Patent US3789320A successfully refreshed from Google Patents.
US3789320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas laser circulation system
Assignee: Ferranti International PLC
•
Filing: 1972-06-19
•
Granted: 1974-01-29
•
Expires: 1992-06-19
Abstract
Abstract A gas circulation system for a laser comprises a reaction vessel comprising an empty tube which may be heated to an appropriate temperature, and means for circulating the gas from the laser through the reaction vessel so that the dissociation of the gas which occurs in use is reversed.
Inventors
- 👤 W Hepburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:57
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/09; H01S3/02; H01S3/03; H01S3/036
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
A gas laser which includes a discharge tube containing a mixture of gases, means for exciting the gas mixture to cause laser action and dissociation of the gas in the discharge tube, and a closed-circuit gas circulation system comprising a reaction vessel, means for circulating the gas mixture through the reaction vessel, means for maintaining the gas mixture in the reaction vessel at a pressure greater than that in the discharge tube, and means for maintaining the reaction vessel at a temperature at which at least some of the dissociation of the gas occurring in the discharge tube is reversed.
Claim 2
Dependent Claim
100 words
A gas laser which includes a discharge tube containing a mixture of gases, means for exciting the gas mixture to cause laser action and dissociation of the gas in the discharge tube, and a closed-circuit gas circulation system comprising a reaction vessel, means for circulating the gas mixture through the reaction vessel, means for maintaining the gas mixture in the reaction vessel at a pressure greater than that in the discharge tube, and means for maintaining the reaction vessel at a temperature at which at least some of the dissociation of the gas occurring in the discharge tube is reversed.
Claim 3
Dependent Claim
38 words
A gas circulation system as claimed in claim 1 in which the gas in that part of the circulation system which includes the reaction vessel is maintained, in operation, at a pressure at least equal to atmospheric pressure.
Claim 4
Dependent Claim
27 words
A laser as claimed in claim 1 in which the reaction vessel is made from a material selected from the group consisting of alumina, silica and mullite.
Claim 5
Dependent Claim
24 words
A laser as claimed in claim 1 in which the reaction vessel is maintained, in operation, at a temperature of the order of 700*C.
Claim 6
Dependent Claim
20 words
A laser as claimed in claim 1 which includes means for replenishing any of the constituents of the gas mixture.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |