US3639799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shadow mask with reinforcing ring for colored television picture tube
Assignee: Tubal Ind Inc
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Filing: 1969-04-02
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Granted: 1972-02-01
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Expires: 1989-04-02
Abstract
Abstract A shadow mask for color TV picture tubes contains the conventional foraminous or translucent area formed by a multiple of miniature apertures in a curved portion of a thin metal sheet through which the electron beams pass in traveling from the electron guns at the rear of the tube to the viewing face at the front of the tube. Around the translucent area is an imperforate section formed into a wall and a flange and containing strengthening ribs. A reinforcing ring rigidly attached to the flange provides additional stability.
Inventors
- 👤 Myron C Kirchner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:58
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/06; H01J29/07; H01J29/073; H01J9/00; H01J9/02; H01J9/14; H01J9/142; H01J2229/00; H01J2229/07; H01J2229/0722; H01J2229/0727; H01J2229/0766; H01J2229/0772
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
106 words
A reinforced shadow mask for a colored television picture tube, comprising: a thin metal sheet having a front section containing a curved translucent area defined by a myriad of miniature apertures through the metal sheet, an imperforate margin area around the translucent area, a further imperforate section bent back from the margin area at about 90* to form a rearwardly directed wall, said wall containing a continuous strengthening rib, the other end of the wall section being bent to form an inwardly directed flange; and a planar metal reinforcing ring rigidly attached to said flange with the ring in surface to surface contact with the flange.
Claim 2
Dependent Claim
106 words
A reinforced shadow mask for a colored television picture tube, comprising: a thin metal sheet having a front section containing a curved translucent area defined by a myriad of miniature apertures through the metal sheet, an imperforate margin area around the translucent area, a further imperforate section bent back from the margin area at about 90* to form a rearwardly directed wall, said wall containing a continuous strengthening rib, the other end of the wall section being bent to form an inwardly directed flange; and a planar metal reinforcing ring rigidly attached to said flange with the ring in surface to surface contact with the flange.
Claim 3
Dependent Claim
19 words
The invention as in claim 1 wherein the strengthening rib is a continuous groove formed in the metal sheet.
Claim 4
Dependent Claim
32 words
The invention as set forth in claim 1 further including a plurality of shallow grooves in said wall extending in a direction across said continuous rib, said grooves forming strengthening cross ribs.
Claim 5
Dependent Claim
24 words
The invention as set forth in claim 3 wherein said cross ribs extend along said wall rearwardly from the continuous rib in said wall.
Claim 6
Dependent Claim
17 words
The invention as set forth in claim 3 wherein said cross ribs are parallel to one another.
Claim 7
Dependent Claim
18 words
The invention as in claim 3 wherein said cross ribs extend at least part way onto the flange.
Claim 8
Dependent Claim
18 words
The invention as set forth in claim 1 wherein the inner edge of said annulus is flared rearwardly.
Claim 9
Dependent Claim
30 words
The invention as set forth in claim 1 wherein said annulus is characterized by being thicker than the metal sheet and forms a thermally stable combination with the metal sheet.
Claim 10
Dependent Claim
23 words
The invention as set forth in claim 8 wherein the annulus is in the order of twice the thickness of the metal sheet.
Claim 11
Dependent Claim
19 words
The invention as set forth in claim 8 wherein said metal annulus also flares outwardly beyond said wall section.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |