US20010009184A1 - Blow molding machine - Google Patents
Blow molding machine Download PDFInfo
- Publication number
- US20010009184A1 US20010009184A1 US09/791,001 US79100101A US2001009184A1 US 20010009184 A1 US20010009184 A1 US 20010009184A1 US 79100101 A US79100101 A US 79100101A US 2001009184 A1 US2001009184 A1 US 2001009184A1
- Authority
- US
- United States
- Prior art keywords
- blow head
- blow
- chamber
- molding sand
- molding machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/23—Compacting by gas pressure or vacuum
- B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
Definitions
- This invention relates to an improvement of a blow molding machine.
- a prior-art blow molding machine is disclosed in Japanese Patent Kokai (JP, A) 6-277,800, which was laid open to the public on Oct. 4, 1994.
- That blow molding machine has a blow head, a plurality of juxtaposed air passages with blow-off ports being connected to the blow head, for adjusting the pressure and the flow rate of air to be supplied to the blow head, and an air supply source connected to the take-in port of each passage.
- compressed air is introduced into the blow head to blow molding sand from the blow head into a pair of mated frames, and this charged molding sand is then compressed in the frames.
- This invention has been conceived in view of the above drawback. It aims to provide an improved blow molding machine that can cause molding sand to flow in a blow head at a sufficient speed even if a large amount of molding sand is charged from the blow head into the frames that define a mold space.
- the blow head of the blow molding machine of this invention includes at least one chamber.
- This chamber is disposed on the inner surface of the external wall of the blow head at the middle portion of the blow head.
- the chamber has a perforated inner surface which faces the molding sand held in the blow head.
- a pressurized air supply source is connected to the chamber.
- pressurized air is supplied from the source or another air supply source to the molding sand, which is held in the blow head, to blow it into the mold space
- pressurized air is also supplied from the source (that is connected to the chamber) into the chamber.
- the air from the source passes through the apertures formed in the inner surface of the chamber and then passes through the molding sand at the middle portion of the blow head.
- the molding sand is fluidized and has sufficient speed. It is then well charged into the mold space.
- the molding machine of the above aspect may include a plurality of juxtaposed passages connected to the upper part of the blow head. Each of these passages is selectively opened and closed to adjust the pressure and flow rate of the air to be supplied to the blow head to blow the molding sand into the mold space.
- FIG. 1 is a sectional view of an embodiment of a blow molding machine of the present invention.
- FIG. 2 is a sectional view in an enlarged scale of the blow head of the molding machine of FIG. 1.
- FIG. 3 is a cross-sectional view along line III—III in FIG. 2.
- FIG. 4 is a cross-sectional view along line IV—IV in FIG. 2.
- FIG. 5 is a cross-sectional view similar to FIG. 4, to show an alternative blow head.
- FIG. 1 show a cross-sectional view of an embodiment of the blow molding machine of the present invention.
- the molding machine includes a pair of frames 2 , 4 that can contact each other.
- a vertical match plate 6 is supported between the frames 4 , 4 in any known manner.
- the match plate 6 holds a large pattern part 6 a and a small pattern part 6 b on one of its surfaces and also large and small pattern parts 6 a , 6 b on the other surface.
- the frames 2 , 4 have blow-in ports 8 , 10 respectively.
- Pressing plates 12 , 14 are inserted into the frames 2 , 4 respectively.
- the pressing plates 12 , 14 are respectively pushed inward by cylinders 16 , 18 .
- the frame 2 , match plate 6 , and pressing plate 12 define a mold space 2 a
- the frame 4 , match plate 6 , and pressing plate 14 define a mold space 4 a.
- the blow molding machine includes a blow head 20 .
- the blow head 20 is comprised of an upper portion 22 , a middle portion 24 , and a lower portion 26 .
- the upper portion 22 is a cylindrical tube, as shown in FIG. 3, and has a flange 22 a at the bottom, as shown in FIG. 2.
- the middle portion 24 is a square tube, as shown in FIG. 4, and has a flange 24 a at the top and a flange 24 b at the bottom, as shown in FIG. 2.
- the lower portion 26 is a square tube at its upper portion and has a flange 26 a at the top.
- the top portion 22 and the middle portion 24 are secured to each other through the flanges 22 a , 24 a , while the middle portion 24 and the lower portion 26 are secured to each other through the flanges 24 b , 26 a.
- the upper portion 22 has a sand-feeding mouth 28 and a gate 30 at the top.
- a pipe 32 at one end is connected to the upper portion 22 at a location near the top thereof.
- This pipe 32 at the other end is connected to a passage assembly 34 which has a plurality of passages 34 a .
- Each passage 34 a has a valve 36 , and all the valves 36 are connected to a pressurized air supply source 40 through pipes 38 .
- the valves 36 are selectively opened or closed in any known manner to adjust the pressure and speed of an air flow that is supplied from the air source 40 through the pipe 32 .
- the passage assembly 34 acts as means to adjust the pressure and speed of the air flow or air flows which are introduced into the blow head 20 to blow molding sand S from the blow head 20 into the mold spaces 2 a , 4 a.
- a cylindrical tube 42 which is integrally made from four plates 42 a , 42 b , 42 c , and 42 d , is secured to the inner surfaces of the upper and middle portions 22 , 24 .
- the cylindrical tube 42 is shaped as a conical frustum at the upper portion 22 and as a square tube at the middle portion 24 .
- the plate 42 a , an upper small plate 44 a , a lower small plate 44 b , two side small plates 44 c , 44 d , and the external wall of the middle portion 24 define a chamber 48 on the inner surface of the external wall.
- a plurality of small apertures 52 are formed in at least part of an inner wall 44 e of the chamber 48 . These small apertures are small enough so that they do not allow the molding sand S to come into the chamber 48 .
- the plate 42 c , an upper small plate 46 a , a lower small plate 46 b , two side small plates 46 c , 46 d , and the external wall of the middle portion 24 define another chamber 50 on the inner surface of the external wall.
- a plurality of small apertures 52 are also formed in an inner wall 46 e of the chamber 50 .
- the chamber 48 is connected to the pressurized air supply source 40 (FIG. 1) through a connecting pipe 54 and a valve 56 .
- the chamber 48 may be connected to another pressurized air supply source (not shown).
- a distribution pipe 58 connects the connecting pipe 54 to the chamber 50 .
- air is introduced from the air supply source into the chambers 48 , 50 , as shown by arrows.
- FIG. 5 is a horizontal, cross-sectional view similar to FIG. 4 and shows an alternative embodiment of the chambers 48 , 50 .
- two more chambers 60 , 62 are provided in addition to the chambers 48 , 50 .
- the chamber 60 , 62 are defined in a manner similar to that for defining the chambers 48 , 50 .
- the four chambers 48 , 50 , 60 , 62 are separated from each other in the embodiment shown in FIG. 5.
- these chambers may be replaced with a single, continuous, annular chamber.
- An annular distribution pipe 64 is connected to the pipe 54 and the chambers 48 , 50 , 60 , 62 such that the air from the air supply source is distributed to all the chambers.
- the lower portion 26 of the blow head 20 has forked pyramids 26 a , 26 b at its lower part (FIG. 1).
- the pyramids 26 a , 26 b have a tip or nozzle 27 a and a tip or nozzle 27 b , respectively.
- the blow head 20 is supported for vertical movement in any known manner such that the nozzles 27 a , 27 b are sealingly inserted into the blow-in ports 8 , 10 of the frames 2 , 4 (mold spaces 2 a , 4 a ).
- the blow head 20 is lowered so that the nozzles 27 a , 27 b are inserted into the blow-in ports 8 , 10 of the mated frames 2 , 4 .
- the gate 30 is then opened, and a predetermined amount of molding sand is introduced into the blow head 20 through the mouth 28 .
- This state is shown in FIG. 1.
- the valve 56 is then opened, so that pressurized air flows into the chambers 48 , 50 , as shown in FIG. 4 (or the chambers 48 , 50 , 60 , 62 as shown in FIG. 5, or the single continuous chamber described above) and into the molding sand S, thereby fluidizing it.
- An appropriate number of the passages 34 a of the passage assembly 34 are selected.
- Their associated valves 36 are opened for an appropriate period, so that an air flow suitable to the amount of the molding sand S is introduced into the blow head 20 .
- the air When the air is introduced into the blow head 20 , preferably, two or more air flows are used.
- the pressure, flow rate, and period of the air flows are adjusted or varied in accordance with the size of the space, i.e., the distances between the pressing plate 12 (or 14 ) and the pattern portions 6 a , 6 b .
- an air flow is used so that the long space between the pressing plate 12 (or 14 ) and the small pattern portion 6 b is filled with the molding sand in a high density
- a next air flow is used so that the short space between the pressing plate 12 (or 14 ) and the large pattern portion 6 a is filled with the molding sand in a low density.
- a third air flow is used so that the top part of the mold space 2 a (or 4 a ), i.e., the upper and long space between the match plate 6 and the pressing plate 12 (or 14 ), is filled with the molding sand in a high density.
- the molding sand S Since the molding sand S is fluidized at the middle portion 24 of the blow head 20 , it is well charged into the mold spaces 2 a , 4 a .
- the air flows introduced into the blow head 20 through the pipes 32 and 54 are discharged from vent holes (not shown) provided in the frames 2 , 4 .
- the molding sand blown and charged into the frames 2 , 4 is then compressed by the pressing plates 12 , 14 of the cylinders 16 , 18 . After this compression, the pressing plates 12 , 14 are withdrawn from the frames 2 , 4 , and the blow head 20 is lifted up to withdraw the nozzles 27 a , 27 b from the blow-in ports 8 , 10 of the frames.
- the hardened molding sand is taken out in any known manner. Thus two sand molds (drag and cope) that have no frame are produced.
- the outer surfaces of the pattern portions 6 a , 6 b are substantially flat, to obtain the same compression effect as above the pressure and the flow rate of the air flow that is used for the lower parts of the mold spaces 2 a , 4 a can be less than those of the air flow that is used for the upper parts of the mold spaces.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
Abstract
A blow molding machine provided with a blow head to hold molding sand therein, at least one passage connected to an upper portion of the blow head at one end thereof and connected to a pressurized air supply source at the other end so as to apply compressed air to the molding sand held in the blow head, for blowing and charging the molding sand from the blow head into a mold space that is located adjacent the blow head and then compacting the charged molding sand to produce a sand mold. The blow molding machine includes at least one chamber disposed on an inner surface of an external wall of the blow head at a middle portion of the blow head, the chamber having an inner surface facing the molding sand held in the blow head, at least part of the inner surface having a plurality of apertures to allow air to pass through them, and a pressurized air supply source connected to the chamber to supply compressed air into the chamber and into the molding sand to fluidize it.
Description
- This invention relates to an improvement of a blow molding machine.
- A prior-art blow molding machine is disclosed in Japanese Patent Kokai (JP, A) 6-277,800, which was laid open to the public on Oct. 4, 1994. That blow molding machine has a blow head, a plurality of juxtaposed air passages with blow-off ports being connected to the blow head, for adjusting the pressure and the flow rate of air to be supplied to the blow head, and an air supply source connected to the take-in port of each passage. In this molding machine, compressed air is introduced into the blow head to blow molding sand from the blow head into a pair of mated frames, and this charged molding sand is then compressed in the frames.
- In such a molding machine, when a blow head has a large capacity for molding sand to be charged into frames that also have a large capacity, compressed air introduced into the upper part of the blow head to blow the molding sand from the blow head into the frames cannot move the molding sand with a sufficient speed. This results in poorly compacting the molding sand.
- This invention has been conceived in view of the above drawback. It aims to provide an improved blow molding machine that can cause molding sand to flow in a blow head at a sufficient speed even if a large amount of molding sand is charged from the blow head into the frames that define a mold space.
- To this end, in one aspect of the present invention, the blow head of the blow molding machine of this invention includes at least one chamber. This chamber is disposed on the inner surface of the external wall of the blow head at the middle portion of the blow head. The chamber has a perforated inner surface which faces the molding sand held in the blow head. A pressurized air supply source is connected to the chamber. When pressurized air is supplied from the source or another air supply source to the molding sand, which is held in the blow head, to blow it into the mold space, pressurized air is also supplied from the source (that is connected to the chamber) into the chamber. The air from the source passes through the apertures formed in the inner surface of the chamber and then passes through the molding sand at the middle portion of the blow head. Thus the molding sand is fluidized and has sufficient speed. It is then well charged into the mold space.
- The molding machine of the above aspect may include a plurality of juxtaposed passages connected to the upper part of the blow head. Each of these passages is selectively opened and closed to adjust the pressure and flow rate of the air to be supplied to the blow head to blow the molding sand into the mold space.
- FIG. 1 is a sectional view of an embodiment of a blow molding machine of the present invention.
- FIG. 2 is a sectional view in an enlarged scale of the blow head of the molding machine of FIG. 1.
- FIG. 3 is a cross-sectional view along line III—III in FIG. 2.
- FIG. 4 is a cross-sectional view along line IV—IV in FIG. 2.
- FIG. 5 is a cross-sectional view similar to FIG. 4, to show an alternative blow head.
- FIG. 1 show a cross-sectional view of an embodiment of the blow molding machine of the present invention. The molding machine includes a pair of
frames 2, 4 that can contact each other. A vertical match plate 6 is supported between the frames 4, 4 in any known manner. The match plate 6 holds alarge pattern part 6 a and asmall pattern part 6 b on one of its surfaces and also large andsmall pattern parts frames 2, 4 have blow-inports Pressing plates frames 2, 4 respectively. Thepressing plates cylinders 16, 18. Theframe 2, match plate 6, andpressing plate 12 define a mold space 2 a, while the frame 4, match plate 6, andpressing plate 14 define a mold space 4 a. - In reference to FIGS.1-4, it is seen that the blow molding machine includes a
blow head 20. Theblow head 20 is comprised of anupper portion 22, amiddle portion 24, and alower portion 26. Theupper portion 22 is a cylindrical tube, as shown in FIG. 3, and has a flange 22 a at the bottom, as shown in FIG. 2. Themiddle portion 24 is a square tube, as shown in FIG. 4, and has a flange 24 a at the top and aflange 24 b at the bottom, as shown in FIG. 2. Thelower portion 26 is a square tube at its upper portion and has aflange 26 a at the top. Thetop portion 22 and themiddle portion 24 are secured to each other through the flanges 22 a, 24 a, while themiddle portion 24 and thelower portion 26 are secured to each other through theflanges - As shown in FIGS. 1 and 2, the
upper portion 22 has a sand-feedingmouth 28 and agate 30 at the top. As shown in FIG. 1, apipe 32 at one end is connected to theupper portion 22 at a location near the top thereof. Thispipe 32 at the other end is connected to apassage assembly 34 which has a plurality ofpassages 34 a. Eachpassage 34 a has avalve 36, and all thevalves 36 are connected to a pressurizedair supply source 40 throughpipes 38. Thevalves 36 are selectively opened or closed in any known manner to adjust the pressure and speed of an air flow that is supplied from theair source 40 through thepipe 32. Thepassage assembly 34 acts as means to adjust the pressure and speed of the air flow or air flows which are introduced into theblow head 20 to blow molding sand S from theblow head 20 into the mold spaces 2 a, 4 a. - As is clear from FIGS. 2 and 3, a
cylindrical tube 42, which is integrally made from fourplates middle portions cylindrical tube 42 is shaped as a conical frustum at theupper portion 22 and as a square tube at themiddle portion 24. As is clear from FIGS. 2 and 4, theplate 42 a, an upper small plate 44 a, a lowersmall plate 44 b, two sidesmall plates middle portion 24 define achamber 48 on the inner surface of the external wall. A plurality ofsmall apertures 52 are formed in at least part of aninner wall 44 e of thechamber 48. These small apertures are small enough so that they do not allow the molding sand S to come into thechamber 48. Similarly, theplate 42 c, an upper small plate 46 a, a lowersmall plate 46 b, two sidesmall plates middle portion 24 define anotherchamber 50 on the inner surface of the external wall. A plurality ofsmall apertures 52 are also formed in aninner wall 46 e of thechamber 50. Thechamber 48 is connected to the pressurized air supply source 40 (FIG. 1) through a connectingpipe 54 and avalve 56. Alternatively, thechamber 48 may be connected to another pressurized air supply source (not shown). Adistribution pipe 58 connects the connectingpipe 54 to thechamber 50. Thus, when thevalve 56 is opened, air is introduced from the air supply source into thechambers - FIG. 5 is a horizontal, cross-sectional view similar to FIG. 4 and shows an alternative embodiment of the
chambers more chambers chambers chamber chambers chambers annular distribution pipe 64 is connected to thepipe 54 and thechambers - The
lower portion 26 of theblow head 20 has forkedpyramids pyramids nozzle 27 a and a tip ornozzle 27 b, respectively. Theblow head 20 is supported for vertical movement in any known manner such that thenozzles ports frames 2, 4 (mold spaces 2 a, 4 a). - In operation, the
blow head 20 is lowered so that thenozzles ports frames 2, 4. Thegate 30 is then opened, and a predetermined amount of molding sand is introduced into theblow head 20 through themouth 28. This state is shown in FIG. 1. Thevalve 56 is then opened, so that pressurized air flows into thechambers chambers passages 34 a of thepassage assembly 34 are selected. Their associatedvalves 36 are opened for an appropriate period, so that an air flow suitable to the amount of the molding sand S is introduced into theblow head 20. - When the air is introduced into the
blow head 20, preferably, two or more air flows are used. The pressure, flow rate, and period of the air flows are adjusted or varied in accordance with the size of the space, i.e., the distances between the pressing plate 12 (or 14) and thepattern portions small pattern portion 6 b is filled with the molding sand in a high density, and a next air flow is used so that the short space between the pressing plate 12 (or 14) and thelarge pattern portion 6 a is filled with the molding sand in a low density. A third air flow is used so that the top part of the mold space 2 a (or 4 a), i.e., the upper and long space between the match plate 6 and the pressing plate 12 (or 14), is filled with the molding sand in a high density. - Since the molding sand S is fluidized at the
middle portion 24 of theblow head 20, it is well charged into the mold spaces 2 a, 4 a. The air flows introduced into theblow head 20 through thepipes frames 2, 4. The molding sand blown and charged into theframes 2, 4 is then compressed by thepressing plates cylinders 16, 18. After this compression, thepressing plates frames 2, 4, and theblow head 20 is lifted up to withdraw thenozzles ports - If the outer surfaces of the
pattern portions - The foregoing embodiments are exemplary only. It is not intended that the invention be limited to them. It will be understood by one skilled in the art that any other variation and modification can be made without departing from the spirit and the scope of the invention. Thus those variations and modifications are understood to be included in the attached claims.
Claims (4)
1. A blow molding machine provided with a blow head to hold molding sand therein, at least one passage connected to an upper portion of the blow head at one end thereof and connected to a pressurized air supply source at the other end so as to send compressed air to the molding sand held in the blow head, for blowing and charging the molding sand from the blow head into a mold space that is located adjacent the blow head and then compacting the charged molding sand to produce a sand mold, comprising:
at least one chamber disposed on an inner surface of an external wall of the blow head at a middle portion of the blow head, the chamber having an inner surface facing the molding sand held in the blow head, at least part of the inner surface having a plurality of apertures to allow air to pass through the apertures, and
a pressurized air supply source connected to the at least one chamber to supply compressed air into the chamber and into the molding sand, thereby fluidizing the molding sand.
2. The blow molding machine of , wherein the pressurized air supply source connected to the upper portion of the blow head is the pressurized air supply source that is connected to the at least one chamber.
claim 1
3. The blow molding machine of or , comprising a plurality of juxtaposed passages connected to the upper portion of the blow head, the passages being selectively opened and closed.
claim 1
2
4. The blow molding machine of , , or 3, wherein the at least one chamber is at least one chamber that extends around the periphery of the inner surface of the external wall of the blow head.
claim 1
2
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/791,001 US20010009184A1 (en) | 1998-03-27 | 2001-02-22 | Blow molding machine |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JPP10-100391 | 1998-03-27 | ||
JP10039198A JP3332214B2 (en) | 1998-03-27 | 1998-03-27 | Blow molding machine |
US27462799A | 1999-03-23 | 1999-03-23 | |
US09/791,001 US20010009184A1 (en) | 1998-03-27 | 2001-02-22 | Blow molding machine |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US27462799A Division | 1998-03-27 | 1999-03-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20010009184A1 true US20010009184A1 (en) | 2001-07-26 |
Family
ID=14272703
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/791,001 Abandoned US20010009184A1 (en) | 1998-03-27 | 2001-02-22 | Blow molding machine |
Country Status (3)
Country | Link |
---|---|
US (1) | US20010009184A1 (en) |
JP (1) | JP3332214B2 (en) |
DE (1) | DE19913119B4 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1857201A1 (en) * | 2007-01-16 | 2007-11-21 | Sintokogio, Ltd. | Sand-introducing-type sand molding machine |
EP2457677A1 (en) * | 2010-11-26 | 2012-05-30 | Sintokogio, Ltd. | A method for green sand molding |
CN104399904A (en) * | 2014-12-18 | 2015-03-11 | 苏州明志科技有限公司 | Controllable sand shooting mechanism and controllable sand shooting method of core shooter |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE557503C (en) * | 1931-02-08 | 1932-08-24 | Masch U Werkzeugfabrik Kabel | Method and molding machine for filling molding and core boxes with molding sand using compressed air |
US4460032A (en) * | 1982-01-25 | 1984-07-17 | Pettibone Corporation | Method and apparatus for blowing cores etc. using a plunger-cleaned blow box suitable for quick-set sand |
JP3092764B2 (en) * | 1993-03-26 | 2000-09-25 | 新東工業株式会社 | Blow molding method |
-
1998
- 1998-03-27 JP JP10039198A patent/JP3332214B2/en not_active Expired - Fee Related
-
1999
- 1999-03-23 DE DE19913119.8A patent/DE19913119B4/en not_active Expired - Lifetime
-
2001
- 2001-02-22 US US09/791,001 patent/US20010009184A1/en not_active Abandoned
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1857201A1 (en) * | 2007-01-16 | 2007-11-21 | Sintokogio, Ltd. | Sand-introducing-type sand molding machine |
US20080169079A1 (en) * | 2007-01-16 | 2008-07-17 | Minoru Hirata | Sand-introducing-type sand molding machine |
WO2008087758A1 (en) * | 2007-01-16 | 2008-07-24 | Sintokogio, Ltd. | Sand-introducing-type sand molding machine |
EP2457677A1 (en) * | 2010-11-26 | 2012-05-30 | Sintokogio, Ltd. | A method for green sand molding |
CN104399904A (en) * | 2014-12-18 | 2015-03-11 | 苏州明志科技有限公司 | Controllable sand shooting mechanism and controllable sand shooting method of core shooter |
Also Published As
Publication number | Publication date |
---|---|
DE19913119B4 (en) | 2016-07-28 |
DE19913119A1 (en) | 1999-09-30 |
JP3332214B2 (en) | 2002-10-07 |
JPH11277183A (en) | 1999-10-12 |
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Legal Events
Date | Code | Title | Description |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |