Patent US4278448A successfully refreshed from Google Patents.
US4278448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diamond abrasive grits
Assignee: Individual
•
Filing: 1979-05-31
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Granted: 1981-07-14
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Expires: 1999-05-31
Abstract
Abstract An abrasive tool for grinding a combined workpiece of a steel with an ultrahard alloy, comprising a grinding wheel comprising a resinoid binding wheel and synthetic diamond abrasive grits held therein, said grits being characterized by selected combinations of grit size, bulk density and grit strength.
Inventors
- 👤 Hiroshi Ishizuka
- 👤 Kazuo Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:55
CPC Classifications
B; B24; B24D; B24D3/00; B24D3/02; B24D3/20; B24D3/28; C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
171 words
An abrasive tool for grinding a combined workpiece of a steel with an ultrahard alloy, comprising a grinding wheel comprising a resinoid binding material and synthetic diamond abrasive grits held therein, said abrasive grits being selected from one of the combinations of the grit size, bulk density and grit strength as listed in the following: ______________________________________
Combi- Grit Size Bulk Density Grit Strength
nation mesh/in g/cc % by wt./sec
______________________________________
1 60 to 80 1.80 to 1.88 38 to 50/45
2 80 to 100 1.80 to 1.88 38 to 50/60
3 100 to 120 1.80 to 1.88 38 to 50/75
4 120 to 140 1.78 to 1.88 38 to 50/90
5 140 to 170 1.78 to 1.88 38 to 50/120
6 170 to 200 1.78 to 1.85 38 to 50/150
7 200 to 230 1.78 to 1.85 38 to 50/180
8 230 to 270 1.75 to 1.83 38 to 50/210
9 270 to 325 1.75 to 1.83 38 to 50/230
10 325 to 400 1.72 to 1.80 38 to 50/270
______________________________________
Claim 2
Dependent Claim
171 words
An abrasive tool for grinding a combined workpiece of a steel with an ultrahard alloy, comprising a grinding wheel comprising a resinoid binding material and synthetic diamond abrasive grits held therein, said abrasive grits being selected from one of the combinations of the grit size, bulk density and grit strength as listed in the following: ______________________________________
Combi- Grit Size Bulk Density Grit Strength
nation mesh/in g/cc % by wt./sec
______________________________________
1 60 to 80 1.80 to 1.88 38 to 50/45
2 80 to 100 1.80 to 1.88 38 to 50/60
3 100 to 120 1.80 to 1.88 38 to 50/75
4 120 to 140 1.78 to 1.88 38 to 50/90
5 140 to 170 1.78 to 1.88 38 to 50/120
6 170 to 200 1.78 to 1.85 38 to 50/150
7 200 to 230 1.78 to 1.85 38 to 50/180
8 230 to 270 1.75 to 1.83 38 to 50/210
9 270 to 325 1.75 to 1.83 38 to 50/230
10 325 to 400 1.72 to 1.80 38 to 50/270
______________________________________
Claim 3
Dependent Claim
32 words
An abrasive tool for grinding a combined workpiece of a steel with an ultrahard alloy as claimed in claim 1, wherein the synthetic diamond abrasive grits have a metallic coating formed thereon.
Claim 4
Dependent Claim
29 words
An abrasive tool for grinding a combined workpiece of a steel with an ultrahard alloy as claimed in claim 2, wherein the metallic coating consists of a single layer.
Claim 5
Dependent Claim
28 words
An abrasive tool for grinding a combined workpiece of a steel with an ultrahard alloy as claimed in claim 3, wherein the layer consists of a nickel deposition.
Claim 6
Dependent Claim
28 words
An abrasive tool for grinding a combined workpiece of a steel with an ultrahard alloy as claimed in claim 3, wherein the layer consists of a cobalt deposition.
Claim 7
Dependent Claim
51 words
An abrasive tool for grinding a combined workpiece of a steel with an ultrahard alloy as claimed in claim 3, wherein the metallic coating consists of three sequent layers: the innermost and the outer ones having a dense and even surface, and the middle one having a ragged and uneven surface.
Claim 8
Dependent Claim
31 words
An abrasive tool for grinding a combined workpiece of a steel with an ultrahard alloy as claimed in claim 6, wherein each of the three layers consists of a nickel deposition.
Claim 9
Dependent Claim
40 words
An abrasive tool for grinding a combined workpiece of a steel with an ultrahard alloy as claimed in claim 6, wherein the innermost and the middle layers consists of a nickel deposition, and the outer one, of a copper deposition.
Claim 10
Dependent Claim
40 words
An abrasive tool for grinding a combined workpiece of a steel with an ultrahard alloy as claimed in claim 6, wherein the innermost and the middle layers consist of a nickel deposition, and the outer one, of a cobalt deposition.
Claim 11
Dependent Claim
29 words
An abrasive tool for grinding a combined workpiece of a steel with an ultrahard alloy as claimed in claim 2, wherein the metallic coating is formed by an electroplating.
Claim 12
Dependent Claim
29 words
An abrasive tool for grinding a combined workpiece of steel with an ultrahard alloy as claimed in claim 2, wherein the metallic coating is formed by a chemical plating.
Claim 13
Dependent Claim
30 words
An abrasive tool for grinding a combined workpiece of a steel with an ultrahard alloy as claimed in claim 2, wherein the metallic coating is formed by a vacuum deposition.
Claim 14
Dependent Claim
32 words
An abrasive tool for grinding a combined workpiece of a steel with an ultrahard alloy as claimed in any one of claims 1-12, wherein the resinoid bonding material is a phenolic resin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-13 | 1985-01-12 | 1985-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-13 | 1989-01-12 | 1989-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-13 | 1993-01-12 | 1993-07-14 | $7700.00 | Window Closed / Lapsed |