US2940838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical milling
Assignee: Boeing Co
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Filing: 1957-08-19
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Granted: 1960-06-14
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Expires: 1977-08-19
Abstract
No abstract record available.
Inventors
- 👤 Snyder Herman Ben
- 👤 Ludwig M Rosenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:45
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
AN AQUEOUS ACIDIC COMPOSITION OF MATTER ADAPTED FOR CHEMICALLY MILLING METAL WHICH CONTAINS CHLORIDE, NITRATE AND A FERRIC ION THEREIN, THE CHLORIDE CONCENTRATION BEING AT LEAST ABOUT 1.0 NORMAL, THE NITRATE CONCENTRATION BEING AT LEAST ABOUT 0.75 NORMAL, THE FERRIC CONCENTRATION BEING AT LEAST ABOUT .07 MOLAR, THE AVAILABLE HYDROGEN ION CONCENTRATION BEING HOWEVER, AT LEAST 1.8 NORMAL, SAID COMPOSITION FURTHER INCLUDING A MINOR AMOUNT OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF AMMONIUM CHLORIDE AND STANNIC CHLORIDE, AMMONIUM CHLOROSTANNATE AND MIXTURE THEREOF.
Claim 2
Dependent Claim
84 words
AN AQUEOUS ACIDIC COMPOSITION OF MATTER ADAPTED FOR CHEMICALLY MILLING METAL WHICH CONTAINS CHLORIDE, NITRATE AND A FERRIC ION THEREIN, THE CHLORIDE CONCENTRATION BEING AT LEAST ABOUT 1.0 NORMAL, THE NITRATE CONCENTRATION BEING AT LEAST ABOUT 0.75 NORMAL, THE FERRIC CONCENTRATION BEING AT LEAST ABOUT .07 MOLAR, THE AVAILABLE HYDROGEN ION CONCENTRATION BEING HOWEVER, AT LEAST 1.8 NORMAL, SAID COMPOSITION FURTHER INCLUDING A MINOR AMOUNT OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF AMMONIUM CHLORIDE AND STANNIC CHLORIDE, AMMONIUM CHLOROSTANNATE AND MIXTURE THEREOF.
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 |