US3793035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of developing opaquely coated sensitized matrix with periodate containing solution
Assignee: Westinghouse Electric Corp
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Filing: 1973-05-16
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Granted: 1974-02-19
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Expires: 1993-05-16
Abstract
Abstract A method for establishing a light absorbing pattern on a screen substrate of an image display device wherein opaquely coated sensitized matrix material is developed with a periodate containing solution to remove the sensitized matrix while leaving behind the opaque light absorbing pattern on the screen substrate.
Inventors
- 👤 H Patel
- 👤 D Griswold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:52
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271; H01J9/2278
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
25 words
The method specified in claim 1, wherein the periodate concentration in the developing solution is from about 0.02 to 0.4 weight percent of the solution.
Claim 2
Dependent Claim
26 words
The method specified in claim 1, wherein the periodate is supplied as potassium meta-periodate in a concentration of about 0.05 weight percent of the developing solution.
Claim 3
Dependent Claim
20 words
The method specified in claim 1, wherein the pH of the periodate containing solution is from about 3 to 9.
Claim 4
Dependent Claim
20 words
The method specified in claim 1, wherein the pH of the solution is made basic by addition of ammonium hydroxide.
Claim 5
Dependent Claim
29 words
The method specified in claim 1, wherein the pH is made acidic by addition of selected acid of the group consisting of acetic acid, citric acid, and sulphuric acid.
Claim 6
Dependent Claim
16 words
The method specified in claim 1, wherein the pH of the solution is preferably about 3.
Claim 7
Dependent Claim
13 words
The method specified in claim 7, wherein the preferred acid is sulphuric acid.
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |