CN1482169A - Hand-held grinder assistant brick adaptive diverse surfaces - Google Patents
Hand-held grinder assistant brick adaptive diverse surfaces Download PDFInfo
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- CN1482169A CN1482169A CNA021563969A CN02156396A CN1482169A CN 1482169 A CN1482169 A CN 1482169A CN A021563969 A CNA021563969 A CN A021563969A CN 02156396 A CN02156396 A CN 02156396A CN 1482169 A CN1482169 A CN 1482169A
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Abstract
The present invention discloses grinding brick suitable for both curved and planar surface. One embodiment scheme is one kind of hand held elastic grinding brick suitable for both curved and planar surface with Shore A hardness of 45-90. The elastic grinding brick is made of composition of several polymers, including ethylene-vinyl acetate copolymer, metallocene catalytic ethylene-alpha-olefin copolymer and foaming agent. The making process of the grinding brick is also disclosed. The grinding brick features its optimized sizes for emery paper in standard size to coat perfectly, and this makes the use of emery paper convenient.
Description
Technical field
The present invention relates to grinding aid brick (sanding blocks), more particularly handheld grinding aid brick, it can be adapted to crooked or smooth surface at an easy rate.
Background of invention
On current market, have various in style to be used for smooth and polishing is coarse or the handheld sand papering equipment of irregular surface.In this, a kind of handheld sand papering equipment of special general type is a kind of woodbox, at its outer wrap a slice sand paper.The handheld sand papering equipment of another common common type is the brick of the definite shape of making of rubber or other resilient materials, along the basal surface of brick with the fixing a slice sand paper of stationary jaw or sharp-pointed projection (projection).Though these two kinds common handheld sand papering equipment use well for smooth surface energy, they are not particularly suitable for curved surface and use.In addition, such sand papering equipment generally need and be adjusted to suitable size standard-sized sand paper cutting.
In brief, above-mentioned common grinding aid brick has big relatively, smooth sand paper stayed surface, and this surface can not be fit to the surface of curved shape satisfactorily.Therefore, the common grinding aid brick of this class regular meeting when being used for curved surface causes uneven sand papering; This mainly is because these bricks can not be according to by the curvature on the surface of sand papering and bending, and is being applied in over-drastic pressure by lip-deep some position regular meeting of sand papering.In addition, the pressure that overuses may cause excessive sand papering and sand paper is damaged rapidly, and then may damage following surface.Simultaneously, the general standard-sized sand paper (8.5 " * 11 ") that uses of common grinding aid brick, this class sand paper must be cut and/or be adjusted to suitable grinding aid brick stayed surface in this case; Regular meeting produces spendable waste material during such cutting.
Crooked and smooth surface needs the common situation of sand papering to comprise the vehicle body repairing of automobile before painting again.Although long time has been used in the sand papering of automobile, wherein relevant with sand papering problem is still a lot.For example; some position of some bodies of a motor car relatively is level and smooth; therefore but the bending of inclination is arranged, be difficult to carry out equably sand papering (for example, traditional sand papering equipment through regular meeting along caused " ripple mark (rippling) " effect by the surface of sand papering).Other partly are smooth for vehicle bodies, but need not abrade the zone (for example under zone between the surface that will spray paint and the taillight and similar situation) around it with sand papering the time.Because these problems, for automobile, the time hand commonly used finish sand paper correct grinding (, with individual laborer's hand and point and support sand paper).For example, in auto repair shop, workman's common way is to use the supporting structure of two " paint rods " that are held together when sand paper disc now.Such paint rod is very heavy in use, and the edge is formed the ripple mark effect by the surface of sand papering easily, and standard-sized sand paper is all used on whole in use sand papering surface.
Therefore, need a kind of handheld grinding aid brick technically, it can be easy to be fit to bending or flat surfaces, and can utilize standard-sized sand paper preferably.The present invention has satisfied these needs and relevant advantage further is provided.
Invention is summed up
In brief, the present invention relates to be fit at an easy rate the handheld grinding aid brick of bending or flat surfaces.In one embodiment, handheld grinding aid brick is the elastomeric grinding aid brick that can be suitable for bending or flat surfaces, the Shore A durometer level that wherein elastomeric grinding aid brick has is from about 45 to about 90, and wherein elastomerics is that the composition of the polymkeric substance that is made into by multicomponent mixture is made.Especially multicomponent mixture comprise the ethene-alpha-olefin copolymer of ethylene-vinyl acetate copolymer and metallocene catalysis mixture (wherein the weight range of mixture be composition weight about 50% to about 100%), and whipping agent (for example, Cellmic C 121 (azodocarbonamide) compound).In another embodiment, multicomponent mixture further comprises one or more fillers (for example, lime carbonate), a kind of processing additives (for example, stearic acid, zinc oxide, titanium oxide, and organo-peroxide), and extending oil.
Grinding aid brick of the present invention can have the cubes rectangular dimension, and the outer perimeter of preferred cubes rectangular dimension is approximately 334 millimeters (for example, rectangular dimension is about 279 millimeters long in a preferred embodiment, about 35 mm wides, about 20 mm thick).In addition, grinding aid brick of the present invention generally has every cubic feet about 10 to about 30 pounds density (PCF), and preferred density is about every cubic feet 20 pounds (PCF).Further, grinding aid brick of the present invention has Shore A durometer level from about 50 to about 85, and preferred range is from about 60 to about 75, and preferred scope is from about 65 to about 70.
The invention still further relates to the manufacture method of the elastomerics grinding aid brick that is suitable for bending or flat surfaces.Generally speaking, it is as follows that this method comprises step: mix from the polymer composition of the multicomponent mixture preparation of the mixture of the ethene-alpha-olefin copolymer that comprises at least a ethylene-vinyl acetate copolymer and metallocene catalysis, wherein the scope of the amount of mixture is about 50% to about 100% of a composition weight; The composition of polymkeric substance is mixed and made into raw material with whipping agent and organo-peroxide linking agent under heating state, rolled material is produced lamellar material; Material sheet is thermoformed into the foam material thin slice in the tool mould; Cutting foam material thin slice is to make elastomerics grinding aid brick.
Description of drawings
Fig. 1 is the isometric view according to exemplary grinding aid brick of the present invention.
Fig. 2 A-B illustrates the situation according to the outside surface parcel standard sand paper of grinding aid brick of the present invention.
Fig. 3 is a process flow sheet of describing the processing step of the exemplary grinding aid brick of making according to the present invention.
The detailed description of invention
As mentioned above, the present invention relates to the grinding aid brick, more specifically, relate to and easily be fit to bending or smooth table The handheld grinding aid brick of face. Some more significant feature of grinding aid brick of the present invention disclosed herein comprises: (1) Its size can be utilized the whole surf zone of standard-sized sand paper capitally, and this is because with its outer circumference Optimization, this length make the more effective outside that is wrapped in it of such standard size sand paper; (2) solve usefulness Sand paper is wrapped in the upper so clumsy relevant shortcoming of method of paint rod. Although certain embodiments of the present invention Many details in following the detailed description and the accompanying drawings, propose, but those of ordinary skill in the art will recognize Knowing may have other embodiments to the present invention, or does not need herein more described details just can To revolve in fact the present invention.
In one embodiment, the present invention relates to a kind of elastomer grinding aid that is suitable for bending or flat surfaces Brick, wherein elastomer grinding aid brick has Shore A hardness (ASTM D2240) scope from about 45 to approximately 90. In this embodiment, elastomer grinding aid brick is the combination that utilizes the polymer that is made into by multicomponent mixture Thing is made, and these multicomponent mixtures comprise: the ethene-alpha-olefin of ethylene-vinyl acetate and metallocene catalysis The mixture that copolymer forms, wherein the scope of the amount of mixture is from accounting for about 50% of composition weight To about 100%; And blowing agent. In another embodiment, be used for making elastomer grinding aid brick Multicomponent mixture further comprises one or more fillers, processing additives, and extending oil.
For clearer and more definite, provide brief polymer nomenclature summary, to help understanding of the present invention. Generally , polymer is a kind of synthetic big molecule (that is, long-chain of the polymerisation derived from monomeric unit Strand) or be present in occurring in nature as big molecule (but they are still anti-derived from the polymerization of monomeric unit Should). The connection of strand is monomeric unit. For example, polyethylene is derived from monomer ethylene (CH2＝CH
2) (propylene) polymer. More specifically, polyethylene is that " homopolymers "-namely is by the list of single repetition Unit, i.e. monomer ethylene (CH2＝CH
2) and the polymer of composition.
On the contrary, " multipolymer " is the polymkeric substance that comprises two kinds (or more) different monomeric units.Multipolymer can come to synthesize usually in several ways.For example, multipolymer can be prepared by two kinds of (or multiple) different monomer copolymerizables.Two kinds (or multiple) different monomer randomly is distributed in the whole polymer chain in the prepared multipolymer of this method.These multipolymers are called as " random copolymers ".In addition, multipolymer can prepare by the covalent coupling or the connection of two kinds of homopolymer.For example, the terminal covalent coupling of a kind of homopolymer and second kind of homopolymer, different homopolymer produces " segmented copolymer ".The segmented copolymer that comprises homopolymer A and homopolymer B can be represented with the formula of following signal: (A)
x(B)
y, wherein (A)
xThe homopolymer of forming by x monomer A, (B)
yThe homopolymer of forming by y monomers B, and wherein two kinds of homopolymer combine by suitable covalent linkage or by connecting spacer groups.Though above-mentioned formula shows the segmented copolymer (that is, " Synthetic rubber, isoprene-styrene, hydrogenated, block, diblock ") that two block component are arranged, segmented copolymer also has three or more block component, and (for example, " triblock copolymer " schematically uses formula (A)
x(B)
y(A)
xExpression, or be expressed as A-B-A simply, and " segmented copolymer " can be according to the formula of illustrating (A-B)
nExpression.
As mentioned above, a kind of be fit to elastomerics grinding aid brick of the present invention may be by the multicomponent mixture preparation, these components comprise, especially the mixture of the ethene-alpha-olefin copolymer of ethylene-vinyl acetate copolymer and metallocene catalysis.As by those those of ordinary skill in the art understood, the normally available random copolymers of ethylene-vinyl acetate copolymer (also generally being called as " EVA "), yet the normally available Synthetic rubber, isoprene-styrene, hydrogenated, block, diblock of the catalytic ethene-alpha-olefin copolymer of metallocenes.Usually, ethylene-vinyl acetate component is a main ingredient; Yet the ethene-alpha-olefin copolymer of ethylene-vinyl acetate copolymer or metallocene catalysis may account for 100% of the highest multicomponent mixture.
As for the ethylene-vinyl acetate copolymer component, can be understood as and relate to one or more multipolymers derived from the reaction of the random copolymerization of acetic ester and ethene.Usually, ethylene-vinyl acetate copolymer contains its weight range of vinyl acetate component from 9% to 40%, usually density (gm/cc) scope from 0.92 to 0.96, melting index (ASTM 1238) scope from 0.3 to 43 usually, and fusing point (℃, by DSC) scope usually from 63 to 100.Ethylene-vinyl acetate copolymer can be any available EVA technical grade (for example, Elvax, Dupont Industrial Polymers, United States) that is easy to.
Component as for ethene-alpha-olefin copolymer, it can be interpreted as a kind of multipolymer, it is made up of the ethene-alpha-olefin copolymer of one or more metallocene catalysis usually, and more preferably, be from one or more ethylene-butene copolymers, ethene-hexene copolymer, and the ethene-alpha-olefin copolymer of selected metallocene catalysis in the ethylene-octene copolymer (it is any also can to classify as thermoplastic elastomer).Usually, the weight range from 2% to 30% of the alpha-olefin ingredients constitute multipolymer of ethene-alpha-olefin copolymer.And, the density of the ethene-alpha-olefin copolymer of metallocene catalysis (gm/cc) scope usually from 0.86 to 0.95, melt index (ASTM 1238) scope usually from 0.2 to 30, and fusing point (℃, by DSC) scope is usually from 50-120.In one embodiment, the ethene-alpha-olefin copolymer of metallocene catalysis comprises ethylene-octene copolymer (for example, Engage, Dupont Dow Elastomers, United States).
As by what those of ordinary skill in the art understood, use just to begin commercialization since about nineteen ninety for the initial stage based on the polymkeric substance that Metallocene catalysts technique produced.Yet, the more important thing is that the polymerization technique of metallocene allows to make the multipolymer with very specific tacticity of high relatively molecular weight (for example, isotaxy and syndiotactic polymer) now, and make the traditional C of almost any monomer-surmount
3To C
8Alkene-with point-device mode polymerization.(it should be noted that as by what those of ordinary skill in the art understood, metallocene is that a positively charged metal ion is clipped in two sandwich structures between the electronegative cyclopentadienyl).
In addition, those of ordinary skill in the art also recognizes: the catalyst technology based on metallocene has produced ethene-alpha-olefin copolymer, comprise that polyolefine " plastomer " or POps (are the names of Exxon ' s EXACT production line, it is to adopt EXXPOL exclusive right catalyst technology to make, Exxon Chemical, United States) and polyolefine " elastomerics " or POEs (be the name of Dupont Dow Elastomer ' sENGAGE production line, it is the Dupont DowElastomers LLC that adopts INSITE exclusive right catalyst technology to make, United States).These new polyolefin plastomers (POPs) and elastomerics (POEs) are considered to adopt the metallocene catalysis technology to make it to become possible lower molecular weight linear low density ethylene-alpha-olefin copolymer.In addition, above-mentioned definite any vinyl-alpha-olefin copolymer, or their composition all can be used for making in the various composition relevant with the corresponding to elastomerics grinding aid of the present invention brick.
In order to optimize working ability, various composition related to the present invention (for example, the mixture of the ethene-alpha-olefin copolymer of ethylene-vinyl acetate copolymer and metallocene catalysis) can be to a large extent and other mixed with polymers (though being selectable), and may with various oil, softening agent, filler, extender, and other special additives are compound.In fact, and as what understood by the those of ordinary skill of those polymkeric substance field of compounding, the various processing additives that can add any amount is to improve one or more physical propertys and the character of elastomerics grinding aid brick disclosed herein.These processing additives examples are at G hter R, M ü ller H, The Plastics Additives Handbook, 4
ThEd., Hanser Publishers, Munich, those (they all being quoted as a reference) of being identified among the Germany (1996) at this.
More specifically, in some embodiments, the various mixture of the ethene-alpha-olefin copolymer of ethylene-vinyl acetate copolymer and metallocene catalysis can also mix with the extending oil that comprises polyolefin oil.As employed in specification sheets of the present invention, term " extending oil " comprises and being added in the composition to reduce cost or to improve the carbonaceous material of physical properties.
In other embodiments, the various mixture of the ethene-alpha-olefin copolymer of ethylene-vinyl acetate copolymer and metallocene catalysis can also mix with processing additives.As employed in specification sheets of the present invention, term " processing additives " comprises any additive that helps complete processing, workability etc., and it improves the material of formation elastomerics grinding aid brick of the present invention and/or the performance characteristics of composition.For example, one or more other raw material can be mixed so that improve the workability and/or the performance characteristics of composition with whole compositions.Therefore, the term processing additives comprises stearic acid, zinc oxide, titanium oxide, organo-peroxide, or their any combination.In the other embodiment, for example " filler " of lime carbonate and so on also can mix with determined other components above one or more.
As by those of ordinary skill in the art understood, above determined component (they are all relevant with particular preferred embodiment of the present invention) may mix in the mode of the following example.At first, can be with the ethylene-vinyl acetic ester multipolymer of required weight percent and the ethene-alpha-olefin copolymer of metallocene catalysis, and the processing additives of aequum or other special pharmaceutical chemicals are added in first mixing tank of a suitable size (for example, 350 pounds of Capacity Henschel Mixer w/cooler) together.Before these mixtures of doing are being added to second continuous mixing device of suitable size, can and be heated to 80 °F (for example, by Colortronic MH 60 proportioners to one 4 inches FarrelContinuous Mixer) with its mixing.The rotation of the blade of second successive mixing tank (for example then, with 175 commentaries on classics/per minutes) so that make dry mixture at high temperature (for example, 340 °F) incorporate in the uniform melt, (for example add selected a certain amount of linking agent during this period, organo-peroxide) and whipping agent (for example, Cellmic C 121 compound) and further mixing.
Then the fused composition is shifted and further process to produce the uniform thin slice of desired thickness through the calendering machine.As by those of ordinary skill in the art understood, calender line comprises a large amount of raw material of extruding between the parallel roller of a pair of successive rotation synchronously, and this technology produces film or thin slice.After the rolling press calendering, then with the thermoforming in the thermoforming machine of uniform thin slice.That is to say that thin slice is transferred and further processes to produce the foam material thin slice by the thermoforming machine uniformly.Calendering and thermoforming all are used in the thermoplastics widely.
After calendering and thermoforming, the foam material thin slice is cut into a lot rectangular, and these rectangular the present invention of can be used as are suitable for the handheld grinding aid brick of bending or flat surfaces.In an embodiment preferred and as shown in Figure 1, the mixture of polymkeric substance and other component is processed to many rectangular, about 279 millimeters of its length, roomy about 35 millimeters, thick about 20 millimeters (that is L * W * T).These sizes have special advantage, and it is suitable for standard-sized sand paper, and it has suitable 8.5 " * 11 " that are of a size of, and in use need not cut and/or prune, and the surface energy of whole sand papering is utilized.More specifically, has the rectangular standard-sized sand paper outside that covers it tightly that makes of this size, shown in Fig. 2 A-B.
In order to illustrate not is restriction purpose of the present invention, and the following example more clearly discloses many aspects of the present invention.
Embodiment
Make handheld elastomerics grinding aid brick according to the process flow sheet described in Fig. 3.More specifically, still with reference to figure 3, with the ethylene-vinyl acetate copolymer of batch form with selected amount, pearl filler, stearic acid and zinc oxide mix, and stir and heat about 10 minutes, to produce the composition (step 300) of blended polymkeric substance.Next step, with the composition that the linking agent and the whipping agent of the organo-peroxide of selected amount mixes and stir into the blended polymkeric substance, restir two minutes is so that it forms charging (step 302).Then with charging with the calendering of two successive calendering machines: first machine is under the heating state (step 304) in order to the manufactured materials thin slice, yet second machine is used to the cooling material thin slice so that it forms specific thicknesses (step 306).To have specific thickness of material thin slice in containing the thermoforming machine of mould,, therefore produce the material sheet (step 308) of foaming in about 150 ℃ of heating thermoforming in about 30 minutes.The thin slice of foaming is cut and repairs (step 310) subsequently, and further cut into then and have about 279 millimeters long (L) in a large number, about 35 mm wides (W), about 20 mm thick (T) rectangular produces a large amount of elastomerics grinding aid bricks (step 312) with this.Elastomerics grinding aid brick is then through silk screen printing (silkscreened) (step 314), and packing (step 316).
Herein, embodiment content illustrated and that describe just illustrates grinding aid brick of the present invention, and under the situation that does not deviate from spirit of the present invention and essential characteristic, the present invention can implement with other concrete mode or other concrete form.Therefore, should to be considered to aspect all be illustrative and be not limited in this to embodiment described herein.Therefore, scope of the present invention is to illustrate by additional claim rather than the description by the front, and can bring the equivalent meanings of claim and all changes of scope all to be included in its scope the inside.
Claims (31)
1. the elastomerics grinding aid brick that is suitable for bending or flat surfaces, wherein elastomerics grinding aid brick has the ShoreA durometer level from about 45 to about 90, and elastomerics grinding aid brick is to be made by the composition of the polymkeric substance of various ingredients preparation:
The mixture of the ethene-alpha-olefin copolymer of a kind of ethylene-vinyl acetate copolymer and a kind of metallocene catalysis, wherein the quantity of mixture accounts for the scope from about 50% to about 100% of composition weight; With
It is about 5% that the weight range that a kind of whipping agent, its quantity account for composition can reach, and wherein whipping agent is the Cellmic C 121 compound.
2. the elastomerics grinding aid brick of claim 1, wherein multicomponent mixture also comprises filler.
3. the elastomerics grinding aid brick of claim 2, wherein the amount of filler accounts for the scope from about 5% to about 20% of composition weight.
4. the elastomerics grinding aid brick of claim 2, filler wherein is a lime carbonate.
5. the elastomerics grinding aid brick of claim 1, wherein multicomponent mixture also comprises processing additives.
6. the elastomerics grinding aid brick of claim 5, processing additives wherein is one or more of stearic acid, zinc oxide, titanium oxide and organo-peroxide.
7. the elastomerics grinding aid brick of claim 6, wherein the amount of processing additives accounts for the scope from about 0% to about 10% of composition weight.
8. the elastomerics grinding aid brick of claim 1, wherein the ethene-alpha-olefin copolymer of metallocene catalysis is an ethylene-butene copolymer, ethene-hexene copolymer, ethylene-octene copolymer, or their mixture.
9. the elastomerics grinding aid brick of claim 1, wherein the ethene-alpha-olefin copolymer of metallocene catalysis is an ethylene-octene copolymer.
The density of the elastomerics grinding aid brick of claim 1 be every cubic feet from about 10 to about 30 pounds.
11. the density of the elastomerics grinding aid brick of claim 1 is every cubic feet about 20 pounds.
12. the Shore A durometer level from about 50 to about 85 of the elastomerics grinding aid brick of claim 1.
13. the Shore A durometer level from about 60 to about 75 of the elastomerics grinding aid brick of claim 1.
14. the Shore A durometer level from about 65 to about 70 of the elastomerics grinding aid brick of claim 1.
15. the Shore A durometer level from about 60 to about 90 of the elastomerics grinding aid brick of claim 1.
16. one kind is suitable for crooked or smooth surface elasticity body grinding aid brick, the Shore A durometer level from about 45 to about 90 of elastomerics grinding aid brick wherein, and elastomerics grinding aid brick is that the composition of a kind of polymkeric substance of being mixed with by multicomponent mixture is made, and these multicomponent mixtures comprise:
The mixture of the ethene-alpha-olefin copolymer of a kind of ethylene-vinyl acetate copolymer and metallocene catalysis, wherein the amount of the mixture scope that accounts for composition weight from about 50% to about 100%;
A kind of whipping agent; With
Extending oil.
17. the elastomerics grinding aid brick of claim 16, multicomponent mixture wherein also comprises a kind of filler.
18. the elastomerics grinding aid brick of claim 16, wherein the amount of filler accounts for the scope from about 5% to about 20% of composition weight.
19. the elastomerics grinding aid brick of claim 17, filler wherein is a lime carbonate.
20. the elastomerics grinding aid brick of claim 16, multicomponent mixture wherein also comprises a kind of processing additives.
21. the elastomerics grinding aid brick of claim 20, processing additives wherein is one or more of stearic acid, zinc oxide, titanium oxide and organo-peroxide.
22. the elastomerics grinding aid brick of claim 21, wherein the amount of processing additives accounts for the scope from about 0% to about 10% of composition weight.
23. the elastomerics grinding aid brick of claim 16, wherein the amount of whipping agent accounts for composition weight scope from about 0% to about 5%.
24. the elastomerics grinding aid brick of claim 16, wherein the ethene-alpha-olefin copolymer of metallocene catalysis is ethylene-butene copolymer, ethene-hexene copolymer, ethylene-octene copolymer, or their mixture.
25. the elastomerics grinding aid brick of claim 16, wherein the ethene-alpha-olefin copolymer of metallocene catalysis is an ethylene-octene copolymer.
26. the density of the elastomerics grinding aid brick of claim 16 be every cubic feet from about 10 to about 30 pounds.
27. the density of the elastomerics grinding aid brick of claim 16 is every cubic feet about 20 pounds.
28. the elastomerics grinding aid brick of claim 16, wherein Shore A durometer level from about 50 to about 85.
29. the Shore A durometer level from about 60 to about 75 of the elastomerics grinding aid brick of claim 16.
30. the Shore A durometer level from about 65 to about 70 of the elastomerics grinding aid brick of claim 16.
31. the Shore A durometer level from about 60 to about 90 of the elastomerics grinding aid brick of claim 16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02156396.9A CN1267490C (en) | 2002-09-13 | 2002-09-13 | Hand-held grinder assistant brick adaptive diverse surfaces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02156396.9A CN1267490C (en) | 2002-09-13 | 2002-09-13 | Hand-held grinder assistant brick adaptive diverse surfaces |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1482169A true CN1482169A (en) | 2004-03-17 |
| CN1267490C CN1267490C (en) | 2006-08-02 |
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ID=34148816
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN02156396.9A Expired - Lifetime CN1267490C (en) | 2002-09-13 | 2002-09-13 | Hand-held grinder assistant brick adaptive diverse surfaces |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1267490C (en) |
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2002
- 2002-09-13 CN CN02156396.9A patent/CN1267490C/en not_active Expired - Lifetime
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| CN1267490C (en) | 2006-08-02 |
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