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Patent US2684892A successfully refreshed from Google Patents.
US2684892A
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Ferric chloride etching solutions
Assignee: RCA Corp
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Filing: 1953-01-14
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Granted: 1954-07-27
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Expires: 1973-01-14
Abstract
No abstract record available.
Inventors
- 👤 Theodore A Saulnier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:45
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
AN ETCHING COMPOSITION COMPRISING A WATER SOLUTION OF FERRIC CHLORIDE HAVING A SPECIFIC GRAVITY OF 35* TO 48* BAUME, 20 TO 50 GRAMS PER LITER OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF AMMONIUM PERSULFATE, ALKALI METAL PERSULFATES, AND A MIXTURE OF AMMONIUM AND ALKALI METAL PERSULFATES, AND 2% TO 10% BY VOLUME OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF CONCENTRATED HYDROCHLORIC ACID, CONCENTRATED NITRIC ACID, AND A MIXTURE OF HYDROCHLORIC AND NITRIC ACIDS.
Claim 2
Dependent Claim
77 words
AN ETCHING COMPOSITION COMPRISING A WATER SOLUTION OF FERRIC CHLORIDE HAVING A SPECIFIC GRAVITY OF 35* TO 48* BAUME, 20 TO 50 GRAMS PER LITER OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF AMMONIUM PERSULFATE, ALKALI METAL PERSULFATES, AND A MIXTURE OF AMMONIUM AND ALKALI METAL PERSULFATES, AND 2% TO 10% BY VOLUME OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF CONCENTRATED HYDROCHLORIC ACID, CONCENTRATED NITRIC ACID, AND A MIXTURE OF HYDROCHLORIC AND NITRIC ACIDS.
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) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |