Patent US4585438A successfully refreshed from Google Patents.
Patent US2940837A successfully refreshed from Google Patents.
US2940837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etching bath for corrosion and heat resistant alloys and process of etching
Assignee: RTX Corp
•
Filing: 1956-12-31
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Granted: 1960-06-14
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Expires: 1976-12-31
Abstract
No abstract record available.
Inventors
- 👤 Walter L Acker
- 👤 Lloyd H Curkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:56
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
AN ETCHING BATH FOR CORROSION AND HEAT RESISTANT STEEL CONSISTING ESSENTIALLY OF BY WEIGHT AN AQUEOUS SOLUTION OF FROM 25% TO 301/2% OF HYDROCHLORIC ACID, FROM 91/2% TO 16% OF NITRIC ACID, FROM 0.15% TO 1% OF FERRIC CHLORIDE AND FROM 0.0015% TO 0.08% OF A WETTING AGENT STABLE IN THE PRESENCE OF NITRIC AND HYDROCHLORIC ACIDS.
Claim 2
Dependent Claim
57 words
AN ETCHING BATH FOR CORROSION AND HEAT RESISTANT STEEL CONSISTING ESSENTIALLY OF BY WEIGHT AN AQUEOUS SOLUTION OF FROM 25% TO 301/2% OF HYDROCHLORIC ACID, FROM 91/2% TO 16% OF NITRIC ACID, FROM 0.15% TO 1% OF FERRIC CHLORIDE AND FROM 0.0015% TO 0.08% OF A WETTING AGENT STABLE IN THE PRESENCE OF NITRIC AND HYDROCHLORIC 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) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |