US4908995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rail grinding method and apparatus
Assignee: Zenith Electronics LLC
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Filing: 1988-01-04
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Granted: 1990-03-20
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Expires: 2008-01-04
Abstract
Abstract For use in the manufacture of flat tension mask cathode ray tubes, a method for forming on a mask support structure a mask receiving surface in a plane parallel to and at a precise fixed distance from the plane of the inner surface of a glass front panel embodying the tube's viewing screen.
Inventors
- 👤 Lawrence W. Dougherty
- 👤 James R. Fendley
- 👤 William H. Meyle
- 👤 James L. Kraner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:05
CPC Classifications
B; B24; B24B; B24B41/00; B24B41/06; H; H01; H01J; H01J9/00; H01J9/02; H01J9/14; H01J9/142
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
92 words
In the manufacture of a tension mask color cathode ray tube front assembly, the method comprising: providing a flat glass front panel having a planar inner surface; mounting a shadow mask support structure on said planar inner surface with an unfinished shadow mask receiving surface spaced an approximate distance from said planar inner surface of said glass front panel; and removing material from said unfinished mask receiving surface to produce a finished mask receiving surface which is parallel to and precisely spaced from said planar inner surface of said glass front panel.
Claim 2
Dependent Claim
92 words
In the manufacture of a tension mask color cathode ray tube front assembly, the method comprising: providing a flat glass front panel having a planar inner surface; mounting a shadow mask support structure on said planar inner surface with an unfinished shadow mask receiving surface spaced an approximate distance from said planar inner surface of said glass front panel; and removing material from said unfinished mask receiving surface to produce a finished mask receiving surface which is parallel to and precisely spaced from said planar inner surface of said glass front panel.
Claim 3
Dependent Claim
101 words
In the manufacture of a tension mask color cathode ray tube front assembly, the method comprising: providing a flat glass front panel having a planar inner surface; grinding said planar inner surface to a predetermined flatness; mounting a shadow mask support structure on said planar inner surface with an unfinished metal shadow mask receiving surface spaced an approximate distance from said planar inner surface of said glass front panel; grinding material from said unfinished mask receiving surface to produce a finished mask receiving surface which is parallel to and precisely spaced from said planar inner surface of said glass front panel.
Claim 4
Dependent Claim
101 words
In the manufacture of a tension mask color cathode ray tube front assembly, the method comprising: providing a flat glass front panel having a planar inner surface; grinding said planar inner surface to a predetermined flatness; mounting a shadow mask support structure on said planar inner surface with an unfinished metal shadow mask receiving surface spaced an approximate distance from said planar inner surface of said glass front panel; grinding material from said unfinished mask receiving surface to produce a finished mask receiving surface which is parallel to and precisely spaced from said planar inner surface of said glass front panel.
Claim 5
Dependent Claim
116 words
In the manufacture of a tension mask color cathode ray tube front assembly, the method comprising: providing a flat glass front panel having a planar inner surface; mounting a shadow mask support structure on said planar inner surface with an unfinished shadow mask receiving surface spaced an approximate distance from said planar inner surface of said glass front panel; supporting said glass front panel with reference to a plane coincident with said planar inner surface; removing material from said unfinished mask receiving surface with reference to said plane to produce a finished mask receiving surface which is parallel to and precisely spaced from said plane and thus said planar inner surface of said glass front panel.
Claim 6
Dependent Claim
116 words
In the manufacture of a tension mask color cathode ray tube front assembly, the method comprising: providing a flat glass front panel having a planar inner surface; mounting a shadow mask support structure on said planar inner surface with an unfinished shadow mask receiving surface spaced an approximate distance from said planar inner surface of said glass front panel; supporting said glass front panel with reference to a plane coincident with said planar inner surface; removing material from said unfinished mask receiving surface with reference to said plane to produce a finished mask receiving surface which is parallel to and precisely spaced from said plane and thus said planar inner surface of said glass front panel.
Claim 7
Dependent Claim
127 words
In the manufacture of a tension mask color cathode ray tube front assembly, the method comprising: providing a flat glass front panel having a planar inner surface; grinding said planar inner surface to a predetermined flatness; mounting a metal shadow mask support structure on said planar inner surface with an unfinished shadow mask receiving surface spaced an approximate distance from said planar inner surface of said glass front panel; supporting said glass front panel with reference to a plane coincident with said planar inner surface; and grinding material from said unfinished mask receiving surface with reference to said plane to produce a finished mask receiving surface which is parallel to and precisely spaced from said plane and thus said planar inner surface of said glass front panel.
Claim 8
Dependent Claim
127 words
In the manufacture of a tension mask color cathode ray tube front assembly, the method comprising: providing a flat glass front panel having a planar inner surface; grinding said planar inner surface to a predetermined flatness; mounting a metal shadow mask support structure on said planar inner surface with an unfinished shadow mask receiving surface spaced an approximate distance from said planar inner surface of said glass front panel; supporting said glass front panel with reference to a plane coincident with said planar inner surface; and grinding material from said unfinished mask receiving surface with reference to said plane to produce a finished mask receiving surface which is parallel to and precisely spaced from said plane and thus said planar inner surface of said glass front panel.
Claim 9
Dependent Claim
78 words
In the manufacture of a tension mask color cathode ray tube front assembly, the method comprising: providing a flat glass front panel having an inner surface; securing a shadow mask support structure on said inner surface with an unfinished shadow mask receiving surface spaced from said inner surface of said glass front panel; and removing material from said unfinished mask receiving surface to produce a flat mask receiving surface adapted to support by weldments a tensed shadow mask.
Claim 10
Dependent Claim
78 words
In the manufacture of a tension mask color cathode ray tube front assembly, the method comprising: providing a flat glass front panel having an inner surface; securing a shadow mask support structure on said inner surface with an unfinished shadow mask receiving surface spaced from said inner surface of said glass front panel; and removing material from said unfinished mask receiving surface to produce a flat mask receiving surface adapted to support by weldments a tensed shadow mask.
Claim 11
Dependent Claim
147 words
In the manufacture of a tensed foil mask cathode ray tube front assembly, a method comprising: providing a glass front panel having a planar inner surface; mounting on said inner surface a mask support for receiving a foil mask, said support structure having an unfinished mask receiving surface spaced an approximate distance from said outer surface; positioning said glass front panel such that said planar inner surface is in a known reference plane; measuring the distance from said plane of said mask receiving surface to the plane of said planar inner surface of said front panel; and removing material from said unfinished mask receiving surface in response to distance measurements thus developed to produce a mask receiving surface on said mask support structure in a plane parallel to and at a precise fixed distance from the plane of said planar inner surface of said glass front panel.
Claim 12
Dependent Claim
147 words
In the manufacture of a tensed foil mask cathode ray tube front assembly, a method comprising: providing a glass front panel having a planar inner surface; mounting on said inner surface a mask support for receiving a foil mask, said support structure having an unfinished mask receiving surface spaced an approximate distance from said outer surface; positioning said glass front panel such that said planar inner surface is in a known reference plane; measuring the distance from said plane of said mask receiving surface to the plane of said planar inner surface of said front panel; and removing material from said unfinished mask receiving surface in response to distance measurements thus developed to produce a mask receiving surface on said mask support structure in a plane parallel to and at a precise fixed distance from the plane of said planar inner surface of said glass front panel.
References Cited (Backward Citations)
US2543236A
Cited
JPS5796527A
Cited
JPS59124721A
Cited
US4704094A
Cited
US4695761A
Cited
US4711438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-19 | 1993-09-18 | 1994-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-19 | 1997-09-18 | 1998-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-19 | 2001-09-18 | 2002-03-20 | $7700.00 | Window Closed / Lapsed |