US4954140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasives, abrasive tools, and grinding method
Assignee: Toppan Infomedia Co Ltd
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Filing: 1989-01-23
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Granted: 1990-09-04
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Expires: 2009-01-23
Abstract
Abstract A composite spherical-particle abrasive comprises spherical particles and abrasive particles, each spherical particle being coated with a plurality of abrasive particles. The composite abrasive particles are dispersed in a binder resin, and the dispersion is applied as an abrasive layer or coat to a backing to provide an abrasive tool. A grinding method uses such a composite spherical-particle abrasive tool.
Inventors
- 👤 Norimichi Kawashima
- 👤 Kazuya Orii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:41
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1436; B; B24; B24D; B24D11/00; B24D3/00; B24D3/02; B24D3/20; B24D3/28
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
55 words
A composite spherical-particle abrasive comprising spherical particles of a solid polymer having an average diameter of less than about 20 μm and abrasive particles having an average diameter of 0.01 to about 5 μm but less than the average diameter of said spherical particles, each of said spherical particle being coated with said abrasive particles.
Claim 2
Dependent Claim
55 words
A composite spherical-particle abrasive comprising spherical particles of a solid polymer having an average diameter of less than about 20 μm and abrasive particles having an average diameter of 0.01 to about 5 μm but less than the average diameter of said spherical particles, each of said spherical particle being coated with said abrasive particles.
Claim 3
Dependent Claim
83 words
A flexible abrasive tool comprising a flexible backing film and an abrasive layer formed thereon, said abrasive layer being made of a dispersion in a binder resin of a composite spherical-particle abrasive comprising spherical particles of a solid polymer having an average diameter of less than about 20 μm and abrasive particles having an average diameter of 0.01 to about 5 μm but less than the average diameter of said spherical particles, each of said spherical particles being coated with said abrasive particles.
Claim 4
Dependent Claim
83 words
A flexible abrasive tool comprising a flexible backing film and an abrasive layer formed thereon, said abrasive layer being made of a dispersion in a binder resin of a composite spherical-particle abrasive comprising spherical particles of a solid polymer having an average diameter of less than about 20 μm and abrasive particles having an average diameter of 0.01 to about 5 μm but less than the average diameter of said spherical particles, each of said spherical particles being coated with said abrasive particles.
Claim 5
Dependent Claim
60 words
A grinding method which uses a composite spherical-particle abrasive comprising spherical particles of a solid polymer having an average diameter of less than about 20 μm and abrasive particles having an average diameter of 0.01 to about 5 μm but less than the average diameter of said spherical particles, each of said spherical particles being coated with said abrasive particles.
Claim 6
Dependent Claim
60 words
A grinding method which uses a composite spherical-particle abrasive comprising spherical particles of a solid polymer having an average diameter of less than about 20 μm and abrasive particles having an average diameter of 0.01 to about 5 μm but less than the average diameter of said spherical particles, each of said spherical particles being coated with said abrasive particles.
Claim 7
Dependent Claim
42 words
A flexible abrasive tool as recited in claim 2 wherein said backing film is a plastic film having a thickness which does not exceed about 75 μm and wherein said abrasive layer has a thickness of about 5 to about 20 μm.
Claim 8
Dependent Claim
23 words
A composite spherical-particle abrasive as recited in claim 1 wherein said abrasive particles have an average diameter of 0.01 to about 2 μm.
Claim 9
Dependent Claim
24 words
A composite spherical-particle abrasive as recited in claim 5 wherein said solid polymer has an average diameter of about 4.5 to about 5.5 μm.
Claim 10
Dependent Claim
24 words
A composite spherical-particle abrasive as recited in claim 6 wherein said abrasive particles have an average diameter of about 0.3 to about 0.5 μm.
Claim 11
Dependent Claim
23 words
A flexible abrasive tool as recited in claim 2 wherein said abrasive particles have an average diameter of 0.01 to about 2 μm.
Claim 12
Dependent Claim
24 words
A flexible abrasive tool as recited in claim 8 wherein said solid polymer has an average diameter of about 4.5 to about 5.5 μm.
Claim 13
Dependent Claim
24 words
A flexible abrasive tool as recited in claim 9 wherein said abrasive particles have an average diameter of about 0.3 to about 0.5 μm.
Claim 14
Dependent Claim
42 words
A flexible abrasive tool as recited in claim 10 wherein said backing film is a plastic film having a thickness which does not exceed about 75 μm and wherein said abrasive layer has a thickness of about 5 to about 20 μm.
Claim 15
Dependent Claim
22 words
A grinding method as recited in claim 3 wherein said abrasive particles have an average diameter of 0.01 to about 2 μm.
Claim 16
Dependent Claim
23 words
A grinding method as recited in claim 12 wherein said solid polymer has an average diameter of about 4.5 to about 5.5 μm.
Claim 17
Dependent Claim
23 words
A grinding method as recited in claim 13 wherein said abrasive particles have an average diameter of about 0.3 to about 0.5 μm.
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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) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |