US3845442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic degaussing device
Assignee: Nichicon Corp
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Filing: 1973-03-13
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Granted: 1974-10-29
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Expires: 1993-03-13
Abstract
Abstract Degaussing apparatus for cathode ray tubes such as television picture tubes and the like utilizing positive temperature coefficient thermisters to control the current through a degaussing coil and means for heating the thermister to reduce the residual degaussing current to a relatively low value.
Inventors
- 👤 O Ihaya
- 👤 M Ito
- 👤 T Hayashi
- 👤 S Fujimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:31
CPC Classifications
H; H01; H01F; H01F13/00; H01F13/006; H01C; H01C1/00; H01C1/14; H01C1/1406; H01J; H01J29/00; H01J29/003; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/29; H01J2229/00; H01J2229/0007; H01J2229/0046; H01J2229/0053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A thermister having positive temperature characteristics comprising at least one piece of resistive material having a positive temperature characteristic and a plurality of electrodes secured to said material to provide a current control portion and a heat generating portion, said resistive material having a pair of opposing surfaces with a layer of conductive material on one surface and at least two conductive layers on the other surface, the last said layers being spaced one from the other, and said electrodes being secured to said layers, one of said two conductive layers on said other surface at least partially surrounding the other of the last said layers.
Claim 2
Dependent Claim
106 words
A thermister having positive temperature characteristics comprising at least one piece of resistive material having a positive temperature characteristic and a plurality of electrodes secured to said material to provide a current control portion and a heat generating portion, said resistive material having a pair of opposing surfaces with a layer of conductive material on one surface and at least two conductive layers on the other surface, the last said layers being spaced one from the other, and said electrodes being secured to said layers, one of said two conductive layers on said other surface at least partially surrounding the other of the last said layers.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |