US4345185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube apparatus
Assignee: Sony Corp
•
Filing: 1980-06-10
•
Granted: 1982-08-17
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Expires: 2000-06-10
Abstract
Abstract A cathode ray tube apparatus in which a discharge current suppressing means is inserted into the discharge current flowing path between the final electrode of the electron gun of a cathode ray tube and the stem pin thereof within the cathode ray tube.
Inventors
- 👤 Yuzuru Kobori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:37
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/96
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
A cathode ray tube having an electron gun with at least two high voltage electrodes (G3 and G5), a low voltage supply lead, a low voltage electrode (G4) mounted between said high voltage electrodes, a first discharge current suppressing resistor connected between said two high voltage electrodes (G3 and G5) and a second discharge current suppressing resistor connected between said low voltage electrode and said low voltage supply lead.
Claim 2
Dependent Claim
69 words
A cathode ray tube having an electron gun with at least two high voltage electrodes (G3 and G5), a low voltage supply lead, a low voltage electrode (G4) mounted between said high voltage electrodes, a first discharge current suppressing resistor connected between said two high voltage electrodes (G3 and G5) and a second discharge current suppressing resistor connected between said low voltage electrode and said low voltage supply lead.
Claim 3
Dependent Claim
20 words
The cathode ray tube as claimed in claim 1, wherein said gun is a uni-potential type gun having electrodes G1-G5.
Claim 4
Dependent Claim
19 words
A cathode ray tube according to claim 1 wherein said first and second discharge current resistors are ceramic resistors.
Claim 5
Dependent Claim
42 words
A cathode ray tube having an electron gun of the bi-potential type having first, second, third and fourth aligned electrodes, a third electrode supply lead, and a discharge current suppressing resistor connected between said third electrode supply lead and said third electrode.
Claim 6
Dependent Claim
42 words
A cathode ray tube having an electron gun of the bi-potential type having first, second, third and fourth aligned electrodes, a third electrode supply lead, and a discharge current suppressing resistor connected between said third electrode supply lead and said third electrode.
Claim 7
Dependent Claim
18 words
The cathode ray tube as claimed in claim 4, wherein said current suppressing resistor is a ceramic resistor.
References Cited (Backward Citations)
US4255689A
Cited
US4243911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-16 | 1986-02-15 | 1986-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-16 | 1990-02-15 | 1990-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-16 | 1994-02-15 | 1994-08-17 | $7700.00 | Window Closed / Lapsed |