Patent JPS4940432A successfully refreshed from Google Patents.
US4040707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube base
Assignee: GTE Sylvania Inc
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Filing: 1976-07-02
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Granted: 1977-08-09
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Expires: 1996-07-02
Abstract
Abstract A base for a cathode ray tube includes at least one tube pin isolating means formed within the rim of the base to provide arc prevention between adjacent tube pins which can have up to a 12 KV potential difference therebetween. The isolating means comprises a cutout portion in the rim and an electrically insulating plug to fit therein.
Inventors
- 👤 John J. Pisano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:52
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/92
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
186 words
In combination with a cathode ray tube, a base therefor, said cathode ray tube having a cylindrical terminal portion closed by a substantially planar wall provided with a plurality of annularly spaced, projecting tube pins each surrounded by a raised nubbin with a diameter larger than said pins where said pins exit from said wall, said base comprising a flat, circular rim having a diameter substantially equal to that of said cylindrical terminal portion; a plurality of tube pin receiving apertures extending through said rim for engaging said tube pins, said apertures being spaced inwardly from the outer circumference of said rim; and at least one tube pin isolating means formed within said flat circular rim, said tube pin isolating means including a cut-out portion having a depth less than the thickness of said rim and extending over a circumferential arc of less than 180° and an electrically insulating plug formed to fit said cut-out portion, said plug containing at least one aperture for receiving one of said tube pins, said one aperture having a diameter at least as large as the diameter of said nubbin.
Claim 2
Dependent Claim
186 words
In combination with a cathode ray tube, a base therefor, said cathode ray tube having a cylindrical terminal portion closed by a substantially planar wall provided with a plurality of annularly spaced, projecting tube pins each surrounded by a raised nubbin with a diameter larger than said pins where said pins exit from said wall, said base comprising a flat, circular rim having a diameter substantially equal to that of said cylindrical terminal portion; a plurality of tube pin receiving apertures extending through said rim for engaging said tube pins, said apertures being spaced inwardly from the outer circumference of said rim; and at least one tube pin isolating means formed within said flat circular rim, said tube pin isolating means including a cut-out portion having a depth less than the thickness of said rim and extending over a circumferential arc of less than 180° and an electrically insulating plug formed to fit said cut-out portion, said plug containing at least one aperture for receiving one of said tube pins, said one aperture having a diameter at least as large as the diameter of said nubbin.
Claim 3
Dependent Claim
13 words
The base of claim 1 wherein said plug is formed from silicone rubber.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |