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Patent US3982359A successfully refreshed from Google Patents.
US3982359A
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Abrasive member of bonded aggregates in an elastomeric matrix
Assignee: Roc AG
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Filing: 1975-06-10
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Granted: 1976-09-28
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Expires: 1995-06-10
Abstract
Abstract Abrasive grains rigidly bonded to each other form aggregates which are dispersed in a resilient matrix of an abrasive wheel so that the aggregates do not significantly interfere with each other's individual movement under grinding stresses against the resilient restraint of the matrix. The wheels remove metal from a workpiece much faster and lose less abrasive material than corresponding wheels in which the same abrasive particles are individually embedded in the same matrix.
Inventors
- 👤 Karl Elbel
- 👤 Kurt Wolfinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:27
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1436
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
A shaped, flexible, resilient abrasive member essentially consisting of a matrix of elastomeric material and a plurality of aggregates embedded in said matrix in spaced relationship and bonded to each other by said material, each aggregate essentially consisting of a multiplicity of grains of abrasive material and of a bonding agent more rigid than said elastomeric material and bonding said grains to each other, said matrix having a Shore A hardness of 75 to 20, and said aggregates having a Shore D hardness of at least 65.
Claim 2
Dependent Claim
87 words
A shaped, flexible, resilient abrasive member essentially consisting of a matrix of elastomeric material and a plurality of aggregates embedded in said matrix in spaced relationship and bonded to each other by said material, each aggregate essentially consisting of a multiplicity of grains of abrasive material and of a bonding agent more rigid than said elastomeric material and bonding said grains to each other, said matrix having a Shore A hardness of 75 to 20, and said aggregates having a Shore D hardness of at least 65.
Claim 3
Dependent Claim
21 words
A member as set forth in claim 1, wherein the size of each aggregate is between 2 mm and 10 mm.
Claim 4
Dependent Claim
16 words
A member as set forth in claim 2, wherein said size is at least 4 mm.
Claim 5
Dependent Claim
15 words
A member as set forth in claim 2, wherein said member is an abrasive wheel.
Claim 6
Dependent Claim
23 words
A member as set forth in claim 4, wherein the weight ratio of said matrix to said aggregates is between 0.5:1 and 1.25:1.
Claim 7
Dependent Claim
27 words
A member as set forth in claim 5, wherein the weight ratio of said grains to said bonding agent in said aggregates is between 20:1 and 3:1.
Claim 8
Dependent Claim
18 words
A member as set forth in claim 2, wherein said elastomeric material essentially consists of a synthetic rubber.
Claim 9
Dependent Claim
18 words
A member as set forth in claim 7, wherein said bonding agent essentially consists of a phenol-formaldehyde resin.
Claim 10
Dependent Claim
20 words
A member as set forth in claim 2, wherein the size of said grains is not greater than 20 grit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |