US3361548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making cathode ray tube filters
Assignee: McDonnell Douglas Corp
•
Filing: 1965-06-21
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Granted: 1968-01-02
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Expires: 1985-06-21
Abstract
No abstract record available.
Inventors
- 👤 Vern E Hamilton
- 👤 Harold F Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:38
CPC Classifications
G; G02; G02B; G02B5/00; H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J29/896; Y; Y10; Y10S; Y10S359/00; Y10S359/90; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/24868; Y10T428/24876
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A METHOD OF PRODUCING AN INTEGRAL, PERMANENT FILTER ELEMENT OF A SPACE LATTICE TYPE AMBIENT LIGHT TRAPPING FILETER, COMPRISING: PROVIDING A LATERALLY EXTENSIVE TRANSPARENT LAYER OF GLASS; DEPOSITING ON ONE FACE THEREOF A UNIFORM LAYER OF SUBSTANTIALLY OPAQUE BLACK FRIT; REMOVING SELECTED PORTIONS OF SAID FRIT LAYER TO PRODUCE A DESIRED GRID PATTERN OF ALTERNATING OPAQUE AND CLEAR AREAS; AND FUSING THE REMAINING BLACK FRIT TO SAID FACE TO PRODUCE AN INTEGRAL, PERMANENT BLACK GRID PATTERN THEREON.
Claim 2
Independent Claim
77 words
A METHOD OF PRODUCING AN INTEGRAL, PERMANENT FILTER ELEMENT OF A SPACE LATTICE TYPE AMBIENT LIGHT TRAPPING FILETER, COMPRISING: PROVIDING A LATERALLY EXTENSIVE TRANSPARENT LAYER OF GLASS; DEPOSITING ON ONE FACE THEREOF A UNIFORM LAYER OF SUBSTANTIALLY OPAQUE BLACK FRIT; REMOVING SELECTED PORTIONS OF SAID FRIT LAYER TO PRODUCE A DESIRED GRID PATTERN OF ALTERNATING OPAQUE AND CLEAR AREAS; AND FUSING THE REMAINING BLACK FRIT TO SAID FACE TO PRODUCE AN INTEGRAL, PERMANENT BLACK GRID PATTERN THEREON.
References Cited (Backward Citations)
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Cited
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US3278326A
Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-01 | 1971-07-03 | 1972-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-01 | 1975-07-03 | 1976-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-01 | 1979-07-03 | 1980-01-02 | $7700.00 | Window Closed / Lapsed |