US2979387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etching
Assignee: Dow Chemical Co
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Filing: 1956-08-27
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Granted: 1961-04-11
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Expires: 1976-08-27
Abstract
No abstract record available.
Inventors
- 👤 John A Easley
- 👤 Charles W Hopkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:10
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
THE METHOD OF ETCHING A PHOTOENGRAVING PLATE CONSISTING OF MAGNESIUM, MAGNESIUM BASE ALLOYS CONTAINING AT LEAST 90 PERCENT MAGNESIUM, ZINC AND ZINC BASE ALLOYS CONTAINING AT LEAST 90 PERCENT ZINC, WHICH COMPRISES PADDING AN ETCHING BATH COMPRISING A MIXTURE OF (1) AN AQUEOUS SOLUTION CONTAINING FROM 3 TO 20 PERCENT BY WEIGHT OF NITRIC ACID, FROM 0.1 TO 2.0 PERCENT BY WEIGHT OF AN ALKYLARYLSULFONATE SELECTED FROM THE GROUP CONSISTING OF THE ALKYLBENZENE SULFONATES WHEREIN THE ALKYL PORTION CONTAINS FROM 8 TO 18 CARBON ATOMS AND THE ALKYLNAPTHALENE SULFONATES WHEREIN THE ALKYL PORTION CONTAINS FROM 3 TO 18 CARBON ATOMS AND (2) A WATER-IMMISCIBLE ORGANIC LIQUID SELECTED FROM THE GROUP CONSISTING OF PETROLEUM HYDROCARBONS AND HYDROCARBON DERIVATIVES BOILING WITHIN THE RANGE OF 70* TO 390*C. AND SUBSTANTIALLY UNREACTIVE WITH THE AQUEOUS NITRIC ACID SOLUTION AND PRESENT IN AN AMOUNT OF FROM 1 TO 14 PERCENT BY WEIGHT OF THE AQUEOUS NITRIC ACID SOLUTION, SAID PADDLING BEING SUFFICIENTLY VIGOROUS TO INTERMITTENTLY THROW THE BATH AGAINST SAID PLATE IN SHEETS AND CONTINUING THIS PADDLING ACTION UNTIL THE PLATE HAS BEEN ETCHED TO A SATISFACTORY DEPTH.
Claim 2
Independent Claim
183 words
THE METHOD OF ETCHING A PHOTOENGRAVING PLATE CONSISTING OF MAGNESIUM, MAGNESIUM BASE ALLOYS CONTAINING AT LEAST 90 PERCENT MAGNESIUM, ZINC AND ZINC BASE ALLOYS CONTAINING AT LEAST 90 PERCENT ZINC, WHICH COMPRISES PADDING AN ETCHING BATH COMPRISING A MIXTURE OF (1) AN AQUEOUS SOLUTION CONTAINING FROM 3 TO 20 PERCENT BY WEIGHT OF NITRIC ACID, FROM 0.1 TO 2.0 PERCENT BY WEIGHT OF AN ALKYLARYLSULFONATE SELECTED FROM THE GROUP CONSISTING OF THE ALKYLBENZENE SULFONATES WHEREIN THE ALKYL PORTION CONTAINS FROM 8 TO 18 CARBON ATOMS AND THE ALKYLNAPTHALENE SULFONATES WHEREIN THE ALKYL PORTION CONTAINS FROM 3 TO 18 CARBON ATOMS AND (2) A WATER-IMMISCIBLE ORGANIC LIQUID SELECTED FROM THE GROUP CONSISTING OF PETROLEUM HYDROCARBONS AND HYDROCARBON DERIVATIVES BOILING WITHIN THE RANGE OF 70* TO 390*C. AND SUBSTANTIALLY UNREACTIVE WITH THE AQUEOUS NITRIC ACID SOLUTION AND PRESENT IN AN AMOUNT OF FROM 1 TO 14 PERCENT BY WEIGHT OF THE AQUEOUS NITRIC ACID SOLUTION, SAID PADDLING BEING SUFFICIENTLY VIGOROUS TO INTERMITTENTLY THROW THE BATH AGAINST SAID PLATE IN SHEETS AND CONTINUING THIS PADDLING ACTION UNTIL THE PLATE HAS BEEN ETCHED TO A SATISFACTORY DEPTH.
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) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |