US4368080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing rust from metallic objects
Assignee: Individual
•
Filing: 1980-10-27
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Granted: 1983-01-11
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Expires: 2000-10-27
Abstract
Abstract Rust is removed from the surfaces of metallic objects by focusing a laser beam on successive increments of the surface so that the beam causes evaporation of rust. The laser is a gas laser and is designed to effect pulsed emission of coherent radiation. The output power of the laser is selected in such a way that the beam cannot melt or evaporate the parent metal.
Inventors
- 👤 Robert Langen
- 👤 Rasmus Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:36
CPC Classifications
B; B23; B23K; B23K26/00; B23K26/14; B23K26/1462; B23K26/1464; B23K26/1476; B08; B08B; B08B7/00; B08B7/0035; B08B7/0042; B23K26/02; B23K26/06; B23K26/062; B23K26/0622; B23K26/12; B23K26/123; B23K26/127; B23K26/128; B23K26/142
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
46 words
A method of removing rust from the surface of an object consisting of oxidizable metal, comprising the step of focusing a laser beam upon the rust to heat the rust to evaporation temperature and to thereby effect evaporation of rust from the surface of said object.
Claim 2
Independent Claim
46 words
A method of removing rust from the surface of an object consisting of oxidizable metal, comprising the step of focusing a laser beam upon the rust to heat the rust to evaporation temperature and to thereby effect evaporation of rust from the surface of said object.
Claim 3
Dependent Claim
14 words
The method of claim 1, further comprising the step of pulsing the laser beam.
Claim 4
Dependent Claim
17 words
The method of claim 2, wherein the duration of each pulse is between 1 and 100 μs.
Claim 5
Dependent Claim
21 words
The method of claim 2, wherein the power output of the laser beam is between 1 and 5 ws per pulse.
Claim 6
Dependent Claim
34 words
The method of claim 1, wherein said focusing step includes focusing the laser beam upon a spot of the surface of said object having an area of between 0.3 and 2 cm 2 .
Claim 7
Dependent Claim
23 words
The method of claim 1, further comprising the step of pulsing the laser beam at a frequency of between 1 and 1000 hertz.
Claim 8
Dependent Claim
14 words
The method of claim 6, wherein said frequency is between 100 and 500 hertz.
Claim 9
Dependent Claim
29 words
The method of claim 1, further comprising the step of establishing a protective atmosphere in the region of impingement of the laser beam upon the surface of said object.
Claim 10
Dependent Claim
12 words
The method of claim 8, wherein said atmosphere is a reducing atmosphere.
Claim 11
Dependent Claim
35 words
The method of claim 1, further comprising the step of effecting relative movement between the laser beam and said object so that the beam is focused upon successive portions of the surface of said object.
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) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |