US3711734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode-ray tube having antenna getter with bimetallic insertion device
Assignee: Hitachi Ltd
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Filing: 1970-05-27
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Granted: 1973-01-16
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Expires: 1990-05-27
Abstract
Abstract In cathode-ray tubes provided with an antenna getter on an electron-gun structure, a cathode-ray tube having antenna getter structures so improved in construction that, when the electrongun structure is advanced for insertion into said cathode-ray tube, there will be eliminated contact between the getter structures and a conductive coating on the inner surface of the tube wall, thereby to protect the conductive coating from coming off or being damaged, whereby deterioration in the innerelectrode insulation due to release of fine particle of the coating into the tube and the consequent in-tube discharge phenomenon may be prevented.
Inventors
- 👤 E Yamazaki
- 👤 H Kanai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:31
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/94
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
20 words
A cathode-ray tube according to claim 1, wherein said bimetallic members are separate members affixed to said elastic strip wires.
Claim 2
Dependent Claim
23 words
A cathode-ray tube according to claim 1, wherein said elastic strip wires are each formed in two parts interconnected by said bimetallic member.
Claim 3
Dependent Claim
195 words
A cathode-ray tube comprising a glass bulb consisting of a panel portion, a funnel portion and a neck portion of substantially smaller diameter than the average diameter of said funnel portion, a phosphor screen disposed on the inner face of said panel portion, a conductive coating applied and formed on the inner walls of said funnel portion and said neck portion, an electron-gun structure disposed inside said neck portion, at least a pair of antenna getters each including a supporting member secured on one extreme end of said electron-gun structure and a getter structure attached to that end of said supporting member remote from the secured end thereof and being normally positioned closely adjacent said inner wall of said funnel portion, said supporting member consisting of a bimetallic member including first and second members of different coefficient of expansion with the member having a higher coefficient of expansion being disposed radially outward from the other member adjacent said glass bulb whereby upon heating of said bimetallic members said antenna getters will be deflected from their normal position toward the tube axis so as to be spaced by less than the diameter of said neck portion.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |