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US3867207A
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US
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Method of blackening a steel component for a color cathode ray tube
Assignee: GTE Sylvania Inc
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Filing: 1973-05-29
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Granted: 1975-02-18
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Expires: 1993-05-29
Abstract
Abstract The steel components of a cathode ray tube, mainly the aperture mask and the aperture mask frame are blackened by immersing the same in an electroless plating bath selected from the group consisting of nickel and cobalt and after subsequent rinses immersing again in a strong oxidizing acid and firing the component in air at about 450*C to form a black, complex nickel or cobalt compound on the surface of the component.
Inventors
- 👤 John J Decker
- 👤 Susan V Zito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:26
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/14; H01J9/142; H01J9/146
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
124 words
A METHOD OF BLACKENING A STEEL COMPONENT WHICH COMPRISES THE STEPS OF: DEGREASING SAID COMPONENT; IMMERSING SAID COMPONENT IN A 50% HYDROCHLORIC ACID BATH FOR ABOUT 1 MINUTE; RINSING SAID COMPONENT IS DEIONIZED WATER; IMMERSING SAID COMPONENT IN AN ELECTROLESS PLATING BATH SELECTED FROM THE GROUP CONSISTING OF NICKEL OF COBATH FOR ABOUT 15 MINUTES, SAID PLATING BATH INCLUDING AN EFFECTIVE AMOUNT OF A REDUCING AGENT INCLUDING A HYPOPHOSPHITE COMPOUND; RINSING SAID COMPONENT IN DEIONIZED WATER; IMMERSING SAID COMPONENT IN A STRONG OXIDING ACID BATH FOR 30 TO 45 SECONDS, RINSING SAID COMPONENT IN WARM TAP WATER; RERINSING SAID COMPONENT IN DEIONIZED WATER; RERINSING SAID COMPONENT IN ANHYDROL; DRYING SAID COMPONENT; AND FIRING SAID COMPONENT IN AIR FOR ABOUT 1 HOUR AT ABOUT 450*C.
Claim 2
Independent Claim
124 words
A METHOD OF BLACKENING A STEEL COMPONENT WHICH COMPRISES THE STEPS OF: DEGREASING SAID COMPONENT; IMMERSING SAID COMPONENT IN A 50% HYDROCHLORIC ACID BATH FOR ABOUT 1 MINUTE; RINSING SAID COMPONENT IS DEIONIZED WATER; IMMERSING SAID COMPONENT IN AN ELECTROLESS PLATING BATH SELECTED FROM THE GROUP CONSISTING OF NICKEL OF COBATH FOR ABOUT 15 MINUTES, SAID PLATING BATH INCLUDING AN EFFECTIVE AMOUNT OF A REDUCING AGENT INCLUDING A HYPOPHOSPHITE COMPOUND; RINSING SAID COMPONENT IN DEIONIZED WATER; IMMERSING SAID COMPONENT IN A STRONG OXIDING ACID BATH FOR 30 TO 45 SECONDS, RINSING SAID COMPONENT IN WARM TAP WATER; RERINSING SAID COMPONENT IN DEIONIZED WATER; RERINSING SAID COMPONENT IN ANHYDROL; DRYING SAID COMPONENT; AND FIRING SAID COMPONENT IN AIR FOR ABOUT 1 HOUR AT ABOUT 450*C.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein said component is a steel frame of an aperture mask.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein said component is a steel aperture mask.
Claim 5
Dependent Claim
23 words
The method of claim 1 wherein said oxidizing acid is comprised of 3 parts phosphoric, 1 part sulfuric, and 1 part nitric acid.
References Cited (Backward Citations)
US2836510A
Cited
US3088846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |