US3824515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screening cage
Assignee: Individual
•
Filing: 1972-05-12
•
Granted: 1974-07-16
•
Expires: 1992-05-12
Abstract
Abstract Electric screening cage comprising multifilarly helically wound wires connected to earth so that the earth-connected ends of each pair of adjacent wires are located at opposite ends of the cage.
Inventors
- 👤 B Holman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:23
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/867; H01F; H01F27/00; H01F27/34; H01F27/36; H01F27/363
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
98 words
A deflection unit for an electron beam device comprising, a line deflection coil and a frame deflection coil mounted on said electron beam means, and at least one device for electric screening which does not disturb magnetic fields and which comprises a hollow cylindrical cage composed mainly of electrically conductive material mounted on said electron beam device, said cage comprising at least two wires helically wound in a multifilar fashion with one end of each wire connected to ground and the ground-connected ends of each pair of adjacent wires being located at opposite ends of the cylindrical cage.
Claim 2
Dependent Claim
98 words
A deflection unit for an electron beam device comprising, a line deflection coil and a frame deflection coil mounted on said electron beam means, and at least one device for electric screening which does not disturb magnetic fields and which comprises a hollow cylindrical cage composed mainly of electrically conductive material mounted on said electron beam device, said cage comprising at least two wires helically wound in a multifilar fashion with one end of each wire connected to ground and the ground-connected ends of each pair of adjacent wires being located at opposite ends of the cylindrical cage.
Claim 3
Dependent Claim
29 words
A deflection unit as claimed in claim 1, wherein said wires of the cage are insulated and are located in compact turns in the plane of the cylindrical wall.
Claim 4
Dependent Claim
44 words
A deflection unit as claimed in claim 1 wherein one of the wire ends to be connected to ground is extended at one end of the cylinder and is passed back to the other end where all ends in common are connected to ground.
Claim 5
Dependent Claim
29 words
A deflection unit as claimed in claim 1 wherein the multifilar wires of the cage are disposed between the line and frame deflection coils on said electron beam device.
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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |