US3826944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube with inorganic phosphor and fiber optic face plate
Assignee: Westinghouse Electric Corp
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Filing: 1970-06-04
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Granted: 1974-07-30
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Expires: 1990-06-04
Abstract
Abstract A high contrast cathode ray tube which incorporates a phosphor material responsive to electronic bombardment and generates ultraviolet radiations in response thereto and in which the ultraviolet phosphor is provided on the inner surface of a fiber optic window. Positioned on the outer surface of the fiber optic faceplate is an ultraviolet transmitting, visible absorbing filter with an organic phosphor emitting visible light in response to ultraviolet excitation and a visible transmitting, ultraviolet absorbing filter provided on the outer surface of the organic phosphor.
Inventors
- 👤 K Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:22
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J29/892; H01J29/02; H01J29/10; H01J29/18; H01J29/24; H01J29/26; H01J31/00; H01J31/08; H01J31/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
The device in claim 1 in which said first filter means is a filter member positioned between said organic phosphor layer and said window.
Claim 2
Dependent Claim
33 words
The device set forth in claim 1 in which said first filter means provided between said organic phosphor and said inorganic phosphor is filter means provided within the light fibers of said window.
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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |