Patent US2886730A successfully refreshed from Google Patents.
US2886730A
Expired / Lapsed
US
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Aperture mask coating to prevent cathode poisoning
Assignee: Corning Glass Works
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Filing: 1957-02-25
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Granted: 1959-05-12
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Expires: 1977-02-25
Abstract
No abstract record available.
Inventors
- 👤 John L Sheldon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:09
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/34; D; D01; D01H; D01H7/00; D01H7/02; D01H7/52; D01H7/60; D01H7/604; H01J29/06; H01J29/07; H01J2209/00; H01J2209/38; H01J2209/385; H01J2229/00; H01J2229/07; H01J2229/0727; H01J2229/0777
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A PERFORATE MASK FOR ASSEMBLY IN A CATHODE RAY TUBE TO SELECTIVELY TRANSMIT ELECTRON BEAMS WHICH COMPRISES A PERFORATED GLASS SHEET HAVING ON ITS ELECTRON INTERCEPTING SURFACE A COATING COMPOSED OF A CHEMICALLY ACTIVE METAL COMPRISING A GETTER WHICH IS, IN TURN, COVERED AND A PROTECTIVE LAYER OF INACTIVE METAL.
Claim 2
Dependent Claim
50 words
A PERFORATE MASK FOR ASSEMBLY IN A CATHODE RAY TUBE TO SELECTIVELY TRANSMIT ELECTRON BEAMS WHICH COMPRISES A PERFORATED GLASS SHEET HAVING ON ITS ELECTRON INTERCEPTING SURFACE A COATING COMPOSED OF A CHEMICALLY ACTIVE METAL COMPRISING A GETTER WHICH IS, IN TURN, COVERED AND A PROTECTIVE LAYER OF INACTIVE METAL.
References Cited (Backward Citations)
US2437941A
Cited
US2777084A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-11 | 1962-11-10 | 1963-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-11 | 1966-11-10 | 1967-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-11 | 1970-11-10 | 1971-05-12 | $7700.00 | Window Closed / Lapsed |