Patent US2556326A successfully refreshed from Google Patents.
US1292948A
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US
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Process of concentrating nitric acid and apparatus for use in connection therewith.
Assignee: EIDP Inc
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Filing: 1917-06-30
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Granted: 1919-01-28
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Expires: 1937-06-30
Abstract
No abstract record available.
Inventors
- 👤 Fred C Zeisberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:03
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/20; C01B21/38; C01B21/44; Y; Y10; Y10S; Y10S159/00; Y10S159/29
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) | 1922-01-27 | 1922-07-29 | 1923-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1926-01-27 | 1926-07-29 | 1927-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1930-01-27 | 1930-07-29 | 1931-01-28 | $7700.00 | Window Closed / Lapsed |