US2860956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of metals and their compounds
Assignee: Individual
•
Filing: 1949-04-18
•
Granted: 1958-11-18
•
Expires: 1969-04-18
Abstract
No abstract record available.
Inventors
- 👤 Arden Thomas Victor
- 👤 Burstall Francis Hereward
- 👤 Davies Glynn Rees
- 👤 Linstead Reginald Patrick
- 👤 Wells Ronald Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:49
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/04; C22B3/16; C22B3/1608; C22B3/1616; C01; C01G; C01G25/00; C01G25/003; C22B3/20; C22B3/22; C22B3/24; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A METHOD OF SEPARATING ZIRCONIUM NITRATE FROM HAFNIUM NITRATE WHEREIN THE SAID NITRATES IN ADMIXTURE ARE ADDED TO A MASS OF CELLULOSE PULP, THE NITRATES OF THE METALS AND THE CELLULOSE PULP ARE ELUTED WITH DIETHYL ETHER CONTAINING 12.5 PERCENT BY VOLUME OF NITRIC ACID OF DENSITY 1.42 AND THE ELUENT IS CAUSED TO PASS THROUGH A COLUMN OF CELLULOSE PULP AND EFFLUENT FROM THE COLUMN CONTAINING ZIRCONIUM NITRATE SUBSTANTIALLY FREE FROM HAFNIUM IS COLLECTED.
Claim 2
Independent Claim
75 words
A METHOD OF SEPARATING ZIRCONIUM NITRATE FROM HAFNIUM NITRATE WHEREIN THE SAID NITRATES IN ADMIXTURE ARE ADDED TO A MASS OF CELLULOSE PULP, THE NITRATES OF THE METALS AND THE CELLULOSE PULP ARE ELUTED WITH DIETHYL ETHER CONTAINING 12.5 PERCENT BY VOLUME OF NITRIC ACID OF DENSITY 1.42 AND THE ELUENT IS CAUSED TO PASS THROUGH A COLUMN OF CELLULOSE PULP AND EFFLUENT FROM THE COLUMN CONTAINING ZIRCONIUM NITRATE SUBSTANTIALLY FREE FROM HAFNIUM IS COLLECTED.
References Cited (Backward Citations)
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Cited
US1966729A
Cited
US2075179A
Cited
US2184943A
Cited
US2162936A
Cited
US2227833A
Cited
US2249761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-17 | 1962-05-19 | 1962-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-17 | 1966-05-19 | 1966-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-17 | 1970-05-19 | 1970-11-18 | $7700.00 | Window Closed / Lapsed |