US4776861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycrystalline abrasive grit
Assignee: General Electric Co
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Filing: 1986-07-23
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Granted: 1988-10-11
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Expires: 2006-07-23
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 greater than 1,000 microns in diameter to provide polycrystalline abrasive grit having a size of from about 1 to about 1,000 microns in diameter 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 04:14
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1418; B; B24; B24D; B24D3/00; B24D3/02; B24D3/04; B24D3/06; B24D3/10
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
61 words
Abrasive grit made by the process of: (a) providing a polycrystalline compact greater than 1,000 microns in diameter and comprising self-bonded, abrasive particles selected from the group consisting of diamond and cubic boron nitride particles; (b) size reducing said compact to a size of from about 1 to about 1,000 microns in diameter; and (c) leaching non-particle matter from said compact.
Claim 2
Dependent Claim
61 words
Abrasive grit made by the process of: (a) providing a polycrystalline compact greater than 1,000 microns in diameter and comprising self-bonded, abrasive particles selected from the group consisting of diamond and cubic boron nitride particles; (b) size reducing said compact to a size of from about 1 to about 1,000 microns in diameter; and (c) leaching non-particle matter from said compact.
Claim 3
Dependent Claim
12 words
The abrasive grit of claim 1 wherein said abrasive grit comprises diamond.
Claim 4
Dependent Claim
14 words
The abrasive grit of claim 1 wherein said abrasive grit comprises cubic boron nitride.
Claim 5
Dependent Claim
23 words
The abrasive grit of claim 1 wherein said abrasive grit has a size of from about 20 to about 1,000 microns in diameter.
Claim 6
Dependent Claim
15 words
The abrasive grit of claim 1 wherein step (b) is carried out before step (c).
Claim 7
Dependent Claim
15 words
The abrasive grit of claim 1 wherein step (c) is carried out before step (b).
Claim 8
Dependent Claim
29 words
The abrasive grit of claim 1 wherein said grit has been subjected to an additional step of blocking and has an aspect ratio of less than 2 to 1.
Claim 9
Dependent Claim
18 words
The abrasive grit of claim 1 wherein said grit has been subjected to an additional step of sizing.
Claim 10
Dependent Claim
74 words
A tool comprising abrasive grit imbedded in a binding medium, said abrasive grit having been made by the steps of: (a) providing a polycrystalline compact greater than 1,000 microns in diameter and comprising self-bonded, abrasive particles selected from the group consisting of diamond and cubic boron nitride particles; (b) size reducing said compact to a size of from about 1 to about 1,000 microns in diameter; and (c) leaching non-particle matter from said compact.
Claim 11
Dependent Claim
74 words
A tool comprising abrasive grit imbedded in a binding medium, said abrasive grit having been made by the steps of: (a) providing a polycrystalline compact greater than 1,000 microns in diameter and comprising self-bonded, abrasive particles selected from the group consisting of diamond and cubic boron nitride particles; (b) size reducing said compact to a size of from about 1 to about 1,000 microns in diameter; and (c) leaching non-particle matter from said compact.
Claim 12
Dependent Claim
11 words
The tool of claim 9 wherein said abrasive grit comprises diamond.
Claim 13
Dependent Claim
13 words
The tool of claim 9 wherein said abrasive grit comprises cubic boron nitride.
Claim 14
Dependent Claim
22 words
The tool of claim 9 wherein said abrasive grit has a size of from about 20 to about 1,000 microns in diameter.
Claim 15
Dependent Claim
14 words
The tool of claim 9 wherein step (b) is carried out before step (c).
Claim 16
Dependent Claim
14 words
The tool of claim 9 wherein step (c) is carried out before step (b).
Claim 17
Dependent Claim
28 words
The tool of claim 9 wherein said grit has been subjected to an additional step of blocking and has an aspect ratio of less than 2 to 1.
Claim 18
Dependent Claim
17 words
The tool of claim 9 wherein said grit has been subjected to an additional step of sizing.
Claim 19
Dependent Claim
13 words
The tool of claim 9 wherein said binding medium is a metal binder.
Claim 20
Dependent Claim
13 words
The tool of claim 9 wherein said binding medium is a resin binder.
Claim 21
Dependent Claim
13 words
The tool of claim 9 wherein said binding medium is a vitreous binder.
Claim 22
Dependent Claim
13 words
The tool of claim 9 wherein said binding medium is a plated binder.
Claim 23
Dependent Claim
12 words
The tool of claim 9 wherein said tool is a saw blade.
Claim 24
Dependent Claim
12 words
The tool of claim 9 wherein said tool is a grinding wheel.
Claim 25
Dependent Claim
11 words
The tool of claim 9 wherein said tool is a drill.
Claim 26
Independent Claim
64 words
The method of making abrasive grit comprising the steps of: (a) providing a polycrystalline compact greater than 1,000 microns in diameter and comprising self-bonded, abrasive particles selected from the group consisting of diamond and cubic boron nitride particles; (b) size reducing said compact to a size of from about 1 to about 1,000 microns in diameter; and (c) leaching non-particle matter from said compact.
Claim 27
Independent Claim
64 words
The method of making abrasive grit comprising the steps of: (a) providing a polycrystalline compact greater than 1,000 microns in diameter and comprising self-bonded, abrasive particles selected from the group consisting of diamond and cubic boron nitride particles; (b) size reducing said compact to a size of from about 1 to about 1,000 microns in diameter; and (c) leaching non-particle matter from said compact.
Claim 28
Dependent Claim
26 words
The method of claim 24 wherein said grit has been subjected to a blocking step and has an aspect ratio of less than 2 to 1.
Claim 29
Dependent Claim
17 words
The method of claim 24 wherein said particles of step (b) are subjected to a sizing step.
Claim 30
Dependent Claim
22 words
The method of claim 24 wherein said particles are reduced in size to from about 20 to about 1,000 microns in diameter.
Claim 31
Dependent Claim
10 words
The method of claim 24 wherein said particles are diamond.
Claim 32
Dependent Claim
14 words
The method of claim 24 wherein step (b) is carried out before step (c).
Claim 33
Dependent Claim
14 words
The method of claim 24 wherein step (c) is carried out before step (b).
Claim 34
Dependent Claim
16 words
The method of claim 24 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) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |