Patent US2635037A successfully refreshed from Google Patents.
US2635037A
Expired / Lapsed
US
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Preparation of zirconium tetrafluoride
Assignee: Individual
•
Filing: 1951-11-26
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Granted: 1953-04-14
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Expires: 1971-11-26
Abstract
No abstract record available.
Inventors
- 👤 Harley A Wilhelm
- 👤 Kenneth A Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:08
CPC Classifications
C; C01; C01G; C01G25/00; C01G25/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A PROCESS OF PREPARING ZIRCONIUM TETRAFLUORIDE, COMPRISING MIXTURE ZIRCONIUM OXYCHLORIDE WITH AN AQUEOUS SOLUTION OF HYDROFLUORIC ACID WHEREBY AN INTERMEDIATE ZIRCONIUM FLUORIDE PRECIPITATES AND HEAT IS DEVELOPED, ALLOWING THE REACTION MIXTURE TO COOL TO ROOM TEMPERATURE, SEPARATING THE ZIRCONIUM FLUORIDE PRECIPITATE FROM MOTHER LIQUOR, AND DRYING AND HEAT-TREATING THE PRECIPITATE AT A TEMPERATURE UP TO 575* C.
Claim 2
Dependent Claim
57 words
A PROCESS OF PREPARING ZIRCONIUM TETRAFLUORIDE, COMPRISING MIXTURE ZIRCONIUM OXYCHLORIDE WITH AN AQUEOUS SOLUTION OF HYDROFLUORIC ACID WHEREBY AN INTERMEDIATE ZIRCONIUM FLUORIDE PRECIPITATES AND HEAT IS DEVELOPED, ALLOWING THE REACTION MIXTURE TO COOL TO ROOM TEMPERATURE, SEPARATING THE ZIRCONIUM FLUORIDE PRECIPITATE FROM MOTHER LIQUOR, AND DRYING AND HEAT-TREATING THE PRECIPITATE AT A TEMPERATURE UP TO 575* C.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-13 | 1956-10-13 | 1957-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-13 | 1960-10-13 | 1961-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-13 | 1964-10-13 | 1965-04-14 | $7700.00 | Window Closed / Lapsed |