Patent US4555250A successfully refreshed from Google Patents.
US4555250A
Expired / Lapsed
US
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Grinding sheet and process for preparing same
Assignee: Resonac Holdings Corp
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Filing: 1984-05-29
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Granted: 1985-11-26
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Expires: 2004-05-29
Abstract
Abstract A glass-grinding sheet is prepared by a process wherein 100 wt. parts of a powdery metal composition consisting of, based on the weight of the composition, 80-96.8% copper, 3-15% of tin and/or zinc, and 0.2-5% of nickel and/or titanium, are mixed with 0.5-30 wt. parts of a diamond powder; the mixture is sintered; and then, the obtained sintered body is rolled into a sheet of the desired thickness. The powdery metal composition is either a copper alloy consisting of (a) copper, (b) tin and/or zinc and (c) nickel and/or titanium, or a mixture of a copper alloy consisting of (a) copper and (b) tin and/or zinc, with (c) nickel and/or titanium.
Inventors
- 👤 Shin'ichi Horie
- 👤 Yutaka Matsuzaki
- 👤 Fumio Kagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:36
CPC Classifications
B; B24; B24D; B24D11/00; B24D11/001; B24B; B24B13/00; B24B13/01; B24D3/00; B24D3/02; B24D3/04; B24D3/06; B24D3/34; B24D3/342; C; C22; C22C; C22C26/00
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
143 words
In a process for the preparation of a glass-grinding sheet, which comprises the steps of: mixing 100 parts by weight of a powdery metal composition comprising copper and at least one metal selected from the group consisting of tin and zinc, with 0.5 to 30 parts by weight of a diamond powder; sintering the mixture; and then rolling the obtained sintered body; wherein said improvement comprises: providing said powdery metal composition with a content consisting of, based on the weight of the composition: 80 to 96.8% of copper, 3to 15% of at least one metal selected from the group consisting of tin and zinc, and 0.2 to 5% of at least one metal selected from the group consisting of nickel and titanium, and at least the copper and said metal selected from tin and zinc in the powdery metal composition constituting an alloy.
Claim 2
Dependent Claim
143 words
In a process for the preparation of a glass-grinding sheet, which comprises the steps of: mixing 100 parts by weight of a powdery metal composition comprising copper and at least one metal selected from the group consisting of tin and zinc, with 0.5 to 30 parts by weight of a diamond powder; sintering the mixture; and then rolling the obtained sintered body; wherein said improvement comprises: providing said powdery metal composition with a content consisting of, based on the weight of the composition: 80 to 96.8% of copper, 3to 15% of at least one metal selected from the group consisting of tin and zinc, and 0.2 to 5% of at least one metal selected from the group consisting of nickel and titanium, and at least the copper and said metal selected from tin and zinc in the powdery metal composition constituting an alloy.
Claim 3
Dependent Claim
19 words
A process according to claim 1, wherein said powdery metal composition comprises 85 to 95% by weight of copper.
Claim 4
Dependent Claim
31 words
A process according to claim 1, wherein said powdery metal composition comprises 4.5 to 10% by weight of at least one metal selected from the group consisting of tin and zinc.
Claim 5
Dependent Claim
31 words
A process according to claim 1, wherein said powdery metal composition comprises 0.5 to 5% by weight of at least one metal selected from the group consisting of nickel and titanium.
Claim 6
Dependent Claim
14 words
A process according to claim 1, wherein said powdery metal composition is an alloy.
Claim 7
Dependent Claim
51 words
A process according to claim 1, wherein said powdery metal composition is a mixture composed of (i) an alloy consisting of copper and at least one metal selected from the group consisting of tin and zinc, and (ii) at least one metal selected from the group consisting of nickel and titanium.
Claim 8
Dependent Claim
34 words
A process according to claim 1, wherein the powdery metal composition and the diamond powder are mixed together with 5% by weight, based on the weight of the resulting mixture, of a solid lubricant.
Claim 9
Dependent Claim
27 words
A process according to claim 7, wherein the amount of the solid lubricant is 1 to 5% by weight based on the weight of the resulting mixture.
Claim 10
Dependent Claim
25 words
A process according to claim 7, wherein the solid lubricant is selected from the group consisting of graphite, molybdenum disulfide, boron nitride, agalmatolite and mica.
Claim 11
Dependent Claim
36 words
A process according to claim 1, wherein said powdery metal composition has a grain size of up to about 180 μm and said diamond powder has a grain size of about 2 to about 180 μm.
Claim 12
Dependent Claim
24 words
A process according to claim 1, wherein said mixture is sintered at a temperature of from 650° to 900° C. in a reducing atmosphere.
Claim 13
Dependent Claim
32 words
A process according to claim 1, wherein said mixture of the powdery metal composition and the diamond powder is sintered under a load of about 20 to about 50 g/cm 2 .
Claim 14
Dependent Claim
32 words
A process according to claim 1, wherein the sintered body is rolled into a sheet having a thickness of from 0.1 to 0.5 mm and a porosity of from 5 to 20%.
Claim 15
Dependent Claim
21 words
A process according to claim 13, wherein the obtained sheet is annealed at a temperature of from 750° to 850° C.
Claim 16
Dependent Claim
20 words
A process according to claim 14, wherein the obtained sheet is cut into a desired shape before or after annealing.
Claim 17
Dependent Claim
143 words
In a glass-grinding sheet which is prepared by a process comprising the steps of: mixing 100 parts by weight of a powdery metal composition comprising copper and at least one metal selected from the group consisting of tin and zinc, with 0.5 to 30 parts by weight of a diamond powder; sintering the mixture; and then rolling the obtained sintered body; wherein said improvement comprises: providing said powdery metal composition with a content consisting of, based on the weight of the composition: 80 to 96.8% of copper, 3 to 15% of at least one metal selected from the group consisting of tin and zinc, and 0.2 to 5% of at least one metal selected from the group consisting of nickel and titanium, and at least the copper and said metal selected from tin and zinc in the powdery metal composition constituting an alloy.
Claim 18
Dependent Claim
143 words
In a glass-grinding sheet which is prepared by a process comprising the steps of: mixing 100 parts by weight of a powdery metal composition comprising copper and at least one metal selected from the group consisting of tin and zinc, with 0.5 to 30 parts by weight of a diamond powder; sintering the mixture; and then rolling the obtained sintered body; wherein said improvement comprises: providing said powdery metal composition with a content consisting of, based on the weight of the composition: 80 to 96.8% of copper, 3 to 15% of at least one metal selected from the group consisting of tin and zinc, and 0.2 to 5% of at least one metal selected from the group consisting of nickel and titanium, and at least the copper and said metal selected from tin and zinc in the powdery metal composition constituting an alloy.
Claim 19
Dependent Claim
27 words
A glass-grinding sheet according to claim 16, wherein said sheet has a thickness of from 0.1 to 0.4 mm and a porosity of from 5 to 20%.
Claim 20
Dependent Claim
24 words
A glass-grinding sheet according to claim 16, wherein said sheet has at least three notches extending from the periphery thereof toward the center thereof.
Claim 21
Dependent Claim
61 words
A glass-grinding sheet according to claim 18, wherein said sheet further has a plurality of small holes having a diameter of from about 1 to about 5 mm, the total area of said small holes being in the range of from about 10 to about 40% based on the total area of the sheet (exclusive of the area of the notches).
Claim 22
Dependent Claim
20 words
A glass-grinding sheet according to claim 19, wherein said sheet further has a notch perforated in the central portion thereof.
Claim 23
Dependent Claim
15 words
A glass-grinding sheet according to claim 16, wherein said sheet has an equilateral hexagonal form.
Claim 24
Dependent Claim
36 words
A glass-grinding sheet according to claim 16, wherein said sheet has a long ellipsoidal shape wherein the ratio of the major axis length to the minor axis length is in the range from 5 to 20.
References Cited (Backward Citations)
US4010583A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |