Patent US3700949A successfully refreshed from Google Patents.
US3700949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color television picture tube
Assignee: NEC Corp
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Filing: 1971-01-21
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Granted: 1972-10-24
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Expires: 1991-01-21
Abstract
Abstract A color television picture tube comprises an integrally formed shadow mask unit including electron beam passing apertures, and skirt, and flange portions. The unitary mask construction is secured to a bulb housing via studs, and bimetal is employed for temperature compensation. The structure obviates welding and welding associated nonuniformity and expense, and also permits accurate registration of the mask structure within the tube.
Inventors
- 👤 Takeshi Watanabe
- 👤 Yuzi Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:54
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/06; H01J29/07; H01J29/073; H01J2229/00; H01J2229/07; H01J2229/0727; H01J2229/0766; H01J2229/0772
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
134 words
A color television picture tube comprising a bulb having a front panel including portions for producing a plurality of colors responsive to electron bombardment and formed of a substantially transparent material, said bulb including a peripheral side wall portion adjacent to the edge of said front panel, an aperture mask unit having plural apertures for permitting passage of electron beams therethrough corresponding to said front panel portions for producing a plurality of colors, and means for securely supporting said aperture mask unit wherein said aperture mask unit is formed of a plate integrally comprising an aperture plate portion, a cylindrical aperture plate skirt portion, and a flange portion bent inward nearly perpendicular to the surface of said skirt portion and then bent outward extending toward the inner wall of said peripheral side wall portion.
Claim 2
Dependent Claim
134 words
A color television picture tube comprising a bulb having a front panel including portions for producing a plurality of colors responsive to electron bombardment and formed of a substantially transparent material, said bulb including a peripheral side wall portion adjacent to the edge of said front panel, an aperture mask unit having plural apertures for permitting passage of electron beams therethrough corresponding to said front panel portions for producing a plurality of colors, and means for securely supporting said aperture mask unit wherein said aperture mask unit is formed of a plate integrally comprising an aperture plate portion, a cylindrical aperture plate skirt portion, and a flange portion bent inward nearly perpendicular to the surface of said skirt portion and then bent outward extending toward the inner wall of said peripheral side wall portion.
Claim 3
Dependent Claim
34 words
A color television picture tube as in claim 1, in which a part of said supporting means is inserted into the space formed between the reversely bent flange portion of said aperture mask unit.
Claim 4
Dependent Claim
66 words
A color television picture tube as in claim 2, in which said supporting means comprises an L-shaped stud one end of which is sealed into the inner wall of said peripheral side wall portion, the other end of said stud being engaged with an aperture mask unit support hole bored in the vicinity of the edge portion of said flange portion of said aperture mask unit.
Claim 5
Dependent Claim
20 words
A color television picture tube as in claim 2, in which said support means part comprises a piece of bimetal.
References Cited (Backward Citations)
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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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |