Patent US2681086A successfully refreshed from Google Patents.
Patent US5028242A successfully refreshed from Google Patents.
US5028242A
Expired / Lapsed
US
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Lapping member and lapping tape
Assignee: HGST Japan Ltd
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Filing: 1989-06-21
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Granted: 1991-07-02
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Expires: 2009-06-21
Abstract
Abstract A method of producing a magnetic disk by lapping a magnetic disk medium, comprising the steps of: preparing a lapping tape having an abrasive particle layer provided with abrasive particle clusters and chip pockets formed between adjacent two clusters, each of said clusters having abrasive particles of Al 2 O 3 or SiC and abrasive particles of diamond, lapping the surface of said magnetic disk medium by using the thus prepared lapping tape.
Inventors
- 👤 Yasushi Ito
- 👤 Masaaki Imamura
- 👤 Yoshiki Kato
- 👤 Jun Fumioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:11
CPC Classifications
B; B24; B24B; B24B37/00; B24B37/04; B24B37/07; B24B37/08; B24B7/00; B24B7/10; B24B7/16; B24B7/17; B24D; B24D11/00; B24D11/001; B24D3/00; B24D3/34; B24D3/346; G; G11; G11B; G11B5/00; G11B5/84; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/259
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
33 words
A lapping member comprising: a substrate; and an abrasive layer formed on the substrate, said abrasive layer having at least two kinds of abrasive particles, which kinds differ from each other in hardness.
Claim 2
Dependent Claim
33 words
A lapping member comprising: a substrate; and an abrasive layer formed on the substrate, said abrasive layer having at least two kinds of abrasive particles, which kinds differ from each other in hardness.
Claim 3
Dependent Claim
29 words
A lapping member as claimed in claim 1, wherein the abrasive particles consist of diamond, and one selected from the group consisting of Al 2 O 3 and SiC.
Claim 4
Dependent Claim
49 words
A lapping member as claimed in claim 2, wherein the content of the diamond is not more than about 10 wt. %, the content of said one selected from the group consisting of Al 2 O 3 and SiC being in a range of about 40% to about 89%.
Claim 5
Dependent Claim
28 words
A lapping member as claimed in claim 3, wherein the abrasive particles exist in a form of clusters in the abrasive layer, recesses being formed between the clusters.
Claim 6
Dependent Claim
25 words
A lapping member as claimed in claim 1, wherein the abrasive particles consist of diamond and a substance having a hardness lower than the diamond.
Claim 7
Dependent Claim
33 words
A lapping tape comprising: a substrate; and an abrasive layer formed on the substrate, said abrasive layer having at least two kinds of abrasive particles, which kinds differ from each other in hardness.
Claim 8
Dependent Claim
33 words
A lapping tape comprising: a substrate; and an abrasive layer formed on the substrate, said abrasive layer having at least two kinds of abrasive particles, which kinds differ from each other in hardness.
Claim 9
Dependent Claim
29 words
A lapping tape as claimed in claim 6, wherein the abrasive particles consist of diamond, and one selected from the group consisting of Al 2 O 3 and SiC.
Claim 10
Dependent Claim
49 words
A lapping tape as claimed in claim 7, wherein the content of the diamond is not more than about 10 wt. %, the content of said one selected from the group consisting of Al 2 O 3 and SiC being in a range of about 40% to about 89%.
Claim 11
Dependent Claim
28 words
A lapping tape as claimed in claim 8, wherein the abrasive particles exist in a form of clusters in the abrasive layer, recesses being formed between the clusters.
Claim 12
Dependent Claim
25 words
A lapping tape as claimed in claim 6, wherein the abrasive particles consist of diamond and a substance having a hardness lower than the diamond.
Claim 13
Dependent Claim
73 words
A lapping tape comprising: a substrate made of a tape; and an abrasive layer provided on the substrate and having abrasive particle clusters and chip pockets formed between adjacent two clusters, each of said clusters having about 40% to about 89% by weight abrasive particles of Al 2 O 3 or SiC, abrasive particles of less than about 10% by weight diamond and a binder resin bonding these abrasive particles to each other.
Claim 14
Dependent Claim
73 words
A lapping tape comprising: a substrate made of a tape; and an abrasive layer provided on the substrate and having abrasive particle clusters and chip pockets formed between adjacent two clusters, each of said clusters having about 40% to about 89% by weight abrasive particles of Al 2 O 3 or SiC, abrasive particles of less than about 10% by weight diamond and a binder resin bonding these abrasive particles to each other.
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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) | 1994-07-01 | 1994-12-31 | 1995-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-01 | 1998-12-31 | 1999-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-01 | 2002-12-31 | 2003-07-02 | $7700.00 | Window Closed / Lapsed |