US4891491A
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: 1990-01-02
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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
2026-11-07 19:29
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: 4
Claim 1
Independent Claim
78 words
A method of welding adjacent marginal edges of two workpieces to one another by a first laser emitting radiation of a first wavelength comprising the step of reducing the reflectivity of the adjacent marginal edges of each workpiece by directing radiation of a second wavelength from a second laser to the area of the workpiece defining said marginal edge, and subsequently directing radiation from said first laser to said marginal edges to weld said edges to one another.
Claim 2
Independent Claim
78 words
A method of welding adjacent marginal edges of two workpieces to one another by a first laser emitting radiation of a first wavelength comprising the step of reducing the reflectivity of the adjacent marginal edges of each workpiece by directing radiation of a second wavelength from a second laser to the area of the workpiece defining said marginal edge, and subsequently directing radiation from said first laser to said marginal edges to weld said edges to one another.
Claim 3
Dependent Claim
31 words
A method according to claim 1 including the step of cutting said workpiece along the area of reduced reflectivity by a laser of said first wavelength to define said marginal edge.
Claim 4
Dependent Claim
16 words
A method according to claim 1 wherein said first wavelength is longer than said second wavelength.
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) | 1993-01-01 | 1993-07-03 | 1994-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-01 | 1997-07-03 | 1998-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-01 | 2001-07-03 | 2002-01-02 | $7700.00 | Window Closed / Lapsed |