Patent US1477960A successfully refreshed from Google Patents.
Patent US4800685A successfully refreshed from Google Patents.
US4800685A
Expired / Lapsed
US
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Alumina bonded abrasive for cast iron
Assignee: 3M Co
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Filing: 1984-10-30
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Granted: 1989-01-31
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Expires: 2004-10-30
Abstract
Abstract This invention concerns the discovery that sol-gel process alumina abrasive grain provides superior performance in bonded abrasives for grinding cast iron. In a preferred form it is disclosed that bonded abrasives of sol-gel process alumina abrasives in combination with other abrasive grains such as those of silicon carbide and fused alumina also provide superior grinding of cast iron.
Inventors
- 👤 Douglas G. Haynes, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:59
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/1115; B; B24; B24B; B24B1/00; B24D; B24D3/00; B24D3/34; B24D3/346; C09; C09K; C09K3/00; C09K3/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
32 words
A method of abrading cast iron comprising providing a bonded abrasive, said bonded abrasive comprising sol-gel alumina grain in a matrix, and bringing said bonded abrasive into frictional contact with cast iron.
Claim 2
Independent Claim
32 words
A method of abrading cast iron comprising providing a bonded abrasive, said bonded abrasive comprising sol-gel alumina grain in a matrix, and bringing said bonded abrasive into frictional contact with cast iron.
Claim 3
Dependent Claim
12 words
The method of claim 1, wherein said matrix comprises a phenolic resin.
Claim 4
Dependent Claim
16 words
The method of claim 1, wherein said bonded abrasive is in the form of a wheel.
Claim 5
Dependent Claim
13 words
The method of claim 1, wherein said frictional contact is a snagging operation.
Claim 6
Dependent Claim
22 words
The method of claim 1, wherein said sol-gel abrasive is in a size range of between about 4 and about 100 grit.
Claim 7
Dependent Claim
12 words
The method of claim 1, wherein said matrix comprises a vitreous material.
Claim 8
Dependent Claim
14 words
The method of claim 1 wherein said bonded abrasive further comprises fused alumina grain.
Claim 9
Dependent Claim
26 words
The method of claim 7 wherein said sol-gel alumina comprises about 30 to about 70 weight percent of the total abrasive grain in said bonded abrasive.
References Cited (Backward Citations)
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Cited
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Cited
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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) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |