Patent US3878490A successfully refreshed from Google Patents.
US3878490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct-wound, precision deflection yoke with adhesive coated core
Assignee: RCA Licensing Corp
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Filing: 1974-09-03
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Granted: 1975-04-15
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Expires: 1994-09-03
Abstract
Abstract In direct-wound yokes, such as toroids, where individual wires are wound from end-cap to opposite end-cap along the core inner surface, the problem of layers of wire wound above and between adjacent wires forcing these wires out of place in a random manner is overcome by coating the inner surface of the core with an adhesive that increases friction and thus resists wire movement. The adhesive, applied in liquid form, remains tacky indefinitely, thus allowing turns to be removed and the parts reused if desired.
Inventors
- 👤 James H Logan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:01
CPC Classifications
H; H01; H01F; H01F5/00; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/72; H01J29/76; H01J29/764; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
A direct-wound, precision deflection yoke for a cathode ray tube, comprising: a magnetic core of flared configuration adapted to fit about a portion of a cathode ray tube; a coating of pressure-sensitive adhesive on the inner surface of said core; a first layer of coil turn segments wound atop said coating of adhesive such that said turn segments are restrained against sideward movement; and a second layer of coil turn segments wound over said first layer of coil turn segments, each turn segment of said second layer being located above and beariNg against a pair of adjacent turn segments of said first layer at least over a portion of the length of said core.
Claim 2
Dependent Claim
114 words
A direct-wound, precision deflection yoke for a cathode ray tube, comprising: a magnetic core of flared configuration adapted to fit about a portion of a cathode ray tube; a coating of pressure-sensitive adhesive on the inner surface of said core; a first layer of coil turn segments wound atop said coating of adhesive such that said turn segments are restrained against sideward movement; and a second layer of coil turn segments wound over said first layer of coil turn segments, each turn segment of said second layer being located above and beariNg against a pair of adjacent turn segments of said first layer at least over a portion of the length of said core.
Claim 3
Dependent Claim
43 words
The apparatus of claim 1 wherein said core includes a slotted end-cap at front and rear ends thereof, said first layer of coil turn segments extending from slots in one of said end-caps to corresponding slots in the other of said end-caps, respectively.
Claim 4
Dependent Claim
49 words
The apparatus of claim 2 wherein each said turn segment of said second layer extends from a respective slot in the end-cap at the front of said core and is spaced apart from said pair of adjacent turn segments of said first layer at the front of said core.
Claim 5
Dependent Claim
26 words
The apparatus of claim 1 wherein each turn segment of said second layer contacts said pressure-sensitive adhesive over another portion of the length of said core.
Claim 6
Dependent Claim
26 words
The apparatus of claim 3 wherein each turn segment of said second layer contacts said pressure-sensitive adhesive over another portion of the length of said core.
Claim 7
Dependent Claim
32 words
The apparatus of claim 1 wherein thickness of said coating of pressure-sensitive adhesive is a fraction of the radius of wire employed in said first and second layers of coil turn segments.
Claim 8
Independent Claim
85 words
A method of fabricating a toroidal magnetic deflection yoke for a cathode ray tube comprising: coating the inner surface of a flared magnetic core with pressure-sensitive adhesive; winding a first layer of coil turns about said core directly on said adhesive coating; and winding a second layer of coil turns about said core such that each turn segment of said second layer bears against a pair of adjacent turn segments of said first layer at least over a portion of the length of said core.
Claim 9
Independent Claim
85 words
A method of fabricating a toroidal magnetic deflection yoke for a cathode ray tube comprising: coating the inner surface of a flared magnetic core with pressure-sensitive adhesive; winding a first layer of coil turns about said core directly on said adhesive coating; and winding a second layer of coil turns about said core such that each turn segment of said second layer bears against a pair of adjacent turn segments of said first layer at least over a portion of the length of said core.
Claim 10
Dependent Claim
28 words
The method of claim 7 wherein each turn segment of said second layer makes contact with said pressure-sensitive adhesive over another portion of the length of said core.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |