Patent US3792372A successfully refreshed from Google Patents.
US3792372A
Expired / Lapsed
US
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Means for ensuring starting of gas laser
Assignee: RCA Corp
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Filing: 1972-06-12
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Granted: 1974-02-12
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Expires: 1992-06-12
Abstract
Abstract By employing a serially-connected, resistance of 20 to 500 megohms between an additional starting electrode and the anode of a gas laser tube, the starting of a discharge between the anode and cold cathode thereof is ensured without the danger of tubedestroying parasitic oscillations.
Inventors
- 👤 J Mark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:07
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/038; H01S3/032; H01S3/0323; H01S3/09; H01S3/097; H01S3/0977
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
179 words
In a gas laser comprising a sealed gas-filled tube including a bore member defining a longitudinal bore and anode and cold cathode electrodes located in cooperative relationship with said bore member for establishing a discharge of a given strength therebetween which extends through the length of said bore in response to both an initial breakdown of said gas and the application of a voltage of a given magnitude across said electrodes, lasing by said tube requiring that said discharge occurs, said given magnitude of said voltage being insufficient in and as of itself of ensure that initial breakdown of said gas will always take place; the improvement therewith of means for ensuring that said initial breakdown of said gas alway takes place comprising a resistance having a value between twenty and five hundred megohms, an additional electrode situated in cooperative relationship with a region of said tube which region is spatially displaced and electrically separated from said anode and cold cathode electrodes, and means for electrically serially connecting said additional electrode to said anode electrode directly through said resistance.
Claim 2
Dependent Claim
179 words
In a gas laser comprising a sealed gas-filled tube including a bore member defining a longitudinal bore and anode and cold cathode electrodes located in cooperative relationship with said bore member for establishing a discharge of a given strength therebetween which extends through the length of said bore in response to both an initial breakdown of said gas and the application of a voltage of a given magnitude across said electrodes, lasing by said tube requiring that said discharge occurs, said given magnitude of said voltage being insufficient in and as of itself of ensure that initial breakdown of said gas will always take place; the improvement therewith of means for ensuring that said initial breakdown of said gas alway takes place comprising a resistance having a value between twenty and five hundred megohms, an additional electrode situated in cooperative relationship with a region of said tube which region is spatially displaced and electrically separated from said anode and cold cathode electrodes, and means for electrically serially connecting said additional electrode to said anode electrode directly through said resistance.
Claim 3
Dependent Claim
103 words
The gas laser defined in claim 1, wherein said anode electrode is situated at a first linear position towards one end of said bore member, wherein said additional electrode is conductive loop surrounding said bore member and situated at a second linear position towards the end thereof opposite to Said one end, whereby the portion of said bore is cooperative relationship with said conductive loop is said region of said tube, and wherein said cold cathode electrode is a cylinder coaxial with and surrounding said bore member and said cold cathode has its entire length situated intermediate said first and second linear positions.
Claim 4
Dependent Claim
67 words
The gas laser defined in claim 1, wherein said additional electrode is an auxiliary anode within said tube situated with respect to said cold cathode electrode to define a gas-filled region extending therebetween which has a ratio of length to cross section which is low relative to the ratio of length to cross section of said bore between said cold cathode electrode and said first mentioned electrode.
Claim 5
Dependent Claim
16 words
The gas laser defined in claim 1, further including a power supply for applying said voltage.
Claim 6
Dependent Claim
21 words
The gas laser defined in claim 1, wherein the value of said resistance is between one hundred and two hundred megohms.
References Cited (Backward Citations)
US2636145A
Cited
US3662284A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |