US3721848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera tube having photoconductive lead monoxide layer on silicon carbide signal plate
Assignee: US Philips Corp
•
Filing: 1970-11-18
•
Granted: 1973-03-20
•
Expires: 1990-11-18
Abstract
Abstract In order to ensure satisfactory durability of signal windows for use in electron tubes comprising a transparent substrate covered by a radiation-sensitive layer, the contact surface of the substrate with said layer is rendered electrically conductive with the aid of conductive silicon carbide.
Inventors
- 👤 W Knippenberg
- 👤 G Verspui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:14
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/233; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/24; H01J29/36; H01J29/39; H01J29/45
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
31 words
An electron discharge tube as claimed in claim 1 in which the transparent layer of electrically conductive silicon carbide is provided with a metal contact for making an electrical connection thereto.
References Cited (Backward Citations)
US2544755A
Cited
US2698912A
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US3444412A
Cited
US3310700A
Cited
US3505551A
Cited
US3577285A
Cited
US3600645A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |