US4938455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid-jet cutting torch
Assignee: Messer Griesheim GmbH
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Filing: 1989-03-13
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Granted: 1990-07-03
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Expires: 2009-03-13
Abstract
Abstract A liquid-jet cutting torch for cutting with liquid oxygen, includes a cutting-oxygen line surrounded all the way to the outlet of the cutting nozzle by a cooling-medium line, by a vacuum insulation and by a cooling-water casing.
Inventors
- 👤 Paul Grohmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:59
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/46; F23D14/48; F23D14/52; F23D14/54; B; B26; B26F; B26F3/00; B26F3/004; B23; B23K; B23K7/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
75 words
In a liquid-jet cutting torch, the improvement being in that a centrally positioned liquid-jet line having a mouthpiece, a cutting nozzle attached to said mouthpiece, an inner pipe concentrically surrounding said line to comprise means to admit and remove a liquefied cooling medium with a low-boiling point, an intermediate pipe concentrically around said inner pipe, said intermediate pipe comprising a vacuum insulation concentrically surrounding said inner pipe, and an outer cooling-water casing surrounding said pipe.
Claim 2
Dependent Claim
75 words
In a liquid-jet cutting torch, the improvement being in that a centrally positioned liquid-jet line having a mouthpiece, a cutting nozzle attached to said mouthpiece, an inner pipe concentrically surrounding said line to comprise means to admit and remove a liquefied cooling medium with a low-boiling point, an intermediate pipe concentrically around said inner pipe, said intermediate pipe comprising a vacuum insulation concentrically surrounding said inner pipe, and an outer cooling-water casing surrounding said pipe.
Claim 3
Dependent Claim
19 words
Liquid-jet cutting torch according to claim 1, characterized in that a cooling head is attached to said cooling-water casing.
Claim 4
Dependent Claim
23 words
Liquid-jet cutting torch according to claim 2, characterized in that said cooling head is equipped with a covering cap with a fire-proof compound.
Claim 5
Dependent Claim
15 words
Liquid-jet cutting torch according to claim 3, characterized in that said cap is conically shaped.
Claim 6
Dependent Claim
24 words
Liquid-jet cutting torch according to claim 3, characterized in that said cutting nozzle is located outside said covering cap together with said fire-proof compound.
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) | 1993-07-02 | 1994-01-01 | 1994-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-02 | 1998-01-01 | 1998-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-02 | 2002-01-01 | 2002-07-03 | $7700.00 | Window Closed / Lapsed |