US6151786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic blade
Assignee: Sternplastic Hellstern GmbH and Co KG
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Filing: 1997-05-07
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Granted: 2000-11-28
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Expires: 2017-05-07
Abstract
Abstract Ceramic blade (1) of a cutting tool, in particular a knife, with a cutting edge (10) and a rounded off upper edge (12) running opposite to the cutting edge (10). The rounded off upper edge (12) makes possible, in comparison to the conventional sharp-edged transitions, a substantial increase in the break resistance in the case of bending forces.
Inventors
- 👤 Peter Hellstern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:02
CPC Classifications
B; B26; B26B; B26B9/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
60 words
A ceramic blade having a cutting edge (1), two side surfaces, and an upper edge, the cutting edge (1) transitioning to the two side surfaces, the two side surfaces transitioning to the upper edge, and the upper edge running opposite to the cutting edge, wherein the upper edge (12) is rounded off with respect to the side surfaces (14, 16).
Claim 2
Dependent Claim
60 words
A ceramic blade having a cutting edge (1), two side surfaces, and an upper edge, the cutting edge (1) transitioning to the two side surfaces, the two side surfaces transitioning to the upper edge, and the upper edge running opposite to the cutting edge, wherein the upper edge (12) is rounded off with respect to the side surfaces (14, 16).
Claim 3
Dependent Claim
15 words
The blade according to cliam 1, wherein said blade forms part of a cutting tool.
Claim 4
Dependent Claim
15 words
The blade according to cliam 1, wherein said blade forms part of a cutting tool.
Claim 5
Dependent Claim
13 words
The blade as in claim 2, wherein said cutting tool is a knife.
Claim 6
Dependent Claim
23 words
The blade according to claim 1, wherein said upper edge (12) transitions to both side surfaces with a curve (18) forming a radius.
Claim 7
Dependent Claim
14 words
The blade according to claim 4, wherein said radius is larger than 0.3 mm.
Claim 8
Dependent Claim
14 words
The blade according to claim 4, wherein said radius is greater than 0.5 mm.
Claim 9
Dependent Claim
23 words
The blade according to claim 1, wherein said upper edge (12) in cross-section is in the form of a half ellipse (B; D).
Claim 10
Dependent Claim
21 words
The blade according to claim 1, wherein said upper edge (12) in cross-section is in the form of a semi-circle (C).
Claim 11
Dependent Claim
16 words
The blade according to claim 1, wherein said blade is produced by an injection molding process.
Claim 12
Dependent Claim
20 words
The blade according to claim 1, wherein said blade is made of ceramic and said ceramic is a ceramic oxide.
Claim 13
Dependent Claim
19 words
The blade according to claim 10, wherein said ceramic oxide is aluminum oxide, zirconium oxide or a mixture thereof.
Claim 14
Independent Claim
72 words
A method for enhancing the break strength of a ceramic blade having a cutting edge (1), two side surfaces, and an upper edge, the cutting edge (1) transitioning to the two side surfaces, the two side surfaces transitioning to the upper edge, and the upper edge running opposite to the cutting edge, the method comprising rounding off the area of transition between the upper edge (12) and the side surfaces (14, 16).
Claim 15
Independent Claim
72 words
A method for enhancing the break strength of a ceramic blade having a cutting edge (1), two side surfaces, and an upper edge, the cutting edge (1) transitioning to the two side surfaces, the two side surfaces transitioning to the upper edge, and the upper edge running opposite to the cutting edge, the method comprising rounding off the area of transition between the upper edge (12) and the side surfaces (14, 16).
Claim 16
Dependent Claim
23 words
A method according to claim 12, wherein said upper edge (12) transitions to both side surfaces with a curve (18) forming a radius.
Claim 17
Dependent Claim
14 words
A method according to claim 13, wherein said radius is larger than 0.3 mm.
Claim 18
Dependent Claim
14 words
A method according to claim 13, wherein said radius is greater than 0.5 mm.
Claim 19
Dependent Claim
23 words
A method according to claim 12, wherein said upper edge (12) in cross-section is in the form of a half ellipse (B; D).
References Cited (Backward Citations)
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Cited
US2566112A
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US3035344A
Cited
US3252219A
Cited
US3543402A
Cited
US5077901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-11-28 | 2004-05-29 | 2004-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-11-28 | 2008-05-29 | 2008-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-11-28 | 2012-05-29 | 2012-11-28 | $7700.00 | Window Closed / Lapsed |