US3722044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabrication of focus grill type cathode ray tubes
Assignee: RCA Licensing Corp
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Filing: 1971-11-10
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Granted: 1973-03-27
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Expires: 1991-11-10
Abstract
Abstract Prior to assembly of the envelope of a focus grill tube, the cup-shaped panel portion of the envelope is wound with a wire helix which is disposed around and along the panel, each turn of the helix extending across the open side of the panel in predisposed relation with a pattern of phosphor strips on the bottom wall of the panel. Preferably, the helix turns are disposed in grooves in the end surface of the side wall of the panel, and portions of each helix turn are disposed about a member having a thermal expansion greater than that of the helix wire.
Inventors
- 👤 H Law
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:21
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/80; H01J29/803
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
86 words
A method of fabricating an electron discharge tube comprising a generally cup-shaped panel, said method comprising: winding a helix of wire around the outside of and along said panel, the turns of said helix extending across the open end of said panel in preselected relation with respect to a pattern of phosphor on the bottom wall of said panel; sealing portions of said helix turns to the side wall of said panel; and removing the portions of said helix extending around the outside of said panel.
Claim 2
Independent Claim
86 words
A method of fabricating an electron discharge tube comprising a generally cup-shaped panel, said method comprising: winding a helix of wire around the outside of and along said panel, the turns of said helix extending across the open end of said panel in preselected relation with respect to a pattern of phosphor on the bottom wall of said panel; sealing portions of said helix turns to the side wall of said panel; and removing the portions of said helix extending around the outside of said panel.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein said winding step comprises disposing each helix turn in a pair of oppositely disposed grooves in the end surface of said side wall.
Claim 4
Dependent Claim
30 words
The method of claim 1 including disposing an expansion member between said helix and said panel for maintaining the turns of said helix under tension during heating of said helix.
Claim 5
Independent Claim
183 words
A method of fabricating an electron discharge tube comprising a generally cup-shaped panel having a bottom wall and a side wall, and an open-ended envelope member, the open end of said envelope member being sealed to the end surface of the side wall of saId panel, said method comprising: providing a patterned layer of phosphor on the bottom wall of said panel; providing an array of grooves in each of a pair of oppositely disposed portions of the end surface of said side wall, each groove of one array having a corresponding oppositely disposed groove in the other of said arrays, and said arrays of grooves being in predetermined position with respect to said phosphor pattern; winding a wire helix around said panel, each turn of said helix extending across the open end of said panel within and between two corresponding grooves of each of said groove arrays; frit-sealing the end of said envelope member to sad end surface of said panel, thereby sealing said turns within said grooves; and removing the portions of said turns extending around the outside of said panel.
Claim 6
Independent Claim
183 words
A method of fabricating an electron discharge tube comprising a generally cup-shaped panel having a bottom wall and a side wall, and an open-ended envelope member, the open end of said envelope member being sealed to the end surface of the side wall of saId panel, said method comprising: providing a patterned layer of phosphor on the bottom wall of said panel; providing an array of grooves in each of a pair of oppositely disposed portions of the end surface of said side wall, each groove of one array having a corresponding oppositely disposed groove in the other of said arrays, and said arrays of grooves being in predetermined position with respect to said phosphor pattern; winding a wire helix around said panel, each turn of said helix extending across the open end of said panel within and between two corresponding grooves of each of said groove arrays; frit-sealing the end of said envelope member to sad end surface of said panel, thereby sealing said turns within said grooves; and removing the portions of said turns extending around the outside of said panel.
Claim 7
Dependent Claim
42 words
The method of claim 4 wherein said winding step includes disposing a member having a thermal expansion greater than that of said wire between said helix and said panel for maintaining the turns of said helix under tension during said sealing operation.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |