US3868593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow-cathode laser tube
Assignee: NEC Corp
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Filing: 1973-10-12
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Granted: 1975-02-25
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Expires: 1993-10-12
Abstract
Abstract A hollow-cathode metal vapor laser tube is disclosed in which a hollow cathode is composed of a plurality of tubular cathode members aligned along a common axis and axially spaced from one another. The anode is composed of a plurality of tubular anode members interposed between adjacent cathode members and surrounding the cathode members. The several cathode member anode member combinations are electrically insulated to permit the separate application of excitation power thereto.
Inventors
- 👤 Shuichi Fukuda
- 👤 Masao Miya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:31
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/031
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
A hollow-cathode metal vapor laser tube comprising a hollow cathode including a plurality of tubular cathode members aligned along a common central axis and axially spaced from one another by a predetermined interval, an anode including a plurality of tubular anode members interposed between adjacent ones of said cathode members and surrounding said cathode members with their axes aligned with said common axis, and means for electrically insulating each of said cathode member-anode member combinations from the neighboring cathode member- anode member combinations, thereby to permit the separate application of excitation power thereto.
Claim 2
Dependent Claim
93 words
A hollow-cathode metal vapor laser tube comprising a hollow cathode including a plurality of tubular cathode members aligned along a common central axis and axially spaced from one another by a predetermined interval, an anode including a plurality of tubular anode members interposed between adjacent ones of said cathode members and surrounding said cathode members with their axes aligned with said common axis, and means for electrically insulating each of said cathode member-anode member combinations from the neighboring cathode member- anode member combinations, thereby to permit the separate application of excitation power thereto.
Claim 3
Dependent Claim
42 words
The laser tube as claimed in claim 1, wherein each of said cathode member - anode member combinations comprises a flange-like insulator member having an apertured disc portion and a cylindrical portion perpendicularly extending from a circular aperture of said disc portion.
Claim 4
Dependent Claim
104 words
The laser tube as claimed in claim 2, wherein the inner diameter of said cylindrical portion is substantially equal to the outer diameter of said cathode member so as to permit said cathode member to be hermetically sealed thereto and to be held coaxially therewith, said anode member being hermetically sealed to the peripheral region of said disc portion of said insulator means with its axis aligned with said cathode member, wherein said cathode member - anode member combinations are stacked with their axes aligned with each other, said cathode members within said cylindrical portions being spaced mutually axially apart by said predetermined spacing.
Claim 5
Dependent Claim
24 words
The laser tube as claimed in claim 3, further comprising external excitation power supply means separately connected to said cathode members and anode members.
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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |