US5185012A
Expired / Lapsed
US
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Coated abrasive material containing abrasive filaments
Assignee: Saint Gobain Abrasives Inc
•
Filing: 1990-05-02
•
Granted: 1993-02-09
•
Expires: 2010-05-02
Abstract
Abstract Coated abrasive products having abrasive filaments of polycrystalline alumina.
Inventors
- 👤 Robert G. Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:51
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1436; B; B24; B24D; B24D11/00; B24D3/00
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
71 words
Coated abrasive material comprising: a. a backing member; and b. a layer of coated abrasive comprising: 1.) a maker coat; and 2.) a layer of a plurality of preshaped filamentary abrasive particles having a substantially uniform cross-sectional shape adhered to said backing member by said maker coat, said abrasive particles each being of a substantially uniform cross-section with an aspect ratio of at least 1:1 and comprising sintered alpha alumina crystals.
Claim 2
Dependent Claim
71 words
Coated abrasive material comprising: a. a backing member; and b. a layer of coated abrasive comprising: 1.) a maker coat; and 2.) a layer of a plurality of preshaped filamentary abrasive particles having a substantially uniform cross-sectional shape adhered to said backing member by said maker coat, said abrasive particles each being of a substantially uniform cross-section with an aspect ratio of at least 1:1 and comprising sintered alpha alumina crystals.
Claim 3
Dependent Claim
30 words
Coated abrasive material according to claim 1 wherein the said abrasive particles comprise sol gel alpha aluminum crystals with a density of at least about 90% of the theoretical density.
Claim 4
Dependent Claim
21 words
Coated abrasive material according to claim 1 wherein the said abrasive particles have a hardness of at least about 16 GPa.
Claim 5
Dependent Claim
16 words
Coated abrasive product according to claim 1 wherein the filamentary abrasive particles have a round cross-section.
Claim 6
Dependent Claim
27 words
Coated abrasive product according to claim 1 wherein the said filament-shaped particles on the said backing member have an average aspect ratio of at least about 2:1.
Claim 7
Dependent Claim
21 words
Coated abrasive product according to claim 1 wherein the hardness of the said abrasive filaments is at least about 18 GPa.
Claim 8
Dependent Claim
56 words
Coated abrasive material according to claim 6 wherein the sintered abrasive filaments have an aspect ratio averaging at least about 2:1 and each abrasive filament has a diameter of from about 0.05 to about 0.5 mm and said alpha alumina crystals are seeded sol gel crystals and have a size no greater than about 1 micron.
Claim 9
Dependent Claim
32 words
Coated abrasive material according to claim 7 wherein said filament shaped alumina abrasive particles comprise at least 95% of generally equiaxed crystals having a crystal size no greater than about 0.5 micron.
Claim 10
Dependent Claim
57 words
Coated abrasive material according to claim 1 wherein the said preshaped abrasive particles are abrasive filaments having a density at least 95% of the theoretical density, and includes up to 15% by weight of a member selected from the group consisting of spinel, mullite, manganese dioxide, titania, magnesia, ceria, zirconia, precursors of said oxides, and mixtures thereof.
Claim 11
Dependent Claim
27 words
Coated abrasive material according to claim 9 wherein said alpha alumina crystals are seeded sol gel alpha alumina crystals having a size of less than 1 micron.
Claim 12
Dependent Claim
26 words
Coated abrasive material according to claim 8 wherein at least some of the said filament shaped alumina based abrasive particles are curved in their longer dimension.
Claim 13
Dependent Claim
22 words
Coated abrasive material according to claim 8 wherein at lease some of the said abrasive filaments are twisted in their longer dimension.
Claim 14
Dependent Claim
28 words
Coated abrasive material according to claim 1 wherein the said preshaped abrasive particles are abrasive filaments of circular-shape, each said filament having a diameter of approximately 0.33 mm.
Claim 15
Dependent Claim
21 words
Coated abrasive material according to claim 13 wherein the said abrasive filaments have an aspect ratio averaging at least about 2:1.
Claim 16
Dependent Claim
51 words
Coated abrasive product comprising a backing member, a maker coat on said backing member, a layer of abrasive filaments adhered to said backing member by said maker coat, and a size coat overlaying said abrasive filaments in which a grinding aid is incorporated in a layer applied to the coated abrasive.
Claim 17
Dependent Claim
51 words
Coated abrasive product comprising a backing member, a maker coat on said backing member, a layer of abrasive filaments adhered to said backing member by said maker coat, and a size coat overlaying said abrasive filaments in which a grinding aid is incorporated in a layer applied to the coated abrasive.
Claim 18
Dependent Claim
17 words
Coated abrasive product according to claim 15 wherein the maker and size coats comprise a phenolic resin.
Claim 19
Dependent Claim
20 words
Coated abrasive product according to claim 15 wherein the abrasive filaments have an aspect ratio averaging at least about 2:1.
Claim 20
Dependent Claim
16 words
Coated abrasive product according to claim 17 wherein the abrasive filaments are circular shape in cross-section.
Claim 21
Dependent Claim
21 words
Coated abrasive product according to claim 17 wherein the abrasive product is a disc and the backing member is vulcanized fibre.
Claim 22
Dependent Claim
22 words
Coated abrasive product according to claim 17 wherein the abrasive filaments have an average aspect ratio of from about 2:1 to 8:1.
Claim 23
Dependent Claim
26 words
Coated abrasive product according to claim 17 wherein the abrasive filaments have a diameter approximately 0.33 mm and a hardness of at least about 19 GPa.
Claim 24
Dependent Claim
38 words
Coated abrasive material according to claim 1 in which the surface of the backing member receives from about 40 to about 60% of the theoretical weight of the filamentary sintered alumina particles required to form a closed coat.
Claim 25
Dependent Claim
36 words
Coated abrasive material according to claim 2 wherein the surface of the backing member receives from about 40 to 60% of the theoretical weight of the filamentary sintered alumina particles required to form a closed coat.
Claim 26
Dependent Claim
26 words
Coated abrasive product according to claim 1 in which a plurality of layers of abrasive are used and the last-applied layer comprises the filamentary abrasive particles.
Claim 27
Dependent Claim
30 words
Coated abrasive product according to claim 1 in which the layer of coated abrasive comprises up to 40%, based on the weight of the abrasive present of non-filamentary abrasive particles.
Claim 28
Dependent Claim
34 words
Coated abrasive products according to claim 1 in which at least a portion of the filamentary particles, when in use, have a rake angle with respect to a work piece of close to zero.
Claim 29
Dependent Claim
31 words
Coated abrasive products according to claim 1 in which at least a portion of the filamentary particles are in groups in which the component filaments lay against and buttress one another.
Claim 30
Dependent Claim
23 words
Coated abrasive products according to claim 1 in which the filamentary particles have a breaking strength of at least 8,000 kg/cm 2 .
Claim 31
Dependent Claim
22 words
Coated abrasive products according to claim 1 in which a layer comprising a grinding aid is applied to the coated abrasive layer.
Claim 32
Dependent Claim
36 words
Coated abrasive material according to claim 15 in which the surface of the backing number receives from about 40 to about 60% of the theoretical weight of the filamentary particles required to form a closed coat.
Claim 33
Dependent Claim
26 words
Coated abrasive product according to claim 15 in which a plurality of layers of abrasive are used and the last-applied layer comprises the filamentary abrasive particles.
Claim 34
Dependent Claim
30 words
Coated abrasive product according to claim 15 in which the layer of coated abrasive comprises up to 40%, based on the weight of the abrasive present, of non-filamentary abrasive particles.
Claim 35
Dependent Claim
34 words
Coated abrasive products according to claim 15 in which at least a portion of the filamentary particles, when in use, have a rake angle with respect to a work piece of close to zero.
Claim 36
Dependent Claim
31 words
Coated abrasive products according to claim 15 in which at least a portion of the filamentary particles are in groups in which the component filaments lay against and buttress one another.
Claim 37
Dependent Claim
23 words
Coated abrasive products according to claim 15 in which the filamentary particles have a breaking strength of at least 8,000 kg/cm 2 .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-02-09 | 1996-08-10 | 1997-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-02-09 | 2000-08-10 | 2001-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-02-09 | 2004-08-10 | 2005-02-09 | $7700.00 | Window Closed / Lapsed |