US5450434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method to work cubic boron nitride article
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1993-05-25
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Granted: 1995-09-12
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Expires: 2013-05-25
Abstract
Abstract The present invention provides a method for cutting or smoothing an article containing cubic boron nitride. In particular, the method comprises the step of irradiating a beam having a wavelength of not longer than 360 nm to the cubic boron nitride article so that the article is cut or smoothed quickly and with high accuracy.
Inventors
- 👤 Nobuhiro Ota
- 👤 Naoji Fujimori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:35
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; B; B23; B23K; B23K26/00; B23K26/36; B23K26/40; C04B41/0036; C04B41/80; B23K2103/00; B23K2103/50; B23K2103/52
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
A method for working an article at least a portion of which is made of boron nitride, said method comprising the step of irradiating a beam to a surface of the article, wherein the beam has a wavelength of not greater than 360 nm, wherein the boron nitride is cubic boron nitride, and wherein the beam is emitted from a pulsed laser and a diverging angle of the beam emitted from a laser oscillator is in a range of 10 -2 mrad (milli-radian) to 5×10 -1 mrad.
Claim 2
Independent Claim
87 words
A method for working an article at least a portion of which is made of boron nitride, said method comprising the step of irradiating a beam to a surface of the article, wherein the beam has a wavelength of not greater than 360 nm, wherein the boron nitride is cubic boron nitride, and wherein the beam is emitted from a pulsed laser and a diverging angle of the beam emitted from a laser oscillator is in a range of 10 -2 mrad (milli-radian) to 5×10 -1 mrad.
Claim 3
Dependent Claim
15 words
The method according to claim 1 wherein the wavelength is not smaller than 190 nm.
Claim 4
Dependent Claim
27 words
The method according to claim 1 wherein an energy density of the beam is in a range of 10 W/cm 2 to 10 11 W/cm 2 .
Claim 5
Dependent Claim
27 words
The method according to claim 1 wherein an energy density per pulse is in a range of 10 -1 J/cm 2 to 10 6 J/cm 2 .
Claim 6
Dependent Claim
32 words
The method according to claim 1 wherein a full width of half maximum of an oscillating spectrum of the laser beam is in a range of 10 -4 nm to 1 nm.
Claim 7
Dependent Claim
26 words
The method according to claim 1 wherein a scattering extent of an energy density across a cross section of the beam is not greater than 10%.
Claim 8
Dependent Claim
23 words
The method according to claim 1 wherein the beam is converged using at least one of a cylindrical lens and a cylindrical mirror.
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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) | 1998-09-11 | 1999-03-13 | 1999-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-11 | 2003-03-13 | 2003-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-11 | 2007-03-13 | 2007-09-12 | $7700.00 | Window Closed / Lapsed |