US947838A - Metal-frame screen. - Google Patents

Metal-frame screen. Download PDF

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US947838A
US947838A US45596808A US1908455968A US947838A US 947838 A US947838 A US 947838A US 45596808 A US45596808 A US 45596808A US 1908455968 A US1908455968 A US 1908455968A US 947838 A US947838 A US 947838A
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frame
screen
members
walls
cloth
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US45596808A
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Stephen W Mcgrath
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    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/32—Arrangements of wings characterised by the manner of movement; Arrangements of movable wings in openings; Features of wings or frames relating solely to the manner of movement of the wing
    • E06B3/34—Arrangements of wings characterised by the manner of movement; Arrangements of movable wings in openings; Features of wings or frames relating solely to the manner of movement of the wing with only one kind of movement
    • E06B3/42—Sliding wings; Details of frames with respect to guiding
    • E06B3/44—Vertically-sliding wings

Definitions

  • My invention relates to metal frame screens of the box-frame type shown and described in Letters Patent of the United States No. 767,487, granted W. E. Monroe, August 16, 1904, and its object is to improve upon the screen shown and described in that stent, and the invention will be readily unerstood from the following description and .claims and from the drawings, in which Y latter:
  • Figure 1 is a front elevation of a metalframe Window-screen embodving my inven-V tion, the same bein partly broken away and partly in section or better illustration of parts, also showing the friction-spring at the side of the frame in assumed position in dotted lines, the window-frame being also indicated in dotted lines and broken away.
  • Fig. 2 is a perspective View of one of the corners of the frame in separated relation.
  • Fig. 3 is a cross section of my improved device taken on the line '3-3 of Fig. 1 but showing screen-cloths at both sides of the screen.
  • Fi 4 is a cross section of the parts shown in 1g. 3, taken on a similar line, butl showing the same in separated relation.
  • Fig. 5 is a detail in cross section on the line 5 of Fig.
  • Fig. 6 is a detail in edge relation showing the friction-spring i in place.
  • Fig. 7 is a vertical section of the same on the-line 7-7 of Fig. 6, and Fig. 8 is a cross section of the saine on the line S-B of Fig. 6.
  • the Stiles 1 and rails 2 of the screen each comprise an inner frame-member 3 and an outer frame-member 4, both of which are of substantial U-shaped channel form 1n cross section, with the Walls of the channels exl being formed respectively 1n the outer corwith the screen-cloth when assexnb-ed for:
  • the inner frame-member comprises a. base 5 and walls 6 6, the latter extending outwardly from the respective sides of'thebase.
  • the outer frame-member comprises a base 7 and walls 8 8, the latter extending ⁇ in- Wardly from the respective sides of the base.
  • the walls of these frame-members preferably extend substantially radial of the screen when assembled.
  • ⁇ utwardly extending beads 9 9 are between the base 5 and respective Walls 6 of the inner frame-member, being formed up from the sheet metal of which the inner frame-member is composed.
  • Channels 10 are thus formed, in the ends of which, at the corners of the screen, limbs 11 11 of inner reinforce corner pieces l2 are received.
  • These reinforce cornerieces are preferably formed of metal Whici lits the channels and which is bent for forming the limbs, which are substantially at Arightangles to each other.
  • the limbs are received in the channels of the inner frame-members for reinforcing the screen at the corner thereof.
  • the outer ends of the Walls 6 are preferably bent inwardly as shown at 13, being preferably bent back upon the walls and forming strengthening edges for the same.
  • the walls 8 of the outer frame-members may be provided with inwardly projecting beads 16 adjacent their bases. These beads serve the purpose of strengthening the outer members.
  • the inner frame-members are preferably mitered at the corners, as shown vat, 21, and the outer frame-members are preferably mitered at the corners, as shown at 22.
  • the respective walls and extensions of the outer corner-piece are provided With inwardly extendin beads 27. The beads 27 are received within the outer grooves of the beads 16.
  • Rivets 29 pass through the outer cornerieee and the walls of the outer and inner rame-members for securing the parts together, recesses 30 31 32 ner-piece, and in the walls of the outer and inner frame members for accommodating the rivet-heads, it being understood that the screen-cloth, shown at 33, will have been seaired in place before the frame is riveted together, und, if desired, one or more rivets, as chown at 34, may be passed through the Patented Feb. 1, 1910.
  • the inner reinforce corner-pieces are received in the ends of the channels 10 at the respective ends of the Stiles and rails f forming the corners.
  • these inner frame-members respectively bei ing preferably a one-piece structure for the respective .stiles and rails, thereby forming i an inner frame for the sei-een.
  • the walls of the inner frame-members preferably diverge rom each other slightly as indicated in Fifi'.
  • the screen-cloth is received about the outer ends of these diergng walls and bent inwardly as shown at The inwardly bent end of the screen-cloth is received within the channel of the inner traine-member if desired.
  • 41 il represent friet]oli-sprung. ⁇ one or These i more if which may be employed.
  • spring. are shown as leaf-springs and are respectively received through slits 2 t3 t-l in the base o" one of the outer frame-members. whereby an f nter strap l5 and an inner strap 4G are formed. between which the frictionspring is received. the heel -li' of said spring being received under the hase of said outer l
  • the said friction-springr A frame -1 member. extends outwardly away from the screencloth iii a curve whose convexity is presented toward the side of the screen-frame.
  • Said spring is preferably provided with au inward exten- ;Y sion 4S. which projects through an aperture E 49 in the base of .said outer frame-member. there being a toe In.) at the inner end ol said extension inside said outer l'ra11W-member. whirh i ⁇ adapted to contact the inner 'lace of the base ot' .said outer traine-mendier. thereby limiting the outward projection of l ⁇ aid spring and holding said spring in' place under tension. the tension of said sprinpr Q locking the same in place in the .slits and avoiding necessity :if other fastening iueans.
  • a metal-frame screen of the character deseribed.
  • said trame-members comprising opposed stile and rail lengths.
  • the said g lengths of said members being of substantial U-.shapcd channel forni in cross-.section vcomprising a base and side walls having months. presented toward ich other and suhstantialli parallel to the plane ofsaid screencloth.
  • the said stile and rail lengths of said i inner frauie-ineniln-r eat-li having an outwardly projectingr bead exteudin r longituddinalljr thereof adjacent its base.
  • said screencloth being' curled over said heads and clamped between the adjacent side walls at one of the sides' of ⁇ 4aid frame-nienihers.
  • said srreen-elotli being stretched between the i heads of opposed lengths of said inner frmne-iueinlier so that the plane of .said screen-cloth between said beads will be eo- V incident with the outer faces of the said heads for locating .said .screen-cloth between said heads of said opposed lengths of said inner fi'aini ⁇ -niendwr to one side ot' the frame of said sei-een, substantially as described.
  • the' sant beads being respeet i ⁇ 'el located betweenthe bases of the lengths of that frame-inemfralne-members, and said screen-cloth being located between the free edges of said sidewalls and beads at one of theV sides of said frame-members and stretched bet ⁇ 'een.the bends of o )posed stile and rail lengths of said inner rameanexnber, the said stretched portion of.said screen-cloth -extending outwardly beyond said beads and side-walls, substantially as described.
  • said stile and rail lengths of said outer trame-member having' inwardl) projectinw beads adjacent their bases, the .said beats on one of said frame-members beingin the lateral planes of the side-walls ot' the other of said frame-members.
  • said sereen-clotb being received between said opposed side-walls and beads at one of the .sides of said frame-members and stretched between the beads of opposed stile and rail lengths of .said inner frame-member for leating the plane of said stretched portion of said sereen-eloth when extended to one side of said inner -frame-member outside saidl inner f ranie-member. substantially as described.
  • metal-frame screen of the character described comprising in combination stiles and rails, having joints at the corners of said screen, said stiles and rails embracing opposed inner and outer frame-members, a sereen-cloth, said frame-members being of substantial channel form comprising a base and opposed side-walls, said opposed sidewalls being at the respective sides of the bases.
  • said opposed side-walls at: one of said sides being spaced from said opposed side walls at; the ⁇ other of said sides, said inner frame-member being provided with an outwardly project-ting bead extending longitudinali) thereof and bent from the metal of which said inner tranne-metaler is composed t'or forming ⁇ an inner channel ⁇ inner corner pieces respeetivelv having' limbs at substant tial right-angles to each other received bv said channels, in said :stiles and rails at the l resina-tive corners of said screen, and outer iecting heads.the .said beads extending lungi ⁇ zorlie1-pieees .received over aid 'joints at sai-l eorners.
  • each of said inner traine-meinters having n bend at each side ot' its base formed therefrom for forming an inner channel, and inner reinforce corner-pieces respectively having limbs at substantially right angles to. each other received in said channels of said respective stiles and rails at the corners of the sei-een. substantially as described.
  • a sheet-metal frame-member provided with slits for forming straps. and a leaf friction-spring, one end of which is received b v said slits for beingl recefved alternately under and above said straps of said sheet-metal frame-member at ditferent points.
  • the other end of said leaf frictionspring extending ontwardljvy on a curve whose convexity is presented toward said frame-member and acting when tiexed out of normal position to bind said first-named end of said spring against said straps.
  • a metal-frame screen the combination of a :sheet -metal frame-member provided with slits for forming straps. a leaf friction-spring, one end of which is received by said slits for being received under and above said straps of said sheet-metal framexnember at diii'erent points, the other end of said leaf friction-spring extending out-f wardly 011 a curve whose convexity is presented toward said trame-member and acting when flexed ont of normal position to bind said first-named end of said spring against said straps, said leaffl'ictionspring having an inward extension and said metal frame-member having an aperture through which said extension is received, and limit- -leaf friction-spring adapted to contact the slideway for said screen, saidA frame member being provided with slits through which one 4.

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  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Curtains And Furnishings For Windows Or Doors (AREA)

Description

Y. t s. W. MOGRATH.
` MBTAL FRAME ssamm.
APPLICATION FILED 00123, 1908.
l 9&7838. K Patented Feb. 1,19l0.
l 2 SHEETS-SHEET 1. 'A f7.1.
S. W. MGGRATH.
METAL FRAME SCEEFE. APPLICATION H LBD ooms, 190s.
Patented Feb. 1,1910.
2 SHEETS-SHEET 2.
M Wwf..
STEPHEN W. NOGBATH, OF CINCINNATI, OHIO.
METALFRAME SCREEN.
Specification of letters Patentl Application filed October 3, 1908. Serial No. 455,969.
To all whom 'it lmay concern:
Be it known that I, STEIHEN lV. MCGRATH, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful -Improvements in Metal-Frame Screens, of which the following is a specification.
My invention relates to metal frame screens of the box-frame type shown and described in Letters Patent of the United States No. 767,487, granted W. E. Monroe, August 16, 1904, and its object is to improve upon the screen shown and described in that stent, and the invention will be readily unerstood from the following description and .claims and from the drawings, in which Y latter:
Figure 1 is a front elevation of a metalframe Window-screen embodving my inven-V tion, the same bein partly broken away and partly in section or better illustration of parts, also showing the friction-spring at the side of the frame in assumed position in dotted lines, the window-frame being also indicated in dotted lines and broken away. Fig. 2 is a perspective View of one of the corners of the frame in separated relation. Fig. 3 is a cross section of my improved device taken on the line '3-3 of Fig. 1 but showing screen-cloths at both sides of the screen. Fi 4 is a cross section of the parts shown in 1g. 3, taken on a similar line, butl showing the same in separated relation. Fig. 5 is a detail in cross section on the line 5 of Fig. 1, showing the frame in assembled relai tion with the inner reinforce corner and the i outer corner in place. Fig. 6 is a detail in edge relation showing the friction-spring i in place. Fig. 7 is a vertical section of the same on the-line 7-7 of Fig. 6, and Fig. 8 is a cross section of the saine on the line S-B of Fig. 6.
The Stiles 1 and rails 2 of the screen each comprise an inner frame-member 3 and an outer frame-member 4, both of which are of substantial U-shaped channel form 1n cross section, with the Walls of the channels exl being formed respectively 1n the outer corwith the screen-cloth when assexnb-ed for:
tending in directions .substantially arallcl forming a box-frame screen of the character of that shown and described in the aforesaid patent, in which the Walls of the framemembers are substantially parallel to the plane of the screen-cloth.
The inner frame-member comprises a. base 5 and walls 6 6, the latter extending outwardly from the respective sides of'thebase. The outer frame-member comprises a base 7 and walls 8 8, the latter extending` in- Wardly from the respective sides of the base. The walls of these frame-members preferably extend substantially radial of the screen when assembled.
` utwardly extending beads 9 9 are between the base 5 and respective Walls 6 of the inner frame-member, being formed up from the sheet metal of which the inner frame-member is composed.
Channels 10 are thus formed, in the ends of which, at the corners of the screen, limbs 11 11 of inner reinforce corner pieces l2 are received. These reinforce cornerieces are preferably formed of metal Whici lits the channels and which is bent for forming the limbs, which are substantially at Arightangles to each other. The limbs are received in the channels of the inner frame-members for reinforcing the screen at the corner thereof. The outer ends of the Walls 6 are preferably bent inwardly as shown at 13, being preferably bent back upon the walls and forming strengthening edges for the same.
The walls 8 of the outer frame-members may be provided with inwardly projecting beads 16 adjacent their bases. These beads serve the purpose of strengthening the outer members.
The inner frame-members are preferably mitered at the corners, as shown vat, 21, and the outer frame-members are preferably mitered at the corners, as shown at 22. An outer corner-piece 23, which preferably comprises a base 2l and Walls 25 having extensions 26, covers the joint at each ot the cor ners of the screen. The respective walls and extensions of the outer corner-piece are provided With inwardly extendin beads 27. The beads 27 are received within the outer grooves of the beads 16. Rivets 29 pass through the outer cornerieee and the walls of the outer and inner rame-members for securing the parts together, recesses 30 31 32 ner-piece, and in the walls of the outer and inner frame members for accommodating the rivet-heads, it being understood that the screen-cloth, shown at 33, will have been seaired in place before the frame is riveted together, und, if desired, one or more rivets, as chown at 34, may be passed through the Patented Feb. 1, 1910.
walls of the outer and' inner frame-members intermediate of the corners for securing the parts together.
In assembling the screen, the inner reinforce corner-pieces are received in the ends of the channels 10 at the respective ends of the Stiles and rails f forming the corners.
these inner frame-members respectively bei ing preferably a one-piece structure for the respective .stiles and rails, thereby forming i an inner frame for the sei-een. The walls of the inner frame-members preferably diverge rom each other slightly as indicated in Fifi'.
Ll.' The screen-cloth is received about the outer ends of these diergng walls and bent inwardly as shown at The inwardly bent end of the screen-cloth is received within the channel of the inner traine-member if desired. There muy be a screen-cloth on but one side of the inner f 'ame as shown at 33 and there may be an additional screencloth 36 at the other side of the inner traine, the inner edges 37 of which are bent over the other wall of the inner fraaie-member and received within the channels of saldi frame-members, the .said screen-cloth 3G being preferably a protecting cloth ot' wider mesh than the screen cloth 33. Then now the outer frame-members are forced over the inner frame-members, the walls of the. latter which have been in tiexed relation, are reiiexed into parallelism with the screen-cloth, therebv stretching the .screen-cloth between 'l the frame-members at the opposite ends of The screen -ciotli is rml;1 clasped between the walls of the respective inner and outer members. The inner edges l of the walls of the outer frame-members' clamp the screen-cloth between theniseli-'es i the screen.
and the beads of the inner frame-members.
"over which latter the screen-cloth is curled.
The mouths 38 39 of the respective inner and outer frame-members ai'e presented in directions substantially parallel with the' screen-cloth when the screen is assembled. lVhen the outer-frame-inenibers have been received about the inner frame-members and the screen-cloth thereon, the outer cornerpieces are secured in place as hereinbefore described.
41 il represent friet]oli-sprung.` one or These i more if which may be employed. spring.; are shown as leaf-springs and are respectively received through slits 2 t3 t-l in the base o" one of the outer frame-members. whereby an f nter strap l5 and an inner strap 4G are formed. between which the frictionspring is received. the heel -li' of said spring being received under the hase of said outer l The said friction-springr A frame -1 member. extends outwardly away from the screencloth iii a curve whose convexity is presented toward the side of the screen-frame.
In other words. the side of said screen-frame is tangent to said curve. Said spring is preferably provided with au inward exten- ;Y sion 4S. which projects through an aperture E 49 in the base of .said outer frame-member. there being a toe In.) at the inner end ol said extension inside said outer l'ra11W-member. whirh i` adapted to contact the inner 'lace of the base ot' .said outer traine-mendier. thereby limiting the outward projection of l `aid spring and holding said spring in' place under tension. the tension of said sprinpr Q locking the same in place in the .slits and avoiding necessity :if other fastening iueans. When said screen is in place in the window- 'traine` indicated in dottfd linesat 5l. which forms a guide-way for the screen. the outer end of said spring is forced toward the traine of the screen and thereb)v exerts additional friction against longitudinal movement of the spring at the walls of ksaid slits. Ii' Vit is desired to release said spring.;` this may he easily done by forcing the inner end of the inward extension -LS lengthwise of the springr for releasing the toe 50 from contart with the inner face o the outer framemenilier. thereby permitting it to pass through the aperture Vif). 'lien forced inwardl v. the exten-ion is received within the channels of the traine-members. The side of the screen-frame opposite the spring may he provided with a handle and a suitable raising handle 53 ma) also he provided.
Havingr thus fully described niv invention. what l clain'i as new and desire to secure b v Letters Patent is:
1- In a metal-frame screen of the character deseribed. the combination of an inner frame-member. an outer frame-member, and a screen-cloth. said trame-members comprising opposed stile and rail lengths. the said g lengths of said members being of substantial U-.shapcd channel forni in cross-.section vcomprising a base and side walls having months. presented toward ich other and suhstantialli parallel to the plane ofsaid screencloth. the said stile and rail lengths of said i inner frauie-ineniln-r eat-li having an outwardly projectingr bead exteudin r longituddinalljr thereof adjacent its base. said screencloth being' curled over said heads and clamped between the adjacent side walls at one of the sides' of `4aid frame-nienihers. said srreen-elotli being stretched between the i heads of opposed lengths of said inner frmne-iueinlier so that the plane of .said screen-cloth between said beads will be eo- V incident with the outer faces of the said heads for locating .said .screen-cloth between said heads of said opposed lengths of said inner fi'aini \-niendwr to one side ot' the frame of said sei-een, substantially as described.
2. ln a metal-frame screen of the character described. the mmhination of an outer fraiue-nieuiher. an inner frame-member, and a screen-cloth. said frame-members comprising opposed stile and rail lengths, the said ino stantial elninin-l-tnrnt in rro=s-seetioa compris-ing' a base and side walls and having mouths presented toward each other, the said stile and rail lengths ot said inner tramcmember having' outwardly projecting beads and the said stile and rail lengths of said outer iranie-member having inwardly protndinally ol' and adjacent to the bases. of the lengths on which the saine are located. the' sant beads being respeet i \'el located betweenthe bases of the lengths of that frame-inemfralne-members, and said screen-cloth being located between the free edges of said sidewalls and beads at one of theV sides of said frame-members and stretched bet\\'een.the bends of o )posed stile and rail lengths of said inner rameanexnber, the said stretched portion of.said screen-cloth -extending outwardly beyond said beads and side-walls, substantially as described.
1n a metal-frame screen of the characterdeseribtal, the eombination of outerv and inner frame. members, and :t screen -cloth, said .inner and ontet.traine-members compris-ing opposed stile and rail lengths, the said lengths of said frame-members being each of substantial channel-forni in crossseetion comprising a base and opposed sidewalls, said opposed side-walls bein;r at the respective sides ot' said bases. the said stile and rail lengths of said inner {rante-member baving ontwardl;v projecting beads adiacent their bases and the. said stile and rail lengths of said outer trame-member having' inwardl) projectinw beads adjacent their bases, the .said beats on one of said frame-members beingin the lateral planes of the side-walls ot' the other of said frame-members. said sereen-clotb being received between said opposed side-walls and beads at one of the .sides of said frame-members and stretched between the beads of opposed stile and rail lengths of .said inner frame-member for leating the plane of said stretched portion of said sereen-eloth when extended to one side of said inner -frame-member outside saidl inner f ranie-member. substantially as described.
4. metal-frame screen of the character described comprising in combination stiles and rails, having joints at the corners of said screen, said stiles and rails embracing opposed inner and outer frame-members, a sereen-cloth, said frame-members being of substantial channel form comprising a base and opposed side-walls, said opposed sidewalls being at the respective sides of the bases. said opposed side-walls at: one of said sides being spaced from said opposed side walls at; the `other of said sides, said inner frame-member being provided with an outwardly projet-ting bead extending longitudinali) thereof and bent from the metal of which said inner tranne-metaler is composed t'or forming` an inner channel` inner corner pieces respeetivelv having' limbs at substant tial right-angles to each other received bv said channels, in said :stiles and rails at the l resina-tive corners of said screen, and outer iecting heads.the .said beads extending lungi` zorlie1-pieees .received over aid 'joints at sai-l eorners.
ln a metal-traimscreen of the character dewtilied. the eunibinatimi of Stiles atnl railsronxprising inner and unter frann--nienr ber on which the same are located and the side walls of the lengths of the other of said 'bers of channel torni comprisingr a base and side-walls spared apart projecting trom said base. a screen-cloth received between the side-walls ot' said franie-nietnbers, said sidewalls extending in planes .substantially parallel with the plane of said screen-cloth, each of said inner traine-meinters having n bend at each side ot' its base formed therefrom for forming an inner channel, and inner reinforce corner-pieces respectively having limbs at substantially right angles to. each other received in said channels of said respective stiles and rails at the corners of the sei-een. substantially as described.
t. In a metal-frame screen, the combination of a sheet-metal frame-member provided with slits for forming straps. and a leaf friction-spring, one end of which is received b v said slits for beingl recefved alternately under and above said straps of said sheet-metal frame-member at ditferent points. the other end of said leaf frictionspring extending ontwardljvy on a curve whose convexity is presented toward said frame-member and acting when tiexed out of normal position to bind said first-named end of said spring against said straps.
T. In a metal-frame screen, the combination of a :sheet -metal frame-member provided with slits for forming straps. a leaf friction-spring, one end of which is received by said slits for being received under and above said straps of said sheet-metal framexnember at diii'erent points, the other end of said leaf friction-spring extending out-f wardly 011 a curve whose convexity is presented toward said trame-member and acting when flexed ont of normal position to bind said first-named end of said spring against said straps, said leaffl'ictionspring having an inward extension and said metal frame-member having an aperture through which said extension is received, and limit- -leaf friction-spring adapted to contact the slideway for said screen, saidA frame member being provided with slits through which one 4. Lese end of said friction-spring is received, the other end of said friction-spring being bent outwardly from said slits and being provided with an extension, the said frumemexnber being provided with an aperture for receiving said extension when said spring flexed ont of normal position by Contact with said slidewe v. i
9. In :l inetni-rn1ne screen` the combination, with n screen-eloth.I of a hollow metalfrznne embracing inner and outer frameineinbeis having bases und opposed side walls at the respective sidesof said bases, said side-walls being substantially parallel to the plane of said -screen-cloth, a frictionspring secured nl one end to said frame and adapted to contact the guidewu of said screen, the other end of said frictlon-spring posed side-walls at the respective sides ofsaid bases, said extension having a. hook in its inner end received through said npertureV and said hook contacting the inside of said frame for limiting the outward movement of said spring, substantially as described.
1n testimonj,v whereof-I have subscribed my naine hereto in the presence of two subscribing witnesses. Y
STEPHEN iV. MCGRATH. Witnesses: LILLIAN BUnNm'r, O. S. BRYANT.
US45596808A 1908-10-03 1908-10-03 Metal-frame screen. Expired - Lifetime US947838A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577379A (en) * 1949-03-15 1951-12-04 Osborne W Garvin Screen frame

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577379A (en) * 1949-03-15 1951-12-04 Osborne W Garvin Screen frame

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