US4879449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means of enhancing laser processing efficiency of metals
Assignee: ArcelorMittal Tailored Blanks Americas Ltd
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Filing: 1988-05-12
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Granted: 1989-11-07
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Expires: 2008-05-12
Abstract
Abstract A method is described of enhancing the efficiency of laser processing of metals by preprocessing with another laser so as to define a track of reduced reflectivity.
Inventors
- 👤 Walter W. Duley
- 👤 Grant Kinsman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:29
CPC Classifications
B; B23; B23Q; B23Q35/00; B23Q35/04; B23Q35/08; B23Q35/12; B23Q35/127; B23Q35/128; B23K; B23K26/00; B23K26/60
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A work piece having a surface exhibiting a high reflectivity to laser radiation of a first wavelength and having formed thereon by a laser of a second wavelength a pattern of reduced reflectivity relative to the reflectivity of the first laser to enhance coupling between said surface and laser radiation of said first wavelength, said pattern exhibiting an increased surface roughness relative to said surface formed by evaporation and melting of said surface by said laser of said second wavelength.
Claim 2
Dependent Claim
80 words
A work piece having a surface exhibiting a high reflectivity to laser radiation of a first wavelength and having formed thereon by a laser of a second wavelength a pattern of reduced reflectivity relative to the reflectivity of the first laser to enhance coupling between said surface and laser radiation of said first wavelength, said pattern exhibiting an increased surface roughness relative to said surface formed by evaporation and melting of said surface by said laser of said second wavelength.
Claim 3
Dependent Claim
13 words
A workpiece according to claim 1 wherein said pattern is an elongate track.
Claim 4
Dependent Claim
18 words
A workpiece according to claim 1 wherein said pattern is defined by a physical alteration of said surface.
Claim 5
Dependent Claim
18 words
A workpiece according to claim 1 wherein said pattern is defined by a chemical change to said surface.
Claim 6
Dependent Claim
21 words
A workpiece according to claim 4 wherein said pattern is defined by a physical alteration as well as said chemical change.
Claim 7
Dependent Claim
19 words
A workpiece according to claim 2 wherein said track extends between spaced locations on the periphery of said workpiece.
Claim 8
Dependent Claim
17 words
A workpiece according to claim 6 wherein said spaced locations are on opposite edges of said workpiece.
Claim 9
Dependent Claim
17 words
A workpiece according to claim 2 wherein said track is located on an edge of said workpiece.
Claim 10
Dependent Claim
23 words
A workpiece according to claim 1 wherein said pattern is formed by overlapping pulses of radiation from said laser of said second wavelength.
References Cited (Backward Citations)
US3569660A
Cited
US3932726A
Cited
US3935419A
Cited
GB2045669A
Cited
US4535218A
Cited
US4670639A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |