Patent US3202481A successfully refreshed from Google Patents.
US3202481A
Expired / Lapsed
US
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Purification of nitric acid
Assignee: Union Carbide Corp
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Filing: 1962-06-04
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Granted: 1965-08-24
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Expires: 1982-06-04
Abstract
No abstract record available.
Inventors
- 👤 Howard B Bradley
- 👤 Robert G Pankhurst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:55
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/20; C01B21/38; C01B21/46; Y; Y10; Y10S; Y10S159/00; Y10S159/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A PROCESS FOR REMOVING ARSENIC, PHOSPHORUS AND SULFUR IMPURITIES FROM NITRIC ACID WHICH COMPRISES CONTACTING THE NITRIC ACID WITH AN OXIDIZING AGENT AND A MOLYBDENUM COMPOUND TO FORM HIGH-BOILING POINT OXIDIZED IMPURITY COMPOUNDS AND COMPLEX COMPOUNDS, AND SEPARATING THE HIGH-BOILINB POINT OXIDIZED IMPURITY COMPOUNDS AND COMPLEX COMPOUNDS FROM THE NITRIC ACID.
Claim 2
Dependent Claim
51 words
A PROCESS FOR REMOVING ARSENIC, PHOSPHORUS AND SULFUR IMPURITIES FROM NITRIC ACID WHICH COMPRISES CONTACTING THE NITRIC ACID WITH AN OXIDIZING AGENT AND A MOLYBDENUM COMPOUND TO FORM HIGH-BOILING POINT OXIDIZED IMPURITY COMPOUNDS AND COMPLEX COMPOUNDS, AND SEPARATING THE HIGH-BOILINB POINT OXIDIZED IMPURITY COMPOUNDS AND COMPLEX COMPOUNDS FROM THE NITRIC ACID.
References Cited (Backward Citations)
US1315354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |