US4414038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser beam surface treatment process for materials of large reflectivity
Assignee: Individual
•
Filing: 1982-07-07
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Granted: 1983-11-08
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Expires: 2002-07-07
Abstract
Abstract Directing a laser beam at a surface to be treated, such as a metallic surface which is likely to reflect much of the energy, results in a high proportion of absorbed energy if the laser beam has an oblique incidence, particularly if the laser beam is polarized in a direction parallel to the plane of incidence (defined as the plane which contains the axis of the laser beam and the perpendicular to the surface at the center of the spot of incidence). In the case of iron and steel surfaces the absorbtion is markedly increased at angles of incidence greater than 45° and just short of glancing incidence, with a maximum near 80°.
Inventors
- 👤 Friedrich Dausinger
- 👤 Werner Muller
- 👤 Peter Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:07
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/06; C21D1/09; B; B23; B23K; B23K26/00; B23K26/18; B23K2103/00; B23K2103/02; B23K2103/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
106 words
A process of surface heat treatment of work pieces by means of a laser beam, comprising the steps of: directing said laser beam to impinge on the surface to be treated at an angle of incidence greater than 45°, said angle of incidence being defined as the angle between the axis of said laser beam and the perpendicular to said surface where it is intersected by the center of said laser beam, and polarizing said laser beam linearly in a direction substantially parallel to the plane of incidence of the laser beam, thereby maximizing the portion of the laser beam energy absorbed by the work piece.
Claim 2
Dependent Claim
106 words
A process of surface heat treatment of work pieces by means of a laser beam, comprising the steps of: directing said laser beam to impinge on the surface to be treated at an angle of incidence greater than 45°, said angle of incidence being defined as the angle between the axis of said laser beam and the perpendicular to said surface where it is intersected by the center of said laser beam, and polarizing said laser beam linearly in a direction substantially parallel to the plane of incidence of the laser beam, thereby maximizing the portion of the laser beam energy absorbed by the work piece.
Claim 3
Dependent Claim
16 words
Process as defined in claim 1 in which said angle of incidence is greater than 70°.
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) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |