US3676065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing highly concentrated nitric acid
Assignee: PINTSCHE BAMAG AG
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Filing: 1970-11-16
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Granted: 1972-07-11
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Expires: 1990-11-16
Abstract
Abstract THE INVENTION RELATES TO A METHOD OF MANUFACTURING HIGHLY CONCENTRATED NITRIC ACID, WHEREIN DILUTE NITRIC ACID IS CONCENTRATED BEYOND THE AZEOTROPIC POINT BY CHEMICAL ABSORPTION OF NITROGEN DIOXIDE, THE PRODUCT SO OBTAINED BEING SUBJECTED TO A RECTIFICATION PROCESS.
Inventors
- 👤 Gerhard Oberste-Berghaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:26
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/20; C01B21/24; C01B21/26; C01B21/38; C01B21/44
Claims Analysis
Total Claims: 0
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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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |