Patent US4828582A successfully refreshed from Google Patents.
US4828582A
Expired / Lapsed
US
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Polycrystalline abrasive grit
Assignee: Diamond Innovations Inc
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Filing: 1988-02-03
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Granted: 1989-05-09
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Expires: 2008-02-03
Abstract
Abstract Diamond or CBN polycrystalline abrasive grit useful in tools for grinding or cutting is made by size reducing and leaching non-diamond or non-CBN material from a compact to provide polycrystalline abrasive grit having a selected and having a network of inter-connected, empty pores dispersed throughout.
Inventors
- 👤 Robert H. Frushour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:01
CPC Classifications
B; B24; B24D; B24D3/00; B24D3/02; B24D3/04; B24D3/06; B24D3/10; C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1418
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
81 words
The method of making abrasive grit having a selected size within the range of from about 1 micron to about 1 cm. in diameter, said method comprising the steps of: (a) providing a polycrystalline compact substantially greater than said selected size and comprising self-bonded, abrasive particles selected from the group consisting of diamond and cubic boron nitride particles; (b) size reducing said compact by milling said compact into pieces having said selected size; and (c) leaching non-particle matter from said pieces.
Claim 2
Independent Claim
81 words
The method of making abrasive grit having a selected size within the range of from about 1 micron to about 1 cm. in diameter, said method comprising the steps of: (a) providing a polycrystalline compact substantially greater than said selected size and comprising self-bonded, abrasive particles selected from the group consisting of diamond and cubic boron nitride particles; (b) size reducing said compact by milling said compact into pieces having said selected size; and (c) leaching non-particle matter from said pieces.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein said grit is subjected to a blocking step and has an aspect ratio of less than 2 to 1.
Claim 4
Dependent Claim
17 words
The method of claim 2 wherein said particles of step (b) are subjected to a sizing step.
Claim 5
Dependent Claim
10 words
The method of claim 2 wherein said particles comprise diamond.
Claim 6
Dependent Claim
14 words
The method of claim 2 wherein step (b) is carried out before step (c).
Claim 7
Dependent Claim
15 words
The method of claim 2 wherein said compact is subjected to leaching before step (b).
Claim 8
Dependent Claim
16 words
The method of claim 2 wherein following step (c), said particles are bonded to a tool.
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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) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |