US2921836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of treating metals
Assignee: Unifrax I LLC
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Filing: 1956-04-24
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Granted: 1960-01-19
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Expires: 1976-04-24
Abstract
No abstract record available.
Inventors
- 👤 Andrew T Mccord
- 👤 Donald R Spink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:29
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C22; C22B; C22B34/00; C22B34/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A PROCESS OF MAKING AN AMMONIUIM METAL FLUORIDE SETTLED FROM THE GROUP CONSISTING OF AMMONIUM ZIRCONIUM FLUORIDE, AMMONIUM HAFNIUM FLUORIDE, AND AMMONIUM TITANIUM FLUORIDE WHICH COMPRISES DISSOLVING THE ONE OF SAID METALS THE FLUORIDE OF WHICH IS TO BE MADE IN A SUBSTANTIALLY NEUTRAL SOLUTION CONSISTING OF AMMONIUM FLUORIDE AND WATER, INCREASING THE AMMONIUM FLUORIDE CONCENTRATION OF THE AMMONIUM FLUORIDE SOLUTION TO PRECIPITATE THE AMMONIUM METAL FLUORIDE IN CRYSTALLINE
Claim 2
Dependent Claim
69 words
A PROCESS OF MAKING AN AMMONIUIM METAL FLUORIDE SETTLED FROM THE GROUP CONSISTING OF AMMONIUM ZIRCONIUM FLUORIDE, AMMONIUM HAFNIUM FLUORIDE, AND AMMONIUM TITANIUM FLUORIDE WHICH COMPRISES DISSOLVING THE ONE OF SAID METALS THE FLUORIDE OF WHICH IS TO BE MADE IN A SUBSTANTIALLY NEUTRAL SOLUTION CONSISTING OF AMMONIUM FLUORIDE AND WATER, INCREASING THE AMMONIUM FLUORIDE CONCENTRATION OF THE AMMONIUM FLUORIDE SOLUTION TO PRECIPITATE THE AMMONIUM METAL FLUORIDE IN CRYSTALLINE
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) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |