Patent US3944867A successfully refreshed from Google Patents.
US3944867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shadow mask having ribs bounding rectangular apertures
Assignee: Zenith Electronics LLC
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Filing: 1974-03-15
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Granted: 1976-03-16
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Expires: 1994-03-15
Abstract
Abstract A shadow mask for use in a color cathode ray tube to insure that a given electron beam impinges only on a given portion of the cathode ray tube screen. The mask comprises a webbing or sheet of relatively thin, electrically conductive material which defines a mask plane and which has therein a periodic array of electron transmissive apertures. The sheet includes a periodic array of ribs and/or dimples extending out of the plane of the mask to impart substantial rigidity to the mask.
Inventors
- 👤 Sam H. Kaplan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:08
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/06; H01J29/07
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
94 words
A shadow mask for use in a color cathode ray tube comprising a relatively thin, spherically curved sheet of electrically conductive material which defines a spherical mask plane and which has therein a periodic array of elongated, rectangularly shaped electron transmissive apertures, said periodic array forming a plurality of columns, each of said apertures being bounded on one of the longer sides thereof by a rib out-struck from the sheet and extending from the convex side thereof for imparting rigidity to the mask and for defining, at least in part, the electron transmissive aperture.
Claim 2
Dependent Claim
94 words
A shadow mask for use in a color cathode ray tube comprising a relatively thin, spherically curved sheet of electrically conductive material which defines a spherical mask plane and which has therein a periodic array of elongated, rectangularly shaped electron transmissive apertures, said periodic array forming a plurality of columns, each of said apertures being bounded on one of the longer sides thereof by a rib out-struck from the sheet and extending from the convex side thereof for imparting rigidity to the mask and for defining, at least in part, the electron transmissive aperture.
Claim 3
Dependent Claim
53 words
A shadow mask as defined in claim 1 wherein said apertures and said out-struck ribs are disposed in rows arranged end-to-end, each aperture being separated from its neighbors by tie bars, in alternate rows said apertures and associated ribs being staggered to enhance the mechanical rigidity imparted to the mask by said ribs.
References Cited (Backward Citations)
US2236041A
Cited
US2579665A
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US2942133A
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US3041489A
Cited
US3229142A
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US3663854A
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USB395478I5
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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) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |