US4091133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous ceramic tubing for flowing gas lasers
Assignee: United States Department of the Army
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Filing: 1975-12-03
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Granted: 1978-05-23
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Expires: 1995-12-03
Abstract
Abstract Porous ceramic materials are used for the walls of tubing for flowing gas lasers. Analysis of the gas flow shows that the axial pressure variation in the porous wall tubes is more gradual than for dense wall tubes leading to more uniform gain conditions. The saturation intensity is more uniform not only due to the reduced pressure anisotropy but also, at higher flow rates, because of axially varying particle dwell times in the discharge region.
Inventors
- 👤 Aristotle Papayoanou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:38
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/10; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
52 words
In a discharge tube for flowing gas lasers, the improvement of using porous ceramic material as the walls of the tubing, wherein the porous ceramic material has an average pore size of about 2 to 20 microns, and wherein the bore of the tubing is about 1 to 3 millimeters in diameter.
Claim 2
Dependent Claim
52 words
In a discharge tube for flowing gas lasers, the improvement of using porous ceramic material as the walls of the tubing, wherein the porous ceramic material has an average pore size of about 2 to 20 microns, and wherein the bore of the tubing is about 1 to 3 millimeters in diameter.
Claim 3
Dependent Claim
29 words
In a discharge tube according to claim 1, the use of a material selected from the group consisting of porous beryllia and porous alumina as the porous ceramic material.
Claim 4
Dependent Claim
18 words
In a discharge tube according to claim 2, the use of porous beryllia as the porous ceramic material.
Claim 5
Dependent Claim
18 words
In a discharge tube according to claim 2, the use of porous alumina as the porous ceramic material.
Claim 6
Dependent Claim
56 words
In a discharge chamber for a flowing gas channel laser, the improvement of using a porous ceramic material as the side walls of the chamber, wherein the porous ceramic material has an average pore size of about 2 to 20 microns, and wherein the bore of the tubing is about 1 to 3 millimeters in diameter.
Claim 7
Dependent Claim
56 words
In a discharge chamber for a flowing gas channel laser, the improvement of using a porous ceramic material as the side walls of the chamber, wherein the porous ceramic material has an average pore size of about 2 to 20 microns, and wherein the bore of the tubing is about 1 to 3 millimeters in diameter.
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) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |