Patent US4343909A successfully refreshed from Google Patents.
US4343909A
Expired / Lapsed
US
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High toughness ceramic cutting tool
Assignee: Valenite LLC
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Filing: 1981-05-01
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Granted: 1982-08-10
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Expires: 2001-05-01
Abstract
Abstract Extremely tough, strong and wear resistant cold pressed and sintered inserts consisting essentially of from about 4 to 20% zirconia, from about 1-15% titanium diboride, and up to about 10% grain growth inhibiting sintering aid with the balance being alumina.
Inventors
- 👤 James H. Adams
- 👤 Dennis J. Rich
- 👤 Frederick C. Holtz, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:29
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/117; C04B35/119
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
43 words
An insert for a cutting tool consisting essentially of: from about 1 to about 15% zirconia; up to about 2% magnesia; from about 5% to about 20% titanium diboride; up to about 10% titanium dioxide; and from about 60% to about 94% alumina.
Claim 2
Dependent Claim
43 words
An insert for a cutting tool consisting essentially of: from about 1 to about 15% zirconia; up to about 2% magnesia; from about 5% to about 20% titanium diboride; up to about 10% titanium dioxide; and from about 60% to about 94% alumina.
Claim 3
Dependent Claim
18 words
The insert of claim 1, wherein said insert is formed by the process of cold pressing and sintering.
Claim 4
Dependent Claim
32 words
An insert for a cutting tool consisting essentially of: from about 4 to about 12% zirconia; from about 5 to about 20% titanium diboride; and from about 68% to about 91% alumina.
Claim 5
Dependent Claim
32 words
An insert for a cutting tool consisting essentially of: from about 4 to about 12% zirconia; from about 5 to about 20% titanium diboride; and from about 68% to about 91% alumina.
Claim 6
Dependent Claim
18 words
The insert of claim 3, wherein said insert is formed by the process of cold pressing and sintering.
Claim 7
Dependent Claim
41 words
An insert for a cutting tool consisting essentially of: from about 4 to about 20% zirconia; from about 0.5% to about 15% titanium diboride; up to about 10% grain growth inhibiting sintering aid; and from about 60% to about 95% alumina.
Claim 8
Dependent Claim
41 words
An insert for a cutting tool consisting essentially of: from about 4 to about 20% zirconia; from about 0.5% to about 15% titanium diboride; up to about 10% grain growth inhibiting sintering aid; and from about 60% to about 95% alumina.
Claim 9
Dependent Claim
49 words
An insert according to claim 5, wherein the amount of zirconia is between about 6 and about 15%, the amount of titanium diboride is between about 1 and about 15% and the grain growth inhibiting sinerting aid contains up to about 2% titania and up to about 0.5% magnesia.
Claim 10
Dependent Claim
19 words
An insert according to claim 6 wherein the amount of titanium diboride is between about 1% and about 12%.
Claim 11
Dependent Claim
31 words
An insert according to claim 5 wherein the amount of zirconia is between about 6% and about 15%, and the amount of titanium diboride is between about 2 and about 12%.
Claim 12
Dependent Claim
38 words
An insert for a cutting tool consisting essentially of: from about 2 to about 15% zirconia; up to about 10% sintering aid; from about 6% to about 20% titanium diboride; and from about 65% to about 94% alumina.
Claim 13
Dependent Claim
38 words
An insert for a cutting tool consisting essentially of: from about 2 to about 15% zirconia; up to about 10% sintering aid; from about 6% to about 20% titanium diboride; and from about 65% to about 94% alumina.
Claim 14
Dependent Claim
30 words
An insert according to claim 9 wherein the amount of zirconia is between about 3 and 12% and the amount of titanium diboride is between about 6 and about 15%.
Claim 15
Dependent Claim
25 words
An insert according to claim 9 wherein the grain growth inhibiting sintering aid includes up to about 10% titania and up to about 2% magnesia.
Claim 16
Dependent Claim
41 words
An insert for a cutting tool consisting essentially of: from about 2 to about 4% titanium diboride; from about 6 to about 12% zirconia; up to about 2% grain growth inhibiting sintering aid; and from about 85 to about 90% alumina.
Claim 17
Dependent Claim
41 words
An insert for a cutting tool consisting essentially of: from about 2 to about 4% titanium diboride; from about 6 to about 12% zirconia; up to about 2% grain growth inhibiting sintering aid; and from about 85 to about 90% alumina.
Claim 18
Dependent Claim
27 words
An insert according to claim 12 wherein said grain growth inhibiting sintering aid consists essentially of up to about 1.5% titania and up to about 0.5% magnesia.
Claim 19
Dependent Claim
28 words
An insert according to claim 13 wherein the amount of titania is between about 0.3 and 0.9% and the amount of magnesia is between about 0.01 and 0.5%.
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) | 1985-08-09 | 1986-02-08 | 1986-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-09 | 1990-02-08 | 1990-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-09 | 1994-02-08 | 1994-08-10 | $7700.00 | Window Closed / Lapsed |