Patent US2366954A successfully refreshed from Google Patents.
US4344905A
Expired / Lapsed
US
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Gas lasers
Assignee: LASER ECOSSE Ltd
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Filing: 1979-11-02
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Granted: 1982-08-17
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Expires: 1999-11-02
Abstract
Abstract A cathode electrode for a gas discharge laser comprises a block of platinum black compressed into a solid mass.
Inventors
- 👤 Arthur L. Chilcot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:42
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/038; H01S3/0388; H01S3/0382
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
32 words
A method comprising forming a cathode electrode for a gas discharge laser by compressing a quantity of platinum black powder under high pressure to form a solid pellet of electrically conducting material.
Claim 2
Independent Claim
32 words
A method comprising forming a cathode electrode for a gas discharge laser by compressing a quantity of platinum black powder under high pressure to form a solid pellet of electrically conducting material.
Claim 3
Dependent Claim
21 words
A method as claimed in claim 1 in which the pressure is of the order of 50 tons per square inch.
Claim 4
Dependent Claim
34 words
A method as claimed in claim 2 in which the platinum black powder is heated in an atmosphere of hychogen at a temperature in the range 700° C. to 900° C. prior to compression.
Claim 5
Dependent Claim
52 words
A method as claimed in claim 3 in which the material contains a proportion of a metallic oxide, the method including the additional step of heating the compressed mass of material in an atmosphere of oxygen at a temperature and for a time sufficient to convert any exposed metal into its oxide.
References Cited (Backward Citations)
US2145690A
Cited
US2539298A
Cited
US2752665A
Cited
US3085876A
Cited
US3175904A
Cited
US3166417A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-16 | 1986-02-15 | 1986-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-16 | 1990-02-15 | 1990-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-16 | 1994-02-15 | 1994-08-17 | $7700.00 | Window Closed / Lapsed |