US4905249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic converter
Assignee: Dornier Medizintechnik GmbH
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Filing: 1989-01-06
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Granted: 1990-02-27
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Expires: 2009-01-06
Abstract
Abstract A closed loop carbon dioxide laser system includes a catalytic converter in the form of a conduit with an annular recess which is filled with a catalyst of platinum-plated alumina pellets that are externally heated.
Inventors
- 👤 Robert Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:13
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/036
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
A closed-loop carbon dioxide laser system comprising: a carbon dioxide laser; a heat exchanger; a catalytic converter comprising a conduit means for conducting a gas, a catalysing means, said catalysing means having an annular recess in said conduit means, a plurality of pellets of platinum-plated alumina in said annular recess and porous means for containing said pellets in said annular recess, a heating means, for heating said catalysing means and turbulating means for deflections a portion of the gas towards said catalysing means; and conduit means for interconnection of said laser, said heat exchanger and said catalytic converter in a closed loop.
Claim 2
Dependent Claim
102 words
A closed-loop carbon dioxide laser system comprising: a carbon dioxide laser; a heat exchanger; a catalytic converter comprising a conduit means for conducting a gas, a catalysing means, said catalysing means having an annular recess in said conduit means, a plurality of pellets of platinum-plated alumina in said annular recess and porous means for containing said pellets in said annular recess, a heating means, for heating said catalysing means and turbulating means for deflections a portion of the gas towards said catalysing means; and conduit means for interconnection of said laser, said heat exchanger and said catalytic converter in a closed loop.
Claim 3
Dependent Claim
44 words
The catalytic converter of claim 1 wherein: said catalysing means is annularly disposed about the inner wall of said conduit means and extends along a portion of the length of said conduit means so that the pressure drop in said conduit means is small.
Claim 4
Dependent Claim
27 words
The catalytic converter of claim 1 wherein said turbulating means comprises a portion of said catalysing means extending inwardly from said inner wall of said conduit means.
Claim 5
Dependent Claim
20 words
The catalytic converter of claim 1 wherein said heating means is an electrical heater annularly disposed about said catalysing means.
Claim 6
Independent Claim
65 words
The method of converting a mixture of carbon monoxide and oxygen to carbon dioxide in a carbon dioxide laser system comprising: the steps providing a conduit having one end for receiving the mixture and another end for delivering at least carbon dioxide; providing in said conduit a plurality of platinum-coated alumina pellets annularly disposed about the inner wall of said conduit; and heating said pellets.
Claim 7
Independent Claim
65 words
The method of converting a mixture of carbon monoxide and oxygen to carbon dioxide in a carbon dioxide laser system comprising: the steps providing a conduit having one end for receiving the mixture and another end for delivering at least carbon dioxide; providing in said conduit a plurality of platinum-coated alumina pellets annularly disposed about the inner wall of said conduit; and heating said pellets.
Claim 8
Dependent Claim
16 words
The method of claim 5 further comprising the step of turbulating the mixture in said conduit.
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) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |