US4353006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
CRT with means for suppressing arcing therein
Assignee: RCA Licensing Corp
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Filing: 1980-05-28
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Granted: 1982-10-05
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Expires: 2000-05-28
Abstract
Abstract A CRT comprising an evacuated envelope having an electrically-insulating neck and a beaded electron-gun mount assembly in the neck. The beads of the assembly are closely spaced from the inner surface of the neck. At least a portion of the surface of each of the beads opposite the neck carries a patch of chromium oxide.
Inventors
- 👤 Horst E. P. Schade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:13
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/484; H01J29/82; H01J2229/00; H01J2229/88; H01J2229/882
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
70 words
A cathode-ray tube comprising an evacuated envelope including an electrically-insulating neck, and an electron-gun mount assembly in said neck, said mount assembly comprising a plurality of electrodes mounted on at least two electrically-insulating support rods, said assembly being closely spaced from the inner surface of said neck, at least a portion of the surface of each of said support rods opposite said neck carrying a patch coating of chromium oxide.
Claim 2
Dependent Claim
70 words
A cathode-ray tube comprising an evacuated envelope including an electrically-insulating neck, and an electron-gun mount assembly in said neck, said mount assembly comprising a plurality of electrodes mounted on at least two electrically-insulating support rods, said assembly being closely spaced from the inner surface of said neck, at least a portion of the surface of each of said support rods opposite said neck carrying a patch coating of chromium oxide.
Claim 3
Dependent Claim
22 words
The cathode-ray tube defined in claim 1 wherein each of said patches consists essentially of chromic oxide Cr 2 O 3 .
Claim 4
Dependent Claim
54 words
The cathode-ray tube defined in claim 1 wherein each of said patches is prepared by a process which consists essentially of applying to said surface a layer of a liquid medium containing a chromium compound, drying said layer to produce said patch, and then heating said patch in air until said patch turns greenish.
Claim 5
Dependent Claim
38 words
The cathode-ray tube defined in claim 3 in which said liquid medium is prepared by dissolving chromium trioxide in water to produce a solution, and reacting a quantity of said solution with methanol to produce said liquid medium.
Claim 6
Dependent Claim
36 words
The cathode-ray tube defined in claim 1 wherein each of said patches is prepared by a process which consists essentially of depositing chromium metal on said surface and then oxidizing said deposited metal to chromium oxide.
Claim 7
Dependent Claim
22 words
The cathode-ray tube defined in claim 1 wherein each of said patches is prepared by depositing chromium oxide directly on said surface.
Claim 8
Dependent Claim
33 words
The cathode-ray tube defined in claim 1 wherein each of said patches is prepared by applying to said surface a thin layer of an organosol of chromium oxide and then curing said layer.
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) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |