US3875452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube with longitudinally seamed body portions
Assignee: Individual
•
Filing: 1973-07-09
•
Granted: 1975-04-01
•
Expires: 1993-07-09
Abstract
Abstract A vacuum tube comprising an envelope and at least one electrode within that envelope, wherein the envelope includes two portions joined together along a seam and the required electrical connection is made to the electrode from outside the envelope by means of at least one conductor which passes through the seam. Preferably, the conductor serves to locate and support the electrode in the tube.
Inventors
- 👤 Vere Krause Anthony Victor De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:03
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/82; H01J29/02; H01J29/48; H01J29/86; H01J29/861; H01J29/92; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J9/00; H01J9/24; H01J9/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
152 words
A cathode ray tube comprising a glass envelope and a plurality of electrodes therein forming an electron gun assembly; said envelope including two body portions joined together along a seam, conductors supporting and positioning the electrodes of said gun assembly within said envelope, said conductors forming electrical connections to the electrodes from exteriorly of the envelope, said conductors passing through the seam, said envelope including a screen cup having a phosphor-coated face of the tube formed therein, and a second seam joining said screen cup to said body portions; said tube including a directly heated cathode filament and a grid electrode including a metal plate with a grid aperture therein, at least one grid conductor wire supporting said grid plate in the envelope and passing through the seam between the body portions, and two filament conductor wires supporting said filament in the envelope and passing through the seam between the body portions.
Claim 2
Dependent Claim
152 words
A cathode ray tube comprising a glass envelope and a plurality of electrodes therein forming an electron gun assembly; said envelope including two body portions joined together along a seam, conductors supporting and positioning the electrodes of said gun assembly within said envelope, said conductors forming electrical connections to the electrodes from exteriorly of the envelope, said conductors passing through the seam, said envelope including a screen cup having a phosphor-coated face of the tube formed therein, and a second seam joining said screen cup to said body portions; said tube including a directly heated cathode filament and a grid electrode including a metal plate with a grid aperture therein, at least one grid conductor wire supporting said grid plate in the envelope and passing through the seam between the body portions, and two filament conductor wires supporting said filament in the envelope and passing through the seam between the body portions.
Claim 3
Dependent Claim
36 words
A cathode ray tube as claimed in claim 1, comprising an insulating member for fastening said grid conductor wire to respectively one of the filament wires so as to form a rigid filament and grid sub-assembly.
Claim 4
Dependent Claim
33 words
A cathode ray tube as claimed in claim 1, comprising a glass frit joining and sealing said envelope body portions together, said glass frit having a lower melting point than said body portions.
Claim 5
Dependent Claim
18 words
A cathode ray tube as claimed in claim 3, said glass frit being constituted of de-vitrifiable glass material.
Claim 6
Dependent Claim
40 words
A cathode ray tube as claimed in claim 1, comprising an adhesive for joining together said envelope body portions, and a glass frit for sealing said body portions, said glass frit having a lower melting point than said body portions.
Claim 7
Dependent Claim
23 words
A cathode ray tube as claimed in claim 1, said body portions and said screen cup each being formed of barium lithium glass.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |