US3557306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tubes with multiple convolution tension bands
Assignee: Thorn Radio Valves and Tubes Ltd
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Filing: 1968-02-28
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Granted: 1971-01-19
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Expires: 1988-02-28
Abstract
Abstract To reduce the implosion risks of the envelope of a cathode ray tube the flange of the face plate has two U-shaped metal strips cooperating to form an encircling close-fitting frame bonded to the flange. A tensioned metal band surrounds the frame and is in the form of a spiral winding of at least two convolutions.
Inventors
- 👤 James Inglis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:53
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/87; Y; Y10; Y10T; Y10T24/00; Y10T24/21
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
118 words
A cathode ray tube comprising a glass envelope having a glass face plate with a rearwardly extending flange joined at its periphery to a flared glass portion terminating in a neck which houses an electron gun or guns, the flange having an encircling metal structure in three parts, two of the metal parts consisting of U-shaped strips cooperating to form an encircling frame which is a close fit on and is bonded to the flange, and the third metal part consisting of a metal tension band surrounding the frame and tensioned to compress the frame on the flange, the tension bend being in the form of a spiral winding of at least two convolutions superposed on one another.
Claim 2
Dependent Claim
118 words
A cathode ray tube comprising a glass envelope having a glass face plate with a rearwardly extending flange joined at its periphery to a flared glass portion terminating in a neck which houses an electron gun or guns, the flange having an encircling metal structure in three parts, two of the metal parts consisting of U-shaped strips cooperating to form an encircling frame which is a close fit on and is bonded to the flange, and the third metal part consisting of a metal tension band surrounding the frame and tensioned to compress the frame on the flange, the tension bend being in the form of a spiral winding of at least two convolutions superposed on one another.
Claim 3
Dependent Claim
28 words
A cathode ray tube according to claim 1, wherein the front margin of the frame is bonded to the flange by means of a layer of synthetic resin.
Claim 4
Dependent Claim
20 words
A cathode ray tube according to claim 1, wherein each U-shaped strip includes a strengthening corrugation along its rear margin.
Claim 5
Dependent Claim
17 words
A cathode ray tube according to claim 1, wherein each of the U-shaped strips is of steel.
Claim 6
Dependent Claim
15 words
A cathode ray tube according to claim 1, wherein the tension band is of steel.
Claim 7
Dependent Claim
33 words
A cathode ray tube according to claim 1, wherein the front edges of the frame and the convolutions of the tension band lie substantially on the mould match line of the face plate.
Claim 8
Dependent Claim
51 words
A cathode ray tube according to claim 6, wherein the front margin of the frame is bonded to the flange by means of a layer of synthetic resin, the U-shaped strips and the tension band are of steel, and each U-shaped strip is formed with a strengthening corrugation along its length.
Claim 9
Dependent Claim
39 words
A cathode ray tube according to claim 1, wherein the rear margin of the frame is progressively increasingly spaced from the envelope and the space is filled with an adhesive filler adhering to the frame and to the envelope.
Claim 10
Dependent Claim
16 words
A cathode ray tube according to claim 8, wherein the adhesive filler is a synthetic resin.
Claim 11
Dependent Claim
76 words
A cathode ray tube according to claim 9, wherein the front edges of the frame and the convolutions of the tension band lie substantially on the mould match line of the face plate, the front margin of the frame is bonded to the flange by means of a layer of synthetic resin, the U-shaped strips and the tension band are of steel and each U-shaped strip is formed with a strengthening corrugation along its rear margin.
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |