Patent US1448036A successfully refreshed from Google Patents.
US1448036A
Expired / Lapsed
US
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Reduction of oxides of metals of the chromium group
Assignee: DURELCO Ltd
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Filing: 1921-07-12
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Granted: 1923-03-13
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Expires: 1941-07-12
Abstract
No abstract record available.
Inventors
- 👤 Pearson Richard Edgar
- 👤 Craig Eustace Neville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:09
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B11/00; C25B11/02; C25B9/00; C25B9/17; C25B9/19
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) | 1926-03-12 | 1926-09-11 | 1927-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-03-12 | 1930-09-11 | 1931-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-03-12 | 1934-09-11 | 1935-03-13 | $7700.00 | Window Closed / Lapsed |