US2828194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etching
Assignee: Dow Chemical Co
•
Filing: 1956-09-28
•
Granted: 1958-03-25
•
Expires: 1976-09-28
Abstract
No abstract record available.
Inventors
- 👤 Charles W Hopkins
- 👤 John A Easley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:23
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
THE METHOD OF ETCHING THE SURFACE OF AN ACIDSOLUBLE METAL SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM, ZINC, MAGNESIUM-BASE AND ZINC-BASE ALLOYS SAID SURFACE HAVING PORTIONS THEREOF MASKED WITH AN ACID RESISTANT COATING, WHICH INCLUDES: REPEATEDLY IMPINGING UPON THE SURFACE OF THE OBJECT SO AS TO CONTACT BOTH THE MASKED AND UNMASKED PORTIONS THEREOF AN AQUEOUS SOLUTION WHICH CONTAINS (1) FROM 1 TO 25 PERCENT OF HNO3, (2) A WATER-IMMISCIBLE ORGANIC LIQUID SUBSTANTIALLY UNREACTIVE WITH THE AQUEOUS NITRIC ACID, AND (3) BETWEEN 0.4 AND 2.0 PERCENT OF A COMPONENT WHICH INCLUDES A WATERSOLUBLE, ANIONIC, SULFATE-RAFICAL-CONTAINING, SURFACE-ACTIVE AGENT CONTAINING AT LEAST ONE HYDROPHOBIC GROUP OF FROM 10 TO 26 CARBON ATOMS IN AN UNINTERRUPTED CHAIN AND SAID AGENT CONTAINING AT LEAST 8 PERCENT SULFATION.
Claim 2
Independent Claim
123 words
THE METHOD OF ETCHING THE SURFACE OF AN ACIDSOLUBLE METAL SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM, ZINC, MAGNESIUM-BASE AND ZINC-BASE ALLOYS SAID SURFACE HAVING PORTIONS THEREOF MASKED WITH AN ACID RESISTANT COATING, WHICH INCLUDES: REPEATEDLY IMPINGING UPON THE SURFACE OF THE OBJECT SO AS TO CONTACT BOTH THE MASKED AND UNMASKED PORTIONS THEREOF AN AQUEOUS SOLUTION WHICH CONTAINS (1) FROM 1 TO 25 PERCENT OF HNO3, (2) A WATER-IMMISCIBLE ORGANIC LIQUID SUBSTANTIALLY UNREACTIVE WITH THE AQUEOUS NITRIC ACID, AND (3) BETWEEN 0.4 AND 2.0 PERCENT OF A COMPONENT WHICH INCLUDES A WATERSOLUBLE, ANIONIC, SULFATE-RAFICAL-CONTAINING, SURFACE-ACTIVE AGENT CONTAINING AT LEAST ONE HYDROPHOBIC GROUP OF FROM 10 TO 26 CARBON ATOMS IN AN UNINTERRUPTED CHAIN AND SAID AGENT CONTAINING AT LEAST 8 PERCENT SULFATION.
References Cited (Backward Citations)
US2640765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |