheating chambers 2 and 23. These passages permit the removal of any dust whichcollects on the floor of the superheating chambers and are preferably closed at their outer ends by doors 51.

Fire brick doors '52 and 53 are located within the central chamber 24 and are slid able by rods 54: and 55 respectively which pass through the rear wall. These fire brick doors can be moved into position to'close the inlet ports or openings 25 and, 26 if it is desued to cut-off the superheating chambers 22 and 23 from the products of combustion.

F or example, if it is desired to remove the superheaters, it is only necessary to close the dampers 3% can also be closed, thus permit ting the removal of the superheaters withremove the sentire superheatcrs since they may be pulled outof the rear wall and being ata low level, they may be readily repaired and replaced.

In the form of my invention shown in Fig.

7, instead of having, the outlet flues extending at an angleupwardly such as shown in Fig. 0,1 form they flue substantially vertlcal "doors; 52' and 53 and the super-heaters may be bod1lyremoved,.1t being noted that the .with Fi g. 5, and I have therefore given similar parts like reference numerals.

One of the important features of my invention is the formation of the tines in connection with the outlets of the superheater chambers and to locate the dampers 3a within the fines where they do not receive the direct heat from the furnace. By this construction I can use comparativelythin dampers without fear of their being readily burned out. F 2 of the drawing shows these dampers located at the extreme upper ends of the fines 27 and 9.8, and the hot products of combustion are therefore compelled to pass entirely through the superheating chambers and fines prior to their engagement with the dampers. This renders my invention extremely practical since in various types of boilers, dampers have always been troublesome in view of the fact that they readily burn out and in order to prevent their burning out, it was customary to make them of heavy fire brick.

While I have described two superheaters and two covered chambers, it will be noted that if desired only one of the covered chambers can be used or more than two covered chambers can be used, however, in each instance I prefer to form the inlet opening in the partition which provides the covered chamber.

Vhile I have described my invention as taking a particular form, it will be understood that the various parts of my invention may be changed without departing from the spirit thereof, and hence I do not limit myself to the precise construction set forth, but consider that I am at liberty to make such changes and alterations as fairly come within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Let- ;ucts of combustion into said chamber, said means also having an outlet opening for said products of combustion leading from said chamber, anda superheater extending withinsaid chamber, substantially as described.

2. The combination with a boiler, of a superheater construction including 'means providing an elongated horizontally extending chamber arranged below the steam-generating elements of the boiler and substantially on a level with the fire box; thereof,

said means including a side wallhaving an chamber alongside of said superheaterchamher and with which said inlet opening communicates, said second chamber serving as 'a conducting passage for the products of combustion prior to their entering the superheater chamber. substantially as described. The combination with a water tube boiler, of means providing a superheater chamber arranged below the water tubes and.

substantially on a level with the firebox of the boiler, said means including a side wall having an inlet opening for laterally admitting the products of combustion into said chamber, and baflies interposed between the tubes of the boiler and extending longitudinally thereof, said first means providing an outlet flue, for the products of combustion from said superheater chamber, said flue having its outlet opening between said baffies, substantially as described. I

l. The combination in a boiler, of a fire bor. a combustion chamber adjacent thereto, a partition in said combustion chamber and spaced from a side wall thereof, a cover extending from the partition to the side wall and providing a superheater chamber, said partition having an opening therein for permitting the products of combustion to enter the superheater chamber from the side, means providing an outlet opening for the superheater chamber and a superheater extending within said superheater chamber, substantially as described.

5. The combination in a boiler, of a supporting structure including front, side, and rear walls, a fire box formed at one end of said structure, a combustion chamber formed in the opposite end of said structure, a wall extending transversely between the fire box and the combustion chamber, a partition extending from said latter mentioned wall to the rear wall of the supporting structure, said partition extending substantially parallel with one of said side walls and dividing the lower portion of the combustion chamber, a cover extending from said partition to one of said side walls and with the partition forming a superheater chamber, said partition having an opening therein for between the permitting entrance of the products of combustion from said combustion chamber into the side of said superheater chambeig'means forming an outlet for" 'said superheater chamber, and a superlieater extending with in said latter mentioned chamber, substantially as describeda 1 6. The combination in a water tube boiler, of a supporting structure including 'front side, and rear walls, a fire box formedat one end of said structure, a combustion cham-, ber formed in the opposite end of said structure, a wall extending transversely between the'fire box and the combustion chamber, a partition "extending from said latter mentioned wall'tothe rear wall of the suppor ing structure, said partition extending sub stantially parallel with one of said side Walls and dividing the lower portion of the combustion chamber, a cover extending from said partition toone of said side walls and, with the partition, forming a superheater chamber, said partition having an: opening therein for permitting entrance of the products of combustion from said combustion chamber into thesideof saidsuperheater chamberfmeans forming outlet for said superheater chamber, a superheater extending,within said latter mentioned chamber, means forming a flue-of comparatively small cross section, said flue. extending from the outlet opening of said superheater chamber and opening into the space water tubes, substantially as described. p 7 a 7. The combination in a water tube" boiler, of a? supporting structure including front,

side, and rearwalls, a fire box formedin said structure, a combustmn chamber ad] a.-

cent said fire box, a wall extending transversely between the fire box and the combnstion chamber, a partition extending from said transversely extending Wallto the rear wall of the supporting structure, said partition dividing the lower portion of the combustion chamber, a cover extending from 'said partitionto one of said side walls and with the partitiongforming a" superheating chamber, said partition having an opening therein for permitting entrance of the f products of combustion from said combustion, chamber into the side of said superheater chamber, water tubes arranged above "said fire box and combustion chamber, two

superimposed bafiles interposed between the water tubes extending longitudinally thereto to form a'passage for the products of combustion from said fire box, a superheater extending within said super-heater chamber, means: providing an outlet opening communicating with said ,superheater chamber, and a; flue extending from saidoutlet passage and having its entire outlet end leading into the space. between said bafiics, substantially as descr bed,

7 8. The combination in a boiler, of a. supporting structure including front, side, and rear walls, a. fire box formedi'n' said structure, a combustion chamber adjacent said fire box, a wall extending transversely be tween the the 'box and therombustion chamber, two partitions spaced from the side walls and extending between said transverse wall and the rear wall, covers extending from said partition to said side walls and thereby forming covered chambers, said partitions being spaced apart to form a central chamber which is open at its top and. communicating withthe combustion chamber,'inlet openings in said partitions and communicating respectively'with'the central chamber and the covered chambers, water tubes mounted above said combustion chamber, bellies spaced apart and arranged adja cent said water tubes, superheaters'extending within said covered cliambers,and fines ber, two partitions spaced "from the side" walls and extending between said transverse wall and the rear wallQcovers extending from said partition to said side wa-llsand thereby forming covered chambers, said partitions being spaced apart to form a central chamber which "is open at its top and communicating with the combustion chamber, inlet openings in said partitions and communicating respectively with the central chamber and the=covered chambers, water tubes mounted above said combustionchamber, baflles spaced apart and arranged adjacent said water tubes,"superhcaters extending within'said covered chambers, and fines communicating with said covered chambers" and opemng' into the space between said water tubes and between said bat les, substantially as described.

"10; The'combinatlon in a boiler, of asupporting structure including front, side, and" rear walls, affire' box formedin said strucmes combustion chamber adjacent said fire box, ,a wal-lfextending' transversely be. tween the fire box and the combustion chamber, two partitions'spaced from the side; walls and extending between said transverse 'wall and the rear wall, covers extending from said partition to said side .walls and thereby forming covered chambers, said partitions being spacedhapart to re central chamber which is open at its top alld communicating with the combustion, chamber, inlet openingsin said partitionsand communicating respectively with the central chamber. and the covered chambers, water tubes mounted above said combustion chamber, baffles spaced apart and arranged adjacent said water tubes, superheaters extending within said .covered-chambersfiues comgnunicating with said covered chambers and opening into the space between said water tubes, and dampers for regulating the passage of the products of combustion through said covered chambers, substantially as de ri ed e 11. The combination in a boiler, of a sup porting structure including front, side, and 7 rear walls,a fire box formed in said structure, a combustion chamber adjacent said,

fire, box, a wall extending transversely between the fire box and the combustion chamher, two partitions spaced from the side walls and extending between said transverse wall and the rear wall, covers extending from said partitions to said side walls and ,thereby forming covered chambers, said partitions being spaced apart to form a central 7 chamber which is open at its top and comfmunicating with the combustion chamber,

inlet openings in said partitions and comjmu nicating respectively with the central chamber and the covered chambers, water tubes mounted above said combustion chamber, baflies spaced apart and arranged adjacent said water tubes, super-heaters extending within said covered chambers, fiues communicating with said covered chambers and opening into the space between said water eltubespand dampers'interposed within said fines for regulating the passage of the products of combustion through said covered chambers, substantially as described. 7 m 12. The combination ina boiler, of a sup- 40 porting structure including front, side, and

rear walls, a fire box formed in said structure, a combustion chamber adjacent said fire box, a wall extending transversely between the fire box and the combustion chamber, two partitions spaced from the side gwa lls and extending between said transverse wall and 'tl16 161I wall, covers extending from said partition to said side walls and thereby forming covered chambers, said par- J titions being spaced apart to form a central .chamber whichis openat its top and communicating with the combustion. chamber,

i inlet openings in said partitions and com- M municating respectively with the central .phamberv and theucovered' chambers, water tube's mounted above said combustion cham- ;,ber, baffles spaced apart and arranged adjafcent said water tubes, superheaters extend- .ing-within said covered chambers, and fiues ingewith said covered chambersand opening ,mto the space betweensaid water tubes,

'jsubstantially as'described.

and between scrlbed.

,li'iffllhe combination in a boiler, of a suprear walls, a' fire box formed jincsaid structure-,n combustion chamber adjacent said fire box, a wall extending transversely between the fire box and the combustion cham: ber, two partitions spaced from the} side walls and extending between said transverse wall and the rear wall, covers extending from said partition to. said side walls and thereby forming covered chambers, said partitions 'being spaced apart to form a central chamber which is open at its topand communicating with the combustion chamber, inlet openings in said partitions and communicating respectively with the central said central chamber, substantially as described.

1st. The combination in a boiler, of a sup porting structure including front, side, and 'rearwalls, a fire box formed in said struchire, a combustion chamber adjacentsaid fire box, a wall extending transversely between the fire box and the combustion chamber, two partitions spaced from the side walls and extending between said transverse wall and the rear wall, covers extending from said partition to said side wallsaiid thereby forming covered chambers, said par- ,titions'being spaced apart to form a central chamber which 18 open at 1ts top and commun1cat1ng with the combustion chamber,

inlet openings in said partitions and communicat ng respectively with the central chamber andthecovered chambers, water tubes mounted above said combustion chamber, baflies spaced apart and arranged adjacent said water tubes, superheaters ext-end-' ing within said covered chambers, and fines formed in said side walls and communieating withsaid covered chambers andopening into the, space between said water'tubes the baifiies, substantially as, de-

15. A superheater inclo'su're for steam bollers'including a wall forming afpartition adjacent the combustion chamber of the boiler, said partition including an opening for laterally admitting the products of comlb ustion into the chamber provided by'the I inclosure, and a door for closing said openit ing, substantially as described.

60 formed insaid sidewalls and connnuuicat- 16. A superheater inclosurer for steam ,boilcrs including a wall forming a partition adjacent the combustion chamber of the boiler, said partitio nincluding an opening for laterally admitt ng the products of com-,

bustion into the chamber provided by the inclosure, and a door slidably mounted adjacent said opening and adapted to regulate the amount of products of combustion entering said compartment, substantially as described.

17. The combination in a boiler, of means providing a combustion chamber, bafiles located above said combustion chamber and spaced apart to provide a passage for the products of combustion, means providing a superheater chamber, an inlet opening in said superheater chamber communicating with the combustion chamber, and an outlet flue leading directly from the super-heater chamber and having its entire outlet end opening into the space between said baffles at a point Within the length thereof, substantially as described.

18. The combination in a boiler, of means providing a combustion chamber, bafiles located above said combustion chamber and spaced apart to provide a passage for the products of combustion, means providing a superheater chamber, an inlet opening in said superheater chamber communicating with the combustion chamber, an outlet flue leading directly from the superheater chamber and having its entire outlet end opening into the space between said baflies at a point within the length thereof, and a damper in said flue located in a position remote from said superheater chamber, substantially as described.

19. The combination in a boiler, of means providing a combustion chamber, baliles located above said combustion chamber and spaced apart to provide a passage for the products of combustion, means providing a superheater chamber, an inlet opening in said superheater chamber communicating with the combustion chamber, and an outlet flue leading directly from the superheater chamber and extending upwardly, said flue having its entire outlet end opening into the space between the baffles at a point within the length thereof, and a damper located adjacent the upper end of said flue, substantially as described.

20. The combination in a boiler, of a supporting structure, a fire boX, a combustion chamber directly adjacent the fire box, a partition in said combustion chamber dividing the lower part thereof, a cover extending from said partition to a side wall of the supporting structure to form a superheater chamber, said partition having a side opening therein to admit products of combustion laterally into the superheater chamber, means providing an outlet opening for said superheater chamber, a door for closing said first opening, and a superheater extending into said latter chamber, substantially as described.

21. The combination in a boiler, of a supporting structure, a lire box, a combustion chamber directly adjacent the fire box, a partition in said combustion chamber dividing the lower part thereof, a cover extending from said partition to a side wall of the supporting structure to form a superheater chamber, said partition having a side opening therein to admit products of combustion laterally into the superheater chamber, means providing an outlet opening for said superheater chamber, a superheater extending into said latter chamber, means providing a dust cleaning passage communicating with the superheater chamber, and a door for closing said passage, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EDWARD C. MEIER.

Witnesses,

F. H. MEIER, 7 N. JOHN NELSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C.

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