Patent EP0182990A2 successfully refreshed from Google Patents.
Patent US3564329A successfully refreshed from Google Patents.
US3564329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shielding apparatus of metal plates strap-mounted on cathode ray tube for shielding against external magnetic fields
Assignee: Lanteris Space LLC
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Filing: 1968-10-28
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Granted: 1971-02-16
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Expires: 1988-10-28
Abstract
Abstract Apparatus for shielding cathode ray tubes, particularly color picture tubes, from the effect of the earth''s and other external magnetic fields. The shielding apparatus comprises a series of overlapping steel sheets, pressed together and against the tube structure by resilient fasteners. These sheets and fasteners are secured to a strap which is tightened around the circumference of the cathode ray tube, near the front thereof, and shaped and disposed for securement to the inside of a cabinet enclosing the tube.
Inventors
- 👤 John P Uetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:49
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/867
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
115 words
Apparatus for shielding a cathode ray tube from external magnetic fields, such as that of the earth, comprising: a strap extending around the circumference of the tube near the front thereof; means to interconnect ends of the strap and thereby securely to fasten the strap to said tube around its circumference; a series of overlapping sheets of flexible magnetic material, each marginally held to said strap and extending therefrom to cover back portions of the tube; spring means engaging said sheets and said strap to press the sheets against one another and against the tube; and means providing for rigid securement of said strap, and thereby said tube and shield means, to a supporting structure.
Claim 2
Dependent Claim
115 words
Apparatus for shielding a cathode ray tube from external magnetic fields, such as that of the earth, comprising: a strap extending around the circumference of the tube near the front thereof; means to interconnect ends of the strap and thereby securely to fasten the strap to said tube around its circumference; a series of overlapping sheets of flexible magnetic material, each marginally held to said strap and extending therefrom to cover back portions of the tube; spring means engaging said sheets and said strap to press the sheets against one another and against the tube; and means providing for rigid securement of said strap, and thereby said tube and shield means, to a supporting structure.
Claim 3
Dependent Claim
64 words
Apparatus as described in claim 1 wherein said overlapping sheets have corner structures disposed in quadrilateral arrangement on the back of the tube, and wherein said spring means are extension springs, each extending from one of said corner structures diagonally to a portion of said strap adjacent another corner, said extension springs crossing one another on opposed sides of the back of the tube.
References Cited (Backward Citations)
US3431454A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |