Patent US2865880A successfully refreshed from Google Patents.
US2836751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube manufacture
Assignee: RCA Corp
•
Filing: 1954-08-02
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Granted: 1958-05-27
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Expires: 1974-08-02
Abstract
No abstract record available.
Inventors
- 👤 John C Turnbull
- 👤 Richard D Faulkner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:59
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/88; H01J29/02; H01J29/10; H01J29/18; H01J2229/00; H01J2229/88; H01J2229/885; Y; Y10; Y10S; Y10S228/00; Y10S228/903; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49888
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
THE METHOD OF APPLYING A MAT BLACK, RUST-RESISTANT, NON-SCALING, ELECTRICALLY CONDUCTIVE COATING TO THE INTERIOR OF A LOW CARBON STEEL ENVELOPE PORTION FOR AN ELECTRON DISCHARGE DEVICE, SAID METHOD COMPRISING REMOVING SUFFICIENT METAL FROM THE INTERIOR SURFACE OF SAID ENVELOPE PORTION TO IMPART A DULL METALLIC FINISH THERETO, SEALING A GLASS FACE PLATE AND A GLASS FUNNEL PORTION TO SAID STEEL ENVELOPE PORTION TO FORM A COMPOSITE SEALED ASSEMBLY, ANNEALING SAID SEALED ASSEMBLY IN AN OXIDIZING ATMOSPHERE AND IN THE TEMPERATURE RANGE OF ABOUT 425-575*C. TO FORM A TIGHTLY ADHERENT IRON OXIDE COATING ON THE INTERIOR OF SAID STEEL ENVELOPE PORTION, AND COOLING SAID SEALED ASSEMBLY TO THE AMBIENT TEMPERATURE, SAID IRON OXIDE COATING BEING MAT BLACK, RUST-RESISTANT, NON-SCALING, AND ELECTRICALLY CONDUCTIVE.
Claim 2
Independent Claim
122 words
THE METHOD OF APPLYING A MAT BLACK, RUST-RESISTANT, NON-SCALING, ELECTRICALLY CONDUCTIVE COATING TO THE INTERIOR OF A LOW CARBON STEEL ENVELOPE PORTION FOR AN ELECTRON DISCHARGE DEVICE, SAID METHOD COMPRISING REMOVING SUFFICIENT METAL FROM THE INTERIOR SURFACE OF SAID ENVELOPE PORTION TO IMPART A DULL METALLIC FINISH THERETO, SEALING A GLASS FACE PLATE AND A GLASS FUNNEL PORTION TO SAID STEEL ENVELOPE PORTION TO FORM A COMPOSITE SEALED ASSEMBLY, ANNEALING SAID SEALED ASSEMBLY IN AN OXIDIZING ATMOSPHERE AND IN THE TEMPERATURE RANGE OF ABOUT 425-575*C. TO FORM A TIGHTLY ADHERENT IRON OXIDE COATING ON THE INTERIOR OF SAID STEEL ENVELOPE PORTION, AND COOLING SAID SEALED ASSEMBLY TO THE AMBIENT TEMPERATURE, SAID IRON OXIDE COATING BEING MAT BLACK, RUST-RESISTANT, NON-SCALING, AND ELECTRICALLY CONDUCTIVE.
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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) | 1961-05-26 | 1961-11-25 | 1962-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-26 | 1965-11-25 | 1966-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-26 | 1969-11-25 | 1970-05-27 | $7700.00 | Window Closed / Lapsed |