US3679863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal cutting apparatus
Assignee: National Research Development Corp UK
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Filing: 1969-11-10
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Granted: 1972-07-25
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Expires: 1989-11-10
Abstract
Abstract To cut paper, timber, fabric etc., with a laser beam, a jet of air (or other gas which is inert in the process) carrying an atomized stream of a liquid coolant is directed on to the moving region of the workpiece at which the laser beam is concentrated. This reduces the spread of charring or tar deposit from the cut along the surfaces of the workpiece.
Inventors
- 👤 Peter Thomas Houldcroft
- 👤 Arthur Basil Joseph Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:16
CPC Classifications
B; B23; B23K; B23K26/00; B23K26/14; B23K26/146; B23K26/36; B23K26/362; B23K26/364
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
57 words
A method of cutting a combustible workpiece comprising, concentrating a laser beam on a combustible workpiece, moving the beam and workpiece relative to one another to cut the workpiece, and directing a jet of gas carrying an atomized stream of a liquid coolant onto the moving region of the workpiece at which the laser beam is concentrated.
Claim 2
Independent Claim
57 words
A method of cutting a combustible workpiece comprising, concentrating a laser beam on a combustible workpiece, moving the beam and workpiece relative to one another to cut the workpiece, and directing a jet of gas carrying an atomized stream of a liquid coolant onto the moving region of the workpiece at which the laser beam is concentrated.
Claim 3
Dependent Claim
37 words
A method in accordance with claim 1, wherein said directing step comprises, enclosing the path of the laser beam in a tube, introducing said gas into the tube and thereafter introducing the liquid coolant into said gas.
References Cited (Backward Citations)
US2526423A
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US2908799A
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US3388314A
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US3131288A
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US3204076A
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US3424890A
Cited
US3472998A
Cited
US3469076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |