US3600778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing the focusing grids of color television tubes
Assignee: Thales SA
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Filing: 1969-01-28
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Granted: 1971-08-24
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Expires: 1989-01-28
Abstract
Abstract A method of manufacturing focusing grids for color television tubes, consisting in first producing a sheet of wires having the desired accuracy in terms of pitch and flatness, on a prismatic drum the corners of which are constituted by precision screws in the threads of which the wires are laid. The wires are then preliminary fixed to channel irons carried by the side members of a precision frame. A substantial economy is achieved by using the same frame for manufacturing a great number of grids. Only the channel iron need to be changed.
Inventors
- 👤 Andre Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:35
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
A METHOD OF MANUFACTURING FOCUSING GRIDS FOR COLOR TELEVISION TUBES COMPRISING THE STEPS OF PREPARING A SHEET OF PARALLEL WIRES ON THE SIDES OF A PRISM-SHAPED DRUM, WHOSE EDGES ARE FORMED BY SCREWS OF HIGH PRECISION WHOSE PITCH IS THAT OF THE DESIRED GRID, SAID WIRES BEING POSITIONED IN THE THREADS OF SAID SCREWS, PREPARING A FRAME, MOUNTING, ON TWO OPPOSITE SIDE MEMBERS OF SAID FRAME, TWO REMOVABLE CHANNEL IRONS, AND FIXING THE WIRES OF A SHEET ON SAID CHANNEL IRONS ON WHICH THE GRID REMAINS UNTIL THE GRID IS CLAMPED BETWEEN THE FRONT WALL AND THE FLARED PORTION OF THE TUBE ENVELOPE, THE SAME FRAME BEING THUS USED FOR FORMING A PLURALITY OF GRIDS.
Claim 2
Independent Claim
115 words
A METHOD OF MANUFACTURING FOCUSING GRIDS FOR COLOR TELEVISION TUBES COMPRISING THE STEPS OF PREPARING A SHEET OF PARALLEL WIRES ON THE SIDES OF A PRISM-SHAPED DRUM, WHOSE EDGES ARE FORMED BY SCREWS OF HIGH PRECISION WHOSE PITCH IS THAT OF THE DESIRED GRID, SAID WIRES BEING POSITIONED IN THE THREADS OF SAID SCREWS, PREPARING A FRAME, MOUNTING, ON TWO OPPOSITE SIDE MEMBERS OF SAID FRAME, TWO REMOVABLE CHANNEL IRONS, AND FIXING THE WIRES OF A SHEET ON SAID CHANNEL IRONS ON WHICH THE GRID REMAINS UNTIL THE GRID IS CLAMPED BETWEEN THE FRONT WALL AND THE FLARED PORTION OF THE TUBE ENVELOPE, THE SAME FRAME BEING THUS USED FOR FORMING A PLURALITY OF GRIDS.
Claim 3
Dependent Claim
21 words
A method as claimed in claim 1, wherein said fixing on said fRame is performed by means of a metallizing torch.
Claim 4
Dependent Claim
25 words
A method as claimed in claim 1, wherein prior to fixing said grid on said frame, it is preliminarily fixed by means of an adhesive.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |